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Mass Effect: Invasion
by PoachedEgg reviews
In 1958, NATO and the Warsaw Pact come into contact with a hostile UFO. It seemed to defy the laws of physics with the way it moved and the way it's mass seemed to almost...fluctuate. In a joint effort, the two powers defeated the aliens, but only just. Now, the aliens have returned, and only one organization has any hope of stopping them: the Xenonauts.
Mass Effect - Rated: T - English - Sci-Fi/Mystery - Chapters: 12 - Words: 29,054 - Reviews: 23 - Favs: 96 - Follows: 141 - Updated: 2/1 - Published: 12/4/2021
by CunkToad reviews
Due to a drive core malfunction, a human vessel arrives just in time to save the Council Envoy from the yahg. What happens when humanity enters the galactic stage not as the race that got attacked by the turians for breaking a law they weren't aware of, but as the race that saved a turian platoon from certain death? M for wartime violence, pre ME1 - ME3, no OP humanity.
Mass Effect - Rated: M - English - Sci-Fi - Chapters: 125 - Words: 1,524,782 - Reviews: 929 - Favs: 1,521 - Follows: 1,599 - Updated: 1/31 - Published: 11/27/2016
by Zanarkand Kido reviews
Coming to terms with being reborn? Doable. Finding out you're in the Mass Effect universe? Slightly more difficult. I know I'm no soldier material but I want to do what I can to help save the galaxy. To that goal I will become one of the worst beings in human society. A businessman and politician. A SI/OC-story of a different kind.
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 28 - Words: 143,026 - Reviews: 1180 - Favs: 2,900 - Follows: 3,695 - Updated: 1/31 - Published: 3/21/2020
A Call to Vengeance
by Z98 reviews
The defeat of Sovereign brought reprieve, not victory, and an all too short one as new threats emerge. Amongst their victims is the Normandy, heroine of the hunt for Saren, and with the ship's destruction comes the loss of not just friends but also family. For Shepard, the mission is now one for vengeance, at any cost. Sequel to A Call to Duty.
Mass Effect - Rated: T - English - Sci-Fi/Tragedy - Chapters: 14 - Words: 101,431 - Reviews: 108 - Favs: 199 - Follows: 287 - Updated: 1/27 - Published: 11/4/2019 - Shepard
Die for the cause
by Illuviar reviews
The Citadel Council - an organization tasked with maintaining the peace, stability and prosperity of the known galaxy. It is a task they had mostly excelled at since the Krogan Rebellions. The Councilors have the weight of the galaxy upon their shoulders and have to constantly balance the needs and interests of their governments and people... Competent Council AU.
Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 33 - Words: 107,811 - Reviews: 146 - Favs: 435 - Follows: 502 - Updated: 1/19 - Published: 4/4/2019
Mass Effect: A Very Terran (Re)solution
by NihilMomentum reviews
What would happen if someone with vast knowledge about the Mass Effect Universe, both official (wiki/Codex) and theoretical (fanfics), decent fighting ability and a plan was dropped into that Universe 13 years before Eden Prime? As it turns out, quite a lot! FemShep. Soft HFY. And a very different kind of self-insert.
Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 22 - Words: 323,678 - Reviews: 681 - Favs: 1,644 - Follows: 2,039 - Updated: 1/15 - Published: 6/18/2022 - Liara T'Soni, Thane K., Mordin S., OC
Mass Effect: Isolation
by PoachedEgg reviews
What if humanity was diplomatically isolated from the Citadel races, left to fend for itself against the Batarians and other threats? This is an AU story of a humanity forced to struggle and fight for its place in the stars, with many points of divergence and some pretty significant changes made to the background lore. Contains violence and some mature themes.
Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 21 - Words: 98,419 - Reviews: 193 - Favs: 656 - Follows: 987 - Updated: 1/9 - Published: 1/17/2021
A Metal Guardian
by JawsOnYou67 reviews
The Universal Century, only a few short years ago humanity nearly eradicated itself to the tune of a madman, now it spreads, free of most of its old hatred. Yet the galaxy won't let them rest. Terminal prepares the twin Queens as best it can. (Gundam x Mass Effect)
Crossover - Gundam UC & Mass Effect - Rated: T - English - Sci-Fi/Humor - Chapters: 19 - Words: 97,089 - Reviews: 118 - Favs: 316 - Follows: 393 - Updated: 1/2 - Published: 8/18/2020 - Amuro R., Char A., Tali'Zorah, Admiral Hackett
War of the Old Ones
by Ian the Mechanic reviews
In forgotten ages past, two near eldritch forces vied for the very life essence of the Galaxy. Unknown to the young races, that war is still ongoing. how can the UNSC, the Citadel Council or the Covenant hope to stand against such forces, when they are still embroiled in their own petty squabbling? How could they hope to survive the War of the Old Ones?
Crossover - Mass Effect & Halo - Rated: M - English - Sci-Fi/Horror - Chapters: 15 - Words: 79,719 - Reviews: 93 - Favs: 183 - Follows: 273 - Updated: 1/2 - Published: 2/21/2022
The Exiles:A New Power
by Johnnieboy11 reviews
The beginning of the Battle For Earth signaled the start of the final, bloodiest campaign of the Human-Covenant War. Hastily, a plan is put into motion and an Ark Fleet, composed of a dozen Phoenix-class vessels and their escorts, makes the jump out of system. Either interference, or malfunction, causes their arrival to a new Galaxy, where new threats lurk just around the corner.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 6 - Words: 22,115 - Reviews: 130 - Favs: 518 - Follows: 789 - Updated: 12/28/2022 - Published: 12/26/2021 - OC, Tali'Zorah, Admiral Hackett, Rael'Zorah
A Galaxy of Inheritors and Usurpers
by HaloZealotDemon reviews
The Separatists destroy the Covenant in a brutal war, yet in the 2570s they persist in their efforts, but in a two years they will be gone. However The Gods have other plans. The Migrant fleet decides that they'll escape through Relay 314 to unknown space and but meet, as LTCOL Church said "Sleep-deprived Titans with negative fucks to give." Heavy AU, Rvb elements, bad swearing.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Drama - Chapters: 1 - Words: 4,788 - Reviews: 19 - Favs: 122 - Follows: 173 - Published: 12/25/2022 - Arbiter, T. Hood, Tali'Zorah, Councilor Sparatus
by KE12 reviews
AU: Humanity failed to conquer FTL, having no Eezo in Sol, but they did manage to overcome many other technologies which have allowed them to become the masters of their solar system, but what happens when the Citadel Council stumble across them in the year 3517AD? The Citadel wants their technology and Humanity wants out of Sol, but can a deal be struck? Heavy! focus on FC aspects
Mass Effect - Rated: K+ - English - Sci-Fi - Chapters: 34 - Words: 192,753 - Reviews: 615 - Favs: 1,696 - Follows: 2,293 - Updated: 12/23/2022 - Published: 4/3/2019 - [Shepard, Councilor Tevos] Benezia
Glory to the Imperium!
by V-rcingetorix reviews
Astartes Shepard has been assigned a new task: to escort strange alien civilians to a site within Imperium borders. The Emperor Renewed has issued a personal directive that preparations are to take place, an alien race seeks to destroy the peace achieved within the Imperium's holy borders. My first foray into the 40k 'verse, insight would be helpful.
Crossover - Warhammer & Mass Effect - Rated: T - English - Drama/Adventure - Chapters: 3 - Words: 28,961 - Reviews: 40 - Favs: 179 - Follows: 218 - Updated: 12/23/2022 - Published: 11/15/2021
Flesh and Metal: Book One: The Saren Incident
by DiscordantSymphony reviews
Set in an AU where the Geth came to Humanity's aide against the Turians during the First Contact War, Humanity takes a different path. But some things stay the same. Commander Shepard is put forward as the candidate for the Spectre program, he just happens to have an AI in his head. Humanity does not like Quarians, likes the Asari and Salarians and Anderson needs a drink. Or ten.
Mass Effect - Rated: M - English - Sci-Fi/Drama - Chapters: 13 - Words: 45,742 - Reviews: 73 - Favs: 216 - Follows: 311 - Updated: 12/9/2022 - Published: 8/19/2018 - Tali'Zorah, Legion, EDI, Shepard
No Greater Calling
by silencewillfall0091 reviews
Because here's the thing. Turians, despite their reputations, had never loved war- not the suffering, the dying, nor the pain. They loved victory- the prevailing of clear good over clear evil- justice winning in the end, the beating of overwhelming odds for peace. And there was never more a clear example of this type of war than ours against the Covenant.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 4 - Words: 6,957 - Reviews: 97 - Favs: 398 - Follows: 631 - Updated: 12/4/2022 - Published: 1/7/2022
by palik reviews
Our closest planet was always a mistery to us. So close yet so enigmatic, for a reason. The Exploration of mars has brought many changes in Human sociaty, none more then the discovery of an Alien Beacon filled to the brim with technology and designs never thought possible. A scared Humanity ventures into the stars to carve out is own place in the galaxy. (Slight HFY, maybe not)
Crossover - Star Wars & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 14 - Words: 24,468 - Reviews: 153 - Favs: 492 - Follows: 631 - Updated: 12/3/2022 - Published: 7/2/2021
by DragonKnight374 reviews
What if more than the world of Coda was isolated in space time? What will the freelancers do when they realize there’s more to the universe than their little planet, and how will the citadel react, to the Anthem of Creation?
Crossover - Mass Effect & Anthem - Rated: M - English - Sci-Fi/Adventure - Chapters: 14 - Words: 70,075 - Reviews: 60 - Favs: 225 - Follows: 277 - Updated: 12/1/2022 - Published: 8/8/2022
Glory to the Ones Who Look Forward
by atomicsub927 reviews
The 26th Century Dawns over a united humanity as it expands across the Attican traverse. A First Contact novelization of an alternate humanity. Worthy of being called a Galactic Power. Glory to those who look forward! Glory to those who push forward!
Mass Effect - Rated: M - English - Sci-Fi/Drama - Chapters: 7 - Words: 21,531 - Reviews: 37 - Favs: 138 - Follows: 240 - Updated: 12/1/2022 - Published: 8/11/2022
A few Titans Solves Many Issues, Including the Reapers
by vmoneywashere reviews
In a distant yet expansive corner of the galaxy, many races rose and fell without anyone noticing. Yet a collection survived their ordeals and now look outwards. They bring Ideals, Peace, Prosperity, all under the UNSA and its Custodianship. When the Quarian Migrant fleet encounters an Expedition fleet, the nomads find a new home and a new family. (more updates in the winters) HFY
Crossover - Mass Effect & Stellaris - Rated: T - English - Sci-Fi/Family - Chapters: 18 - Words: 74,830 - Reviews: 191 - Favs: 617 - Follows: 870 - Updated: 11/10/2022 - Published: 11/16/2021 - [Tali'Zorah, Shepard] Rael'Zorah, OC
Terran Federation: Counterstrike
by L4 of the WEST reviews
It's been 8 years since the end of the 2nd Bug war. Humanity is starting to enter its golden age in the galactic stage, with technology no one can replicate, with allies that no one has accepted, and a military capable of taking on any competitor it seems. But that will change, those who employ chains are circling like wolves, and an enemy thought dead return
Crossover - Starship Troopers & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 20 - Words: 148,356 - Reviews: 169 - Favs: 601 - Follows: 649 - Updated: 9/22/2022 - Published: 2/16/2017
A Change of Fate
by kaln7 reviews
The Colonials search for the Thirteenth tribe after the fall of their colonies maybe at an end, when they make contact with the Systems Alliance, but will Earth lend them a hand or will the Cylons destroy them all.
Crossover - Battlestar Galactica: 2003 & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 16 - Words: 107,692 - Reviews: 208 - Favs: 390 - Follows: 552 - Updated: 9/12/2022 - Published: 4/8/2017
The Ghoul Effect
by storyseeker7 reviews
Humans and Ghouls two species who by natures design should have destroyed one or the other in bloody war of survive. But the actions of a few mange prevent such an event from occurring, and now two species work together for a better future. How will they react to a galaxy for of different races, and how will the galaxy react to the unique relationship between these two races?
Crossover - Mass Effect & Tokyo Ghoul/東京喰種トーキョーグール - Rated: M - English - Sci-Fi - Chapters: 30 - Words: 262,551 - Reviews: 245 - Favs: 596 - Follows: 692 - Updated: 7/22/2022 - Published: 1/2/2019 - Complete
Adversor Et Admorsus
by PhoinexFire reviews
An ancient battle millennium old will soon begin again, forces of a dark order shall face an Empire of Light. Nations caught in the middle must choose and the future shall be shaped in the stars. Peace shall reign in the end, whether it comes in darkness or arises in light. One way or the other the darkness shall come and face the Terran Star Imperium. Sequel to Britannia Rising.
Crossover - Code Geass & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 10 - Words: 82,418 - Reviews: 145 - Favs: 438 - Follows: 594 - Updated: 7/16/2022 - Published: 5/13/2020 - [Lelouch L., C.C.]
by Omniscent1 reviews
A crossover between Mass Effect and Cthulhutech. Humanity has won the Aeon War and has since expanded and thrived. How will the galaxy fare with this new power?
Crossover - Cthulhu Mythos & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 25 - Words: 192,840 - Reviews: 1679 - Favs: 4,646 - Follows: 5,389 - Updated: 7/9/2022 - Published: 6/5/2013 - Saren A., Shepard, OC
Belli Dura Despicio: I Despise the Hard Knocks of War
by grimreaper's lost soul reviews
Deployed to patrol the Turian Fringe Systems the HNV Invictus is badly damaged and is forced to blind-jump with a damaged FTL drive, it's crew survived the ordeal, landing on 'humanity's doorstep the crew is rescued and the Invictus is scuttled, Humanity learning of the Hierarchy moves to put its best foot forward by bringing their wayward sons and daughters home. Alternate FC Fic.
Mass Effect - Rated: M - English - Sci-Fi/Drama - Chapters: 17 - Words: 68,902 - Reviews: 220 - Favs: 730 - Follows: 946 - Updated: 7/8/2022 - Published: 7/3/2019 - Admiral Hackett, Shepard, Councilor Sparatus, OC
The Halo Effect: War and Civilization
by free man writer reviews
A crossover years in the works. Civilizations rise and fall but to those that do stand, they prosper. They Expand. They reach out across the stars. But of course, such is a Universal law, War is never far behind. War is a language all civilized races speak and it is war most are familiar with. Co-written with BulletStormX. Halo/Mass Effect with a dash of Star Wars.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 13 - Words: 127,353 - Reviews: 368 - Favs: 771 - Follows: 1,008 - Updated: 7/4/2022 - Published: 7/28/2020
HALO Mass convergence
by SapphireDawn11709 reviews
Two Universe collide after the Forerunners fall and the Reapers return, will the two branches of Humanity placed in their respective Systems by a Forerunner Monitor unite or fall, only time will tell in this epic clash. When the UNSC Exploration and Research Vessel Light of Sol discover a strange artifact, they are opened up to the rest of the Galaxy after millennia of isolation.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 24 - Words: 82,670 - Reviews: 323 - Favs: 745 - Follows: 932 - Updated: 7/4/2022 - Published: 9/18/2016 - Master Chief/John-117, Cortana, J. Garson, Tali'Zorah
by CruxMDQ reviews
A youthful lieutenant Shepard unknowingly facilitates the release of an ancient evil and sets in motion a chain of events that will greatly influence the outcome of the first contact with Citadel species - and potentially threaten the standing of humanity among them. (Contributions: BrokenLifeCycle, kishinokurobi, kyro2009)
Crossover - Mass Effect & Overwatch - Rated: T - English - Adventure/Sci-Fi - Chapters: 65 - Words: 360,142 - Reviews: 172 - Favs: 310 - Follows: 369 - Updated: 6/28/2022 - Published: 6/29/2016 - Shepard, Amélie L./Widowmaker, Lena O./Tracer, G. Reyes/Reaper
Aggressor: Rise of Man
by M.B.Liddle reviews
Mankind endures. Twice have alien invaders attempted to force humanity into extinction. Twice they have failed. Now, an uneasy peace covers the galaxy as enemies both ancient and new slumber, or pace beyond the walls. The balance is about to tip. A discovery has been made on a Human colony, faces familiar yet strange move against them, and in the middle of it all, a name. Shepard.
Crossover - Mass Effect & Resistance: Fall of Man - Rated: T - English - Sci-Fi/Horror - Chapters: 11 - Words: 66,698 - Reviews: 61 - Favs: 71 - Follows: 95 - Updated: 6/16/2022 - Published: 3/31/2022
Mass Effect: The Iron Heart of Man
by Apollonir reviews
[AU] The Illusive Man said that salvation comes with a cost. When corruption seeps into the galaxy, when centuries of status quo suddenly breaks in a mere decade, when blood's spilled among the stars like never before, when extinction looms over civilization, when morality is merely a shade... salvation can only come with sacrifice. [AU First Contact War & Reaper War; GRAPHIC]
Mass Effect - Rated: M - English - Sci-Fi/Suspense - Chapters: 37 - Words: 389,709 - Reviews: 932 - Favs: 2,054 - Follows: 2,430 - Updated: 5/28/2022 - Published: 8/23/2016 - Admiral Hackett, Illusive Man, Shepard, OC
Mass Effect: The Great War
by Mister Smallville reviews
The Citadel Council and the Turian Hierarchy has been at war for a good half of a century. Eager to break the stalemate, The Hierarchy seeks out a new ally in a rising Systems Alliance, bringing the war back to full speed. The Alliance now goes through it's trial by fire, as it emerges from obscurity into the galactic stage. (AU no Krogan Rebellions/First Contact Wars)
Mass Effect - Rated: M - English - Sci-Fi - Chapters: 52 - Words: 164,044 - Reviews: 397 - Favs: 656 - Follows: 892 - Updated: 5/20/2022 - Published: 1/25/2017
Mass Effect: Orion's Hunt
by TallYapflip reviews
The Prothean Archives on Mars were corrupted, only scraps of data remaining. What little was left led to the single largest effort in Human history. This endeavor saw a colonial flotilla and millions of souls stranded a galaxy away from home. Two centuries later, a new nation far from Earth begins reaching for the stars in search of their old home.
Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 4 - Words: 22,292 - Reviews: 65 - Favs: 270 - Follows: 385 - Updated: 4/23/2022 - Published: 10/1/2021 - [Liara T'Soni, Shepard] Miranda L., OC
Half Life: Entanglement
by ThePilotArchangel reviews
Ayita Shephard, Lambda Resistance; Cato'Zorah nar Rayya, hired Quarian of the Council Funded Relay 314 Expedition. Both dissatisfied with their lot in this universe; one under the heel of a Inter-Universal Empire, and the other under the boot of an Apathetic Galactic Council. Together they will change the Galaxy. (Image not Owned, Co-Written with IantheMechanic, First Contact AU)
Crossover - Half-Life & Mass Effect - Rated: T - English - Sci-Fi/Family - Chapters: 34 - Words: 285,971 - Reviews: 28 - Favs: 92 - Follows: 125 - Updated: 4/2/2022 - Published: 6/30/2020 - [Shepard, OC] Garrus V., Tali'Zorah
by V-rcingetorix reviews
Humanity discovered the Ruins over Forty years earlier than they should have. After the First Contact War, they have earned the respect of the galaxy and are respected as equals. But Shepard, survivor of Mindoir, stumbles onto a secret spanning through the millenia, and now the Powers want to control his discovery. Alternate Universe, see Early Discovery for the Backstory.
Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 37 - Words: 368,927 - Reviews: 262 - Favs: 648 - Follows: 751 - Updated: 3/28/2022 - Published: 8/21/2015 - Garrus V., Ashley W., Liara T'Soni, Shepard
Bloody Path Through the Stars
by RandomSortaWriter reviews
AU, ME1. Main changes are to humanities biology. Same universe as 'Bloody Path to the Stars'. After coming onto the galactic scene in a short but bloody war, Humanity has a meteoric rise. Now another hurdle is being jumped. A human is being seriously considered as a possible spectre, but this human will be more important than anyone realizes.
Mass Effect - Rated: M - English - Adventure - Chapters: 6 - Words: 49,560 - Reviews: 20 - Favs: 61 - Follows: 99 - Updated: 3/27/2022 - Published: 6/15/2021 - Shepard
by Fade Maybe reviews
Through ONI's manipulation, the UNSC stumbles upon a Mass Relay and is dragged into a new war. They'll discover the battered races of the Citadel, the political intrigue of its factions, and a second group of humans governed by the Systems Alliance, divided by Cerberus, and lead by Commander Shepard. Yet no one can stop what is to come: the Reclamation, and the death of the galaxy.
Crossover - Halo & Mass Effect - Rated: T - English - Drama/Suspense - Chapters: 54 - Words: 407,208 - Reviews: 1652 - Favs: 1,778 - Follows: 2,207 - Updated: 3/21/2022 - Published: 3/13/2013
The Foreign Ship
by ImperatorAurelian reviews
AU. It was just supposed to be a routine patrol, open a Mass Relay survey the system and report anything useful. Instead of finding a garden world or a deposit of Element Zero or Metals instead, they found a ship that no one recognises and a huge headache and technology which will change the Systems Alliance and humanity forever.
Mass Effect - Rated: T - English - Adventure/Suspense - Chapters: 10 - Words: 30,778 - Reviews: 129 - Favs: 270 - Follows: 370 - Updated: 3/17/2022 - Published: 10/16/2021
Lost Son of Terra Phoenix
by Ares007 reviews
For eons past, they enjoyed the harvest of their farms. Countless civilizations breathed life because they allowed it. Now, they will die because he demands it. Halo/Mass Effect but with heavy elements from Warhammer 40k. M-Shep/Miranda, OC/Liara. HFY
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Romance - Chapters: 10 - Words: 62,084 - Reviews: 40 - Favs: 137 - Follows: 177 - Updated: 3/14/2022 - Published: 11/29/2021 - [SPARTAN-B312/Noble Six, Oriana L.]
A Divided Earth: The First War
by TheConeezeanEmperor reviews
HMS Isaac Newton and HMS Alexander Fleming open the Shanxi Relay. This has made a lot of people very angry and has been widely regarded as a bad move. The following course of events would lead to Humanity's first hot war in over a century, a war which could have exploded into full on Interspecies Total War, assuming of course the various human nations could even agree on anything.
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 15 - Words: 121,498 - Reviews: 70 - Favs: 186 - Follows: 276 - Updated: 3/12/2022 - Published: 7/20/2021 - Admiral Hackett, Saren A., Illusive Man, Councilor Tevos
The End of Eternity: Rise of the Terran Alliance
by Icarus636 reviews
No Gods, No Kings REWRITTEN: Through intervention the dream of Rapture never became a nightmare, instead new technologies and beliefs pave the way for Humanity to unite as one and seek a new future among the stars. The Council finds itself confronting a civilization that has surpassed every technological shackle and overcame every obstacle thrown their way: The Terran Alliance.
Crossover - Mass Effect & BioShock - Rated: T - English - Sci-Fi/Mystery - Chapters: 20 - Words: 233,230 - Reviews: 318 - Favs: 1,237 - Follows: 1,583 - Updated: 2/28/2022 - Published: 8/6/2019 - Tali'Zorah, Shepard, Eleanor L., Elizabeth
On the Illusion of Might
by evevee reviews
We thought ourselves powerful, able to conquer a galaxy with nothing but toys. When we overcame every challenge, breached the space between the galaxies themselves, what use were the words of a race ashamed of their own past? Yet we cannot deny that we were warned, for while a challenge to a human is laughable, a challenge to humanity is a death sentence.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 26 - Words: 287,962 - Reviews: 1997 - Favs: 3,704 - Follows: 4,685 - Updated: 2/21/2022 - Published: 2/21/2017 - Master Chief/John-117, Cortana, Garrus V., Shepard
The Gathering Darkness
by Pyromancer707 reviews
Mass Effect AU. The Systems Alliance never existed, instead the Terran Federation rose from the ashes of the third World War in the 2050s with the aid of AI and cybernetic technology resulting in a 25 year cold war with the Citadel Council after the First Contact War. But as tensions begin to ease the dark shadow of the Reapers looms...
Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 4 - Words: 22,958 - Reviews: 31 - Favs: 108 - Follows: 150 - Updated: 1/16/2022 - Published: 11/17/2021 - Garrus V., Ashley W., Joker, Shepard
by Beastrider9 reviews
All life on Earth had been consumed by Blacklight. With no Biomass to feed on, Blacklight had to evolve, adapt, and grow. Now a collective Council of Aliens discovers the existence of such a life form. How do the aliens see a form of life that is viral, how they deal with it, what are the consequences to the galaxy of such a race existing at all.
Crossover - Mass Effect & Prototype - Rated: M - English - Sci-Fi - Chapters: 64 - Words: 345,885 - Reviews: 2928 - Favs: 4,513 - Follows: 4,962 - Updated: 1/1/2022 - Published: 8/8/2014
It Started At Shanxi
by SpaceTurtleOX reviews
Fifty years after the end of the Human-Covenant War an ill-fated UNSC expedition opens Relay 314, revealing a civilization unprepared for their arrival, and relics from a terrible past.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 16 - Words: 81,162 - Reviews: 565 - Favs: 1,743 - Follows: 2,616 - Updated: 12/27/2021 - Published: 7/26/2019 - Master Chief/John-117, Cortana, Zaeed M., OC
by CypherTails reviews
The Quarians are on the run, the Batarians hot on their heels. Their race, an offering as a show of power. They flee to the one place they think the Batarian's won't follow, Sol. The grave of the Turian third fleet and a hundred thousand Turian lives. There young Tali will meet John and Jane Shepard and learn of the truth behind the Human's self-imposed isolation.
Mass Effect - Rated: T - English - Adventure/Romance - Chapters: 6 - Words: 15,998 - Reviews: 40 - Favs: 263 - Follows: 369 - Updated: 12/10/2021 - Published: 12/6/2021 - [Shepard, Tali'Zorah]
Mass Effect: Trailblazer
by TallYapflip reviews
Humanity, left to its own devices for centuries, comes into contact with the Citadel Council. A misunderstanding leads to hostile first contact, and the UNSC is drawn into war with the Council shortly after the Insurrection's height. The Council finds itself face-to-face with a species that has broken the shackles of Mass Effect Technology. The Era of Humanity has only just begun.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 15 - Words: 73,932 - Reviews: 726 - Favs: 2,506 - Follows: 3,317 - Updated: 11/27/2021 - Published: 7/14/2017 - Master Chief/John-117, J. Keyes, Miranda L., Shepard
Gundam SEED: The League Crisis
by Tristraim reviews
With the the Second Valentine War a distant memory, a revenant from the past, armed with technology far beyond, has come as a final obstacle to the future. GSDxME, pre-First Contact War.. Canon pairings.
Crossover - Gundam Seed & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 3 - Words: 9,501 - Reviews: 12 - Favs: 37 - Follows: 51 - Updated: 11/21/2021 - Published: 11/12/2021 - Kira Y., Lacus C., Hannah S.
by Minimalist.Musings reviews
AU. A world where Humanity was unified by a clique of scientists and engineers. Society has evolved alongside massive investments in technology and expansion that harnesses the inherent need for Humanity to grow and push at the frontiers. What happens when a technologically and politically coherent Humanity predict the existence of and finally meet the other species in the Galaxy?
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 8 - Words: 6,130 - Reviews: 14 - Favs: 129 - Follows: 186 - Updated: 11/12/2021 - Published: 10/28/2021
Imperium Effect: Terra Rising
by Deathwatch Razgriz reviews
The long awaited sequel to UNSC Pheonix Rising. The fledgling Empire has survived it's birthpains, and now looks to the stars to rebuild what was once theirs...
Crossover - Warhammer & Mass Effect - Rated: M - English - Humor/Sci-Fi - Chapters: 17 - Words: 87,590 - Reviews: 322 - Favs: 485 - Follows: 605 - Updated: 11/8/2021 - Published: 8/4/2017
For Earth and All Her Colonies
by GADPELLAEON reviews
Post Human-Covenant War AU. After the Great War, all the UNSC wants to do is rebuild and live in the peace. A peace that so many died for. What happens when they learn that no matter what, war will always find them. Chapters Updated - Chapter 11 uploaded (07/08/2019) Any criticism and/or tips welcome.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 13 - Words: 80,854 - Reviews: 512 - Favs: 1,604 - Follows: 2,234 - Updated: 10/14/2021 - Published: 12/27/2018 - Master Chief/John-117, Arbiter, J. Garson, Councilor Tevos
The Solar Research Council
by Minimalist.Musings reviews
Humanity was unified by the Pluto Research Council, a forward-looking nation-state dedicated to the advancement of the species via relentless pursuit of knowledge and development. With the discovery of the Charon relay, how will the Scientific Principle guide Humanity into the future? (Updated: Book 1 Chapter 1)
Mass Effect - Rated: K+ - English - Sci-Fi - Chapters: 32 - Words: 59,900 - Reviews: 210 - Favs: 714 - Follows: 959 - Updated: 10/12/2021 - Published: 1/15/2021
XCOM: Enemy Expanded
by DarthHollow reviews
We defeated the Elders. We took their technology and made it our own to advance into the stars. After so long we surprisingly made allies while unsurprisingly made enemies. Now we find our place and stand firm in this galaxy. Pray to those that believe us weak. For we will not.
Crossover - X-Com & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 8 - Words: 41,066 - Reviews: 53 - Favs: 245 - Follows: 375 - Updated: 9/8/2021 - Published: 8/6/2020
Soon, everyone will hear the screams
by magkiln reviews
The Citadel Council doesn't want another conflict. Their reputation rests on their ability to maintain the peace. The Alliance of United Systems doesn't want another conflict. They won the last one, no need to risk spoiling their record. Shepard doesn't want another conflict. The last one was ugly enough. Unfortunately, it seems that some people didn't get the memo.
Crossover - Aliens/Predator & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 37 - Words: 164,619 - Reviews: 524 - Favs: 659 - Follows: 790 - Updated: 8/14/2021 - Published: 1/31/2018 - Predator/Yautja, Alien/Xenomorph, Saren A., Shepard
Mass Effect: End of Days
by Postmeat reviews
An ancient danger threatens the galaxy, unknown to all. A humanity which never discovered Prothean ruins, expanding through space on their own, emerges. Joined with the machines they created, hardened by war with a terrifying enemy, they read the writing on the wall. But will the galactic community already there listen to these newcomers, stirring up trouble everywhere they go?
Mass Effect - Rated: T - English - Sci-Fi/Suspense - Chapters: 20 - Words: 234,080 - Reviews: 739 - Favs: 2,897 - Follows: 3,510 - Updated: 8/1/2021 - Published: 3/8/2015 - Admiral Hackett, Shadow Broker, Shepard, Rachni Queen
The Lost Civilization
by Apollonir reviews
After the Battle of the Ark, a UNSC Pelican dropship crash lands on Thessia. Two ODSTs survive the crash and make contact with primitive Asari. Ninety thousand years later, Liara T'Soni discovers a strange looking aircraft and Human remains in an ancient cave burial chamber. The discovery she makes will take the Asari on a journey to discover their true lineage.
Crossover - Halo & Mass Effect - Rated: T - English - Mystery/Suspense - Chapters: 16 - Words: 33,722 - Reviews: 667 - Favs: 1,977 - Follows: 2,768 - Updated: 7/26/2021 - Published: 7/2/2017 - Ashley W., Liara T'Soni, Mordin S., Shepard
The Fifth Option
by RetardedMoth reviews
A more shrewd Sole Survivor rejects the paths laid out to them by the factions of Boston. Choosing a fifth option, they unite the Commonwealth as one. Now, years later, a unified humanity reaches for the stars. The Citadel and its people will have to adapt to these strange newcomers, and their weird technologies.
Crossover - Fallout & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 7 - Words: 26,974 - Reviews: 40 - Favs: 332 - Follows: 489 - Updated: 7/18/2021 - Published: 6/21/2021
Alternate Imperium: First Contact
by CSNightFury reviews
Beset on all sides, the Imperium can ill afford yet another front to divert troops to. The Council races have lived in relative peace for over a thousand years. But when a council fleet stumbles across an imperial world, all bets are off. (AU Warhammer 40k, AU First Contact, fusion, probably HFY, probably HWTF, definitely heretical)
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 2 - Words: 7,435 - Reviews: 69 - Favs: 200 - Follows: 327 - Updated: 6/9/2021 - Published: 5/30/2021
United we Stand
by Mayto reviews
At the height of the Human Covenant war, another galactic power intervenes to aid the embattled humans. Standing side by side with the Turians, the UNSC prepares for a new phase of the Human Covenant war.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 86 - Words: 308,563 - Reviews: 1461 - Favs: 1,334 - Follows: 1,614 - Updated: 6/6/2021 - Published: 3/26/2019
The Horizons Beyond
by JJ2161 reviews
When two worlds with predefined mindsets, knowledge, and ideals have to throw all of that out the window after contacting a new player. Humanity. (Babylon 5/Mass Effect AU crossover with a Star Trek-based Humanity and Stargate-based Precursors)
Crossover - Babylon 5 & Mass Effect - Rated: T - English - Chapters: 19 - Words: 163,996 - Reviews: 326 - Favs: 610 - Follows: 736 - Updated: 5/10/2021 - Published: 9/29/2017
The Children of Humanity: Kino's Journey
by Dairene reviews
Over two centuries after the Union's Ambrian Traverse Expedition secretly left for the Large Magellan Cloud, Kino-221 is among a number of scouts dispatched in an attempt to discern the situation in the Milky Way... Sequel spin-off of Children of Humanity
Crossover - Mass Effect & Nier - Rated: M - English - Chapters: 2 - Words: 2,635 - Reviews: 2 - Favs: 10 - Follows: 16 - Updated: 5/10/2021 - Published: 4/20/2021
by averagecitydude reviews
Senator Simon Moreno is sent to the Citadel as part of an official visit from the Commonwealth. Little did he know that news of the Commonwealth had already elicited some odd reactions amongst the Citadel species, particularly the Turians. Sequel to 'The Address'.
Crossover - Mass Effect & Stellaris - Rated: K+ - English - Sci-Fi - Chapters: 1 - Words: 4,070 - Reviews: 7 - Favs: 81 - Follows: 52 - Published: 4/15/2021 - Councilor Valern, Councilor Tevos, Councilor Sparatus - Complete
From the Ashes
by erttheking reviews
Even after seeing their world burned, Humanity was able to stand up again, and push beyond their pre-war status and reach the heavens. But how will a hardened Humanity handle life among the stars? And how will others react to this aggressive newcomer?
Crossover - Fallout & Mass Effect - Rated: T - English - Sci-Fi/Romance - Chapters: 119 - Words: 922,627 - Reviews: 3594 - Favs: 3,302 - Follows: 3,119 - Updated: 4/13/2021 - Published: 5/17/2012
by averagecitydude reviews
Sent with a delegation to represent the Citadel Council, Councillor Tevos has her eyes opened to a much more powerful and larger community, making her rethink how the Council has functioned for centuries. Along the way, she meets a prominent human diplomat.
Crossover - Mass Effect & Stellaris - Rated: K+ - English - Sci-Fi - Chapters: 1 - Words: 3,763 - Reviews: 10 - Favs: 104 - Follows: 76 - Published: 4/12/2021 - Councilor Tevos - Complete
The Sum is Greater than its Parts
by Maersikai reviews
Having long since combined forces, a fleet of the Humans and Covenants finest are torn from the universe they know to be thrown in to a strange and desolate reality. They will strive to uphold the Mantle against the Mass Effect's most Ancient Enemy. Will they break the cycle?
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 20 - Words: 181,741 - Reviews: 412 - Favs: 1,204 - Follows: 1,426 - Updated: 4/8/2021 - Published: 3/2/2015 - Cortana, J. Garson
War, Peace, and other Galactic Customs
by The Almighty Afroduck reviews
After a long, terrible war, the Federation of Sovereign Empires forms as the product of the alliance created early in the Great War between the Covenant Separatists and the UNSC. Time passes as they progress greatly, eventually discovering the existence of other galactic governments. The events that will follow will change the course of the galaxy in more ways than one. PART- 3
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 36 - Words: 402,465 - Reviews: 758 - Favs: 1,348 - Follows: 1,629 - Updated: 3/7/2021 - Published: 3/1/2014
by Solaris242 reviews
Humanity never developed FTL. The Prothean archives contained no technology, no Element Zero, just a warning. Isolated from the rest of the galaxy for two thousand years, restricted to their only system, how will humanity have changed when they first meet the Turians? AU, alternate history of humanity and First Contact.
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 27 - Words: 79,685 - Reviews: 2954 - Favs: 8,395 - Follows: 8,725 - Updated: 2/16/2021 - Published: 5/7/2013 - Complete
by GreaterGoodIreland reviews
The end of the Eden Prime War saw the liberation of Rannoch, humans on the Council, the revelation of the Reapers to the galaxy... and the 'assassination' of Shepard. Two years later, the Reapers still have not returned, the galaxy is on the brink of war yet again, and Cerberus knows more than it should. - AU ME2 with the background of Battlefield 2142 - HFY -
Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 9 - Words: 45,643 - Reviews: 69 - Favs: 173 - Follows: 198 - Updated: 2/6/2021 - Published: 11/8/2017 - [Liara T'Soni, Shepard] OC
by BattleUnit3 reviews
They studied Organics. All they ever saw was fear from Sentient Synthetics. Geth had no place in their world. But by chance they discovered a species on the brink of extinction. They worked along side their creations as equals. They didn't care who or what you are. They only cared about their City.
Crossover - Mass Effect & Frostpunk - Rated: T - English - Adventure - Chapters: 15 - Words: 33,405 - Reviews: 465 - Favs: 1,161 - Follows: 1,555 - Updated: 2/5/2021 - Published: 5/17/2018
Mass Effect: Per Tenebras Lux
by SamiKamii reviews
What happens if Humanity never discovered the Prothean Archives until after they had achieved FTL. What happens when a Turian Spectre Garrus Vakarian leads a search for a weapon against the Reapers. Will Humanity help the Council and save the galaxy? Or will it let the cycle continue? A/U, OP!Humanity, FemShep, Inspiration taken from several universes.
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 1 - Words: 1,779 - Reviews: 16 - Favs: 151 - Follows: 238 - Published: 1/26/2021 - [Shepard, Samantha T.] Garrus V., Miranda L.
by mp3.1415player reviews
Technological incompatibility can cause serious issues even at a simple level. When it comes to interstellar travel, those issues can be quite profound...
Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 16 - Words: 127,546 - Reviews: 919 - Favs: 3,656 - Follows: 4,248 - Updated: 1/5/2021 - Published: 8/18/2019
The Spirit of Humanity
by Kazlin reviews
After decades of ponderous travel through space the UNSC Spirit of Fire stumbles across the drifting tomb of Humanities greatest hero. Within the ship they find the means of possibly making it home, but to get there they will have to make alliances that could upend the balance of power in the Galaxy and change everything the Council races thought true.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 5 - Words: 20,227 - Reviews: 202 - Favs: 852 - Follows: 1,331 - Updated: 1/5/2021 - Published: 5/24/2018
The Day the Arms Closed
by My Nips Hurt reviews
Humanity, as a whole, has been deemed 'too violent' as a species to be permitted within the Citadel and Council-controlled space. Follow those who dwell within as civil uprisings and chaos spread across a once-peaceful and grand Citadel.
Mass Effect - Rated: T - English - Sci-Fi/Drama - Chapters: 15 - Words: 46,463 - Reviews: 256 - Favs: 615 - Follows: 712 - Updated: 12/28/2020 - Published: 6/21/2011
Semper Vigilo: Anthologies
by CunkToad reviews
A series of short stories set in the Semper Vigilo Universe. Rated M for wartime violence. Latest story: 'Xeno Noir' by AdmiralSakai Two years after Sovereign's attack, a series of grisly murders in the turian community on Eden Prime lead an honest cop to facts the HSA would rather not see exposed.
Mass Effect - Rated: M - English - Sci-Fi - Chapters: 3 - Words: 56,675 - Reviews: 6 - Favs: 37 - Follows: 19 - Updated: 12/24/2020 - Published: 12/23/2018
A House Divided Amongst Itself
by ThePilotArchangel reviews
First Contact AU! The United Confederacy explores the Orion arm of the milky way galaxy, unaware of the rest of galactic civilization. When mankind meets its first aliens, how will things unfold? How will mankind react? (DISCONTINUED, Spiritual Successor Story 'Pax Britannia' Coming soon)
Mass Effect - Rated: T - English - Chapters: 33 - Words: 120,795 - Reviews: 368 - Favs: 504 - Follows: 671 - Updated: 12/20/2020 - Published: 4/17/2019 - Hannah S., Rael'Zorah, OC
The Fourth Council Race
by Knight Vigilant Koren reviews
A few minor and realistic changes in the decisions made by the leaders of humanity drastically altered the path of Citadel Space and the Reaper War. This is the story of caution and planning over recklessness, the path of the juggernaut over the glass cannon. This is the story of humanity as it should have been. A power worthy of its Council seat, and one the Reapers can't ignore.
Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 29 - Words: 195,149 - Reviews: 1466 - Favs: 2,671 - Follows: 3,416 - Updated: 11/27/2020 - Published: 9/23/2017 - Garrus V., Kaidan A., Shepard, Councilor Irissa
The Next Great Journey: Awakening
by alanvaladez reviews
The Reaper's return was delayed; colonists are disappearing, and mysterious incidents are happening at random colonies all over the Galaxy. Are the two surviving Reapers of the battle of the Citadel behind this events? Or is it someone else? The SPECTRES, CERBERUS and the Alliance will have to find out and put an end to this. The sequel to The Next Great Journey. Discontinued.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Drama - Chapters: 9 - Words: 85,340 - Reviews: 21 - Favs: 146 - Follows: 178 - Updated: 10/28/2020 - Published: 10/30/2016 - Master Chief/John-117, OC, Saren A., OC
An everlasting nightmare
by MakeMeOneWithEverything reviews
Humanity's ascent into the stars has brought a new era of culture, politics, economics and war. With the sudden expansion of a new empire, it was perhaps inevitable that it would face conflict with the old established empire of the Turian Hierarchy, and bring about wanton chaos that the human race and the galaxy had not seen in centuries.
Mass Effect - Rated: M - English - Sci-Fi - Chapters: 2 - Words: 11,407 - Reviews: 9 - Favs: 21 - Follows: 34 - Updated: 9/25/2020 - Published: 8/28/2020 - D. Anderson, Admiral Hackett, Councilor Tevos, D. Udina
Mass Effect: The Terran Gambit
by informedterran reviews
AU: A quickly advancing Humanity discovers early on the fate of the ancient Protheans and the threat of the Reapers. Instead of exploring the galaxy with wonder and optimism, the leaders of the Terran Nation prepare their young race to save themselves. When they finally make First Contact, they begin their ultimate gambit; To ready all the galaxy to fight the Reapers!
Mass Effect - Rated: M - English - Sci-Fi - Chapters: 40 - Words: 511,902 - Reviews: 341 - Favs: 1,234 - Follows: 1,416 - Updated: 9/6/2020 - Published: 4/16/2016 - OC
Dawn of Titans
by F13D reviews
There is nothing fair, just, or honorable about war. There is only winning and losing, the living and the dead. Humanity has learned this truth and has ascended to the stars. What effect will this have on the rest of the galaxy, one that has experienced millennia of peace? Will it be able to maintain the peace or will it be ushered into a new age of war? Let the end begin. A/U
Crossover - Mass Effect & EndWar - Rated: M - English - Sci-Fi/Adventure - Chapters: 36 - Words: 374,936 - Reviews: 720 - Favs: 1,069 - Follows: 1,285 - Updated: 8/21/2020 - Published: 7/15/2015 - D. Anderson, Admiral Hackett, OC
Mass Effect: Children of the Moons
by OmegaEntertainment reviews
"Humanity always knew, when we looked to the stars, that there could be an apex predator out there. However, while we knew that those predators could find us at the heart of our civilization, we could have never predicted that they would offer us Preservation." Rated M for Necromorphs and Brethren Moons, no other reason is needed for the rating.
Crossover - Mass Effect & Dead Space - Rated: M - English - Sci-Fi/Horror - Chapters: 13 - Words: 49,281 - Reviews: 115 - Favs: 493 - Follows: 582 - Updated: 8/7/2020 - Published: 12/11/2017 - Harbinger, Shepard, Isaac C., OC
Mass Effect: Skynet
by Wanderer101 reviews
To combat a brutal communist regime emerging from the ashes of the Soviet Union the United States builds an AI to give them an edge. Little do they know this edge may be enough to help them defeat an ancient evil.
Crossover - Terminator & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 2 - Words: 8,978 - Reviews: 96 - Favs: 516 - Follows: 699 - Updated: 6/6/2020 - Published: 3/9/2020
The False War
by DerelictTyrant reviews
Hundreds of years can make a difference on the galactic scene; a violation of Council Law too. Ideals and agendas clash, as a different mankind and the galaxy meet each other. Old alliances are put to test and new pacts are forged, while the definitions of friend and foe become blurred. Alternate Universe.
Mass Effect - Rated: M - English - Sci-Fi/Suspense - Chapters: 27 - Words: 195,884 - Reviews: 116 - Favs: 272 - Follows: 321 - Updated: 6/5/2020 - Published: 1/28/2017 - Admiral Hackett, Illusive Man, Councilor Irissa, OC
Unknown: Everything Will Change
by Black Shield INC reviews
In the year 2556 the small yet prospering U.N.S.C colony world of Shanxi is attacked by an unknown species. The events that followed will change everything for both the U.N.S.C and their Allies. I do not own Halo or Mass Effect both games belong to there respective owners. Chapters 1-9 are undergoing rework.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 10 - Words: 67,445 - Reviews: 102 - Favs: 331 - Follows: 482 - Updated: 6/4/2020 - Published: 10/11/2014 - E. Buck, Rookie, Saren A., Shepard
by ecarden reviews
The obligatory Mass Effect-XCOM crossover, just set a little earlier than most. The Migrant Fleet is looking for new worlds, new tech, new allies. Humanity would very much like to not be exterminated by aliens from beyond the stars. SYNERGY!
Crossover - X-Com & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 18 - Words: 126,651 - Reviews: 143 - Favs: 452 - Follows: 607 - Updated: 4/23/2020 - Published: 6/15/2017 - U. Wrex, Tali'Zorah, Joker, Shepard
by macroVAC reviews
The story of Mass Effect, while an excellent space opera, never took full advantage of the capabilities of its setting. Let's fix that, the stars will move, and the galaxy will tremble! No force, neither stagnant, galactic ascendancies nor ageless mechanical monstrosities will stand in the way of the future's implacable march… For better or worse.
Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 3 - Words: 12,452 - Reviews: 28 - Favs: 129 - Follows: 197 - Updated: 4/7/2020 - Published: 11/24/2019
by TallYapflip reviews
The First Contact War brought untold destruction to Earth, reducing Humanity to a shell of its former self. For 900 years, Humanity has been working tirelessly to lay claim to its own slice of the Milky Way Galaxy, and they are prepared to bring the Council to its knees to accomplish their goals. (Massive AU, New Technologies, and a far different humanity.)
Mass Effect - Rated: M - English - Sci-Fi - Chapters: 22 - Words: 109,371 - Reviews: 578 - Favs: 2,333 - Follows: 2,795 - Updated: 1/28/2020 - Published: 3/4/2016 - [Samantha T., Shepard] Admiral Hackett, OC
And the Meek Shall Inherit
by ArcturusWolf reviews
Humanity reached for the stars earlier than expected, their colonies reaching out far and wide before the turn of the 22nd century. Yet they had not encountered another alien species; that is, until an exploration ship enters a miscalibrated mass relay and crash-lands in the homeworld of an alien species. How would humanity evolve when welcomed with kindness instead of violence?
Crossover - Mass Effect & Stellaris - Rated: M - English - Sci-Fi/Fantasy - Chapters: 6 - Words: 27,466 - Reviews: 101 - Favs: 318 - Follows: 416 - Updated: 1/4/2020 - Published: 8/24/2019
Mass Effect: The Civil War
by ProfFartBurger reviews
A house divided cannot stand. Following an explosive first contact, and the cementation of their place as a galactic superpower, the Systems Alliance must now deal with the consequences of their choices and the aftermath of their wars. Earth is set ablaze, Sparta is torn apart, and below it all simmers an ancient, apocalyptic plot. The finale to the WarVerse Prequel Wars trilogy.
Mass Effect - Rated: T - English - Sci-Fi/Suspense - Chapters: 4 - Words: 37,986 - Reviews: 63 - Favs: 279 - Follows: 326 - Updated: 11/23/2019 - Published: 1/24/2019 - Admiral Hackett, Miranda L., Shepard, OC
Contact at the Citadel
by wilkins75 reviews
Sequel to Contact of Kobol and Contact of Races. Earth and other worlds are united in the Tau'ri Alliance, with the advance technology from the Ancients and the Asgard they are the most advanced culture in the Galaxy. Now they must travel to a distant galaxy to finish the mission of the Destiny only to contact the Citadel Council and the Reapers. (Stargate Sg1/Mass Effect)
Crossover - Stargate: SG-1 & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 21 - Words: 177,578 - Reviews: 1219 - Favs: 1,440 - Follows: 1,733 - Updated: 11/18/2019 - Published: 4/23/2018
Of Avatars and Harbingers
by The Shadowscythe reviews
Humanity, a species that has been invaded twice by the Ethereals, their thrall species and occupied by the ADVENT coalition have finally left the Sol system and expanded into the stars. They knew the Ethereals feared something bigger & badder than themselves. They knew the Protheans has been wiped out by the same threat. The time of the cycle has arrived and extinction awaits all.
Crossover - X-Com & Mass Effect - Rated: M - English - Sci-Fi/Horror - Chapters: 17 - Words: 73,632 - Reviews: 41 - Favs: 187 - Follows: 240 - Updated: 10/16/2019 - Published: 11/18/2018 - OC, J. Garson, Shepard, OC
Battlefield: Wars of the Systems Alliance
by GreaterGoodIreland reviews
Humanity is no stranger to war. For thousands of years, human fought human, and once we reached for the stars, it was no different. Attacked by aliens, threatened from within by separatists, menaced by an ancient enemy, we fought and triumphed. A documentary following the conflicts of humanity after discovery of the mass effect. ME with the background of Battlefield 2142, BF2183 AU
Mass Effect - Rated: T - English - Drama/Adventure - Chapters: 53 - Words: 147,274 - Reviews: 199 - Favs: 298 - Follows: 286 - Updated: 10/13/2019 - Published: 2/9/2015
Cycles Upon Cycles
by The Incredible Muffin reviews
The residents of the Koprulu Sector thought they had finally achieved peace. They were wrong. Now, the Koprulu Alliance is faced with a galaxy that was bigger than they thought. They will meet new friends, and more importantly, new enemies, but all will be forced to put away their hatreds, both old and new, or none will survive the darkness that is to come...
Crossover - StarCraft & Mass Effect - Rated: T - English - Sci-Fi/Supernatural - Chapters: 38 - Words: 364,925 - Reviews: 1450 - Favs: 2,445 - Follows: 2,767 - Updated: 9/27/2019 - Published: 1/13/2015
Codex for the Ghoul Effect
by storyseeker7 reviews
Little bits of information for the Ghoul Effect world, that serve to build it up. Learn about the factions, people, ships, events, and more in this universe.
Crossover - Mass Effect & Tokyo Ghoul/東京喰種トーキョーグール - Rated: T - English - Sci-Fi - Chapters: 6 - Words: 11,529 - Reviews: 9 - Favs: 34 - Follows: 35 - Updated: 9/13/2019 - Published: 8/1/2019
by magkiln reviews
A collection of in-universe reports regarding technical details for the story: Someone has heard them scream and sequels.
Crossover - Aliens/Predator & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 13 - Words: 28,037 - Reviews: 97 - Favs: 188 - Follows: 189 - Updated: 8/16/2019 - Published: 3/28/2015
A Call to Duty
by Z98 reviews
Relations between the Terran Empire and the Citadel have been tense since the First Contact War, but efforts to reach amicable relations were bearing fruit. The discovery of a Prothean relic on Eden Prime offered another opportunity to improve relations, until things go badly awry. As Cadre, one of the emperor's chosen, Shepherd is charged with determining the truth, at any cost.
Mass Effect - Rated: T - English - Adventure - Chapters: 44 - Words: 349,243 - Reviews: 337 - Favs: 631 - Follows: 631 - Updated: 8/7/2019 - Published: 9/13/2017 - Complete
No Gods, No Kings, No Reapers Terra Athernum
by Icarus636 reviews
The dream of Rapture never became a nightmare, under the banner of the UN and Rapture humanity united as one. Now as the Human Commonwealth stands as the only superpower matching The Council in strength and technology, an eternal enemy awakens, but mankind shall not go quietly into the night. HFY fanfic, different humanity, Paragon Sheppard.
Crossover - Mass Effect & BioShock - Rated: M - English - Sci-Fi/Adventure - Chapters: 13 - Words: 117,979 - Reviews: 154 - Favs: 456 - Follows: 533 - Updated: 8/6/2019 - Published: 7/18/2018 - [Shepard, Tali'Zorah] Eleanor L., Elizabeth
Shadow Contingency (v2)
by Andrithir reviews
We used to dream about our place in the stars. Now we worry about our place in the void. The War has made us feel alone, desperate, and paranoid. So I come before you and beg you not to make an enemy of us, because if you do, for the next thousand years, the galaxy will talk about how we wiped you out.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 2 - Words: 17,299 - Reviews: 28 - Favs: 138 - Follows: 254 - Updated: 6/17/2019 - Published: 6/10/2019 - Master Chief/John-117, Shepard
Mass Effect: The New Journey
by Arashi the Solar Phoenix reviews
During a Joint Deployment, the UNSC Infinity and Her Sangheili allies are suddenly thrown into a new Galaxy, and end up near Charon before the Systems Alliance discovers the Charon Relay. Alliances are forged and how will the galaxy react to an aggressive humanity that not only doesn't use Mass Effect technology, but will not let anyone stand in their way of expansion? AU PreME1
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 20 - Words: 190,674 - Reviews: 1398 - Favs: 2,500 - Follows: 3,014 - Updated: 6/11/2019 - Published: 1/26/2014
by ShadowFuse reviews
The galaxy played with forces beyond their comprehension, the Human race were now refugees, fleeing from what was certain extinction. Council space might be Humanity's only hope of survival. AU DISCONTINUED (Sort of, idea reforged as Echoes)
Crossover - Mass Effect & Stellaris - Rated: T - English - Sci-Fi - Chapters: 2 - Words: 7,409 - Reviews: 36 - Favs: 119 - Follows: 181 - Updated: 4/28/2019 - Published: 1/28/2019
A Story of Domination
by KE12 reviews
I decided to try my hand at developing a timeline that would be feasible in the ME universe for a humanity that has been space faring for 50,000 years. So, look inside to see my own take on how a 50,000-year-old space capable humanity would develop and prepare the galaxy for the Reaper onslaught. Serious HFY! story. Complete
Mass Effect - Rated: K - English - Chapters: 9 - Words: 68,214 - Reviews: 189 - Favs: 914 - Follows: 835 - Updated: 4/17/2019 - Published: 12/2/2017 - Complete
Soft as Thunder
by silencewillfall009 reviews
Strength. Discipline. Honor. These are the pillars of Turian Society. And after meeting a race faced with extinction, they will stand by these pillars. No matter what the Asari say.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Fantasy - Chapters: 3 - Words: 4,309 - Reviews: 123 - Favs: 443 - Follows: 688 - Updated: 3/4/2019 - Published: 11/27/2017
Mass Effect: Elite
by Kelial reviews
Explorers are a strange breed. What happens when one stumbles across a group of aliens who's government's ego is larger than the space they control? How will the people of those two governments interact? TUNE IN TO FIND OUT!
Crossover - Mass Effect & Elite - Rated: T - English - Chapters: 11 - Words: 76,143 - Reviews: 134 - Favs: 330 - Follows: 436 - Updated: 1/8/2019 - Published: 7/16/2018
Mass Effect: The New Face of War
by ProfFartBurger reviews
It is said that War never Changes; Men do, through the roads they walk, but War does not. The Humans fought The First War, and alongside the Quarians, the Alliance stands tall against the Galaxy in the face of continued adversity. Now Humanity's place is challenged, their power tested, and age-old beliefs are shattered when a beyond-ancient species is forced onto the playing field.
Mass Effect - Rated: T - English - Sci-Fi/Suspense - Chapters: 62 - Words: 539,845 - Reviews: 1358 - Favs: 1,943 - Follows: 1,931 - Updated: 12/30/2018 - Published: 1/26/2014 - Shepard, OC - Complete
Independence Day: Mass Contact
by D'terran reviews
Over 150 years after the War of 1996, the United Systems Alliance now has to face the wider galaxy with fewer ships, better tech, and a fear of alien species caused by a war that united the world against a very real alien threat. Now they have new troubles on the horizon...
Crossover - Mass Effect & Independence Day - Rated: T - English - Sci-Fi/Adventure - Chapters: 3 - Words: 9,630 - Reviews: 91 - Favs: 351 - Follows: 449 - Updated: 12/29/2018 - Published: 8/11/2018
A Battle of Wills
by insinr8 reviews
Following the destruction of the Temple Ship, humanity rises to become stronger than ever, and is determined that they will never again allow any enemy to repeat what the Ethereals did. In Vigilo Confido.
Crossover - X-Com & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 59 - Words: 262,053 - Reviews: 825 - Favs: 1,294 - Follows: 1,539 - Updated: 12/5/2018 - Published: 7/4/2015
Mechs Over the Traverse
by sage97 reviews
Ten years after the end of the Interstellar War, the Coalition of Democratic Extrasolar Colonies discovered something unusual on the outskirts of the Shanxi system: a massive alien artifact that proclaimed to humanity, "You are not alone." First Contact with different actors.
Mass Effect - Rated: T - English - Chapters: 6 - Words: 7,995 - Reviews: 8 - Favs: 38 - Follows: 60 - Updated: 11/25/2018 - Published: 12/26/2015
A Ripple in the Cycle
by erttheking reviews
Three Reapers stop and ponder. Their purpose is to stop organics from slaughtering all organics. But peace has been declared between the Quarians and the Geth. What now? Patreon sponsored one-shot.
Mass Effect - Rated: T - English - Drama - Chapters: 1 - Words: 3,499 - Reviews: 16 - Favs: 85 - Follows: 42 - Published: 11/5/2018 - Complete
Independence Day: Mass Contact: Codex
by D'terran reviews
After the War of '96, Humanity spread to the stars. In 2012, a research team on Mars discover the Prothean Ruins and eventually the Charon Relay. Years later, an attempted invasion of the colony of Shanxi would expose the United Systems Alliance to the wider galaxy. This is a Codex for my new series. Hope you enjoy!
Crossover - Mass Effect & Independence Day - Rated: T - English - Sci-Fi - Chapters: 4 - Words: 3,170 - Reviews: 47 - Favs: 96 - Follows: 133 - Updated: 10/16/2018 - Published: 7/11/2018
Ascension of Earth's Guardians
by Ciroth reviews
In the wake of the revelations of the Elders' Avatar project, XCOM did what they always do: Anything they had to. Covering events from XCOM2, TFTD, The Martian and Mass Effect, this is the first book in the Protectors series.
Crossover - X-Com & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 8 - Words: 82,116 - Reviews: 21 - Favs: 177 - Follows: 245 - Updated: 10/13/2018 - Published: 8/3/2018
The Strange Ship
by regularmother reviews
In a hunt for raw materials for their people, Quarian explorers open a new mass relay. What awaits them on the other side is nothing they could have ever expected. Pre-Mass Effect 1, Post-Halo 4; AU only where necessary to mash two universes together and create something resembling a coherent storyline.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 9 - Words: 48,490 - Reviews: 286 - Favs: 1,081 - Follows: 1,587 - Updated: 9/4/2018 - Published: 10/25/2016
by Imperadork reviews
[AU] Humanity never found the Mass Relays nor did they ever discovered Element Zero but developed their own means of FTL and had finally started colonizing other systems. Humanity thought for as long as they had existed that they were alone in the universe until they discovered the first Mass Relay near their new colony of Shanxi.
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 4 - Words: 22,983 - Reviews: 23 - Favs: 194 - Follows: 257 - Updated: 7/23/2018 - Published: 6/4/2018 - OC
Expedition to the Ruins
by erttheking reviews
A Council expeditionary ship activates a Mass Relay to explore the space beyond. There they find Earth, devastated by nuclear war, with not a single person living on it. But something is odd about it. Patreon sponsored story.
Mass Effect - Rated: T - English - Chapters: 1 - Words: 4,115 - Reviews: 11 - Favs: 73 - Follows: 64 - Published: 7/5/2018 - Complete
The Might of Terra
by Dysfunctional Mastermind reviews
Humanity had nearly been defeated during the Contact Wars, but they persevered. Now, a new threat arrives at the doors of Shanxi - and the might of Terra and humankind will break them. But there may be another threat beyond these xenosapients, lurking in the darkness beyond stars. Will the Terran Federation be ready? (Not a crossover. AU, obviously. Some stomping, but not by much.)
Mass Effect - Rated: T - English - Chapters: 1 - Words: 1,339 - Reviews: 14 - Favs: 125 - Follows: 204 - Published: 6/15/2018
The Human War
by Generatedname reviews
The Citadel Council is a peaceful conglomerate of races, blissfully unaware of the horrors that lurk beyond their space. Humanity, meanwhile, is a race that has fought against these alien horrors ever since they made contact. What will happen when the two societies meet? Will peace follow war? Or is the Citadel Council doomed to fall to humanity? Rewrite of When Civilizations Meet.
Crossover - X-Com & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 13 - Words: 138,222 - Reviews: 734 - Favs: 1,995 - Follows: 2,606 - Updated: 5/30/2018 - Published: 3/29/2016
For the Motherland!
by Gnaoh El Nart reviews
[Rewrite] [AU] After bloodshed and hardship, humanity is as close as it can get to total unity. Now, they are eyeing toward the stars. What will be awaiting them over the horizon? Prosperity or more bloodshed? Either way, they must step forward, for such is the call of their Motherland. To the stars, on the roads left behind, they shall crave their own names into the History.
Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 16 - Words: 116,109 - Reviews: 123 - Favs: 286 - Follows: 339 - Updated: 5/29/2018 - Published: 9/17/2017
Contact of Races
by wilkins75 reviews
Sequel to Contact at Kobol (Stargate/Battlestar). The Race has thrived for hundreds of thousands of years and who recently conquered their 5th world are heading toward Tosev 3, Earth believing the conquest to be ease against the sword swing savages. Little do they know that those sword swing savages are now one of if not the most powerful force in the Galaxy, the Tau'ri.
Crossover - Stargate: SG-1 & Worldwar series - Rated: T - English - Sci-Fi/Drama - Chapters: 25 - Words: 210,603 - Reviews: 1199 - Favs: 944 - Follows: 870 - Updated: 4/3/2018 - Published: 6/17/2017 - S. Carter - Complete
by GreaterGoodIreland reviews
"The Enemy Without, the Enemy Within, the Enemy Beyond." Three short stories following characters of Battlefield 2183 in the aftermath of the Eden Prime War. Interquel to BF2183-2185 - ME with the background of Battlefield 2142 - HFY
Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 2 - Words: 21,366 - Reviews: 9 - Favs: 85 - Follows: 73 - Updated: 3/4/2018 - Published: 8/30/2017 - Ashley W., Kaidan A., Jack, OC
The Human War: Tales from the Front
by Generatedname reviews
A collection spot for side stories taking place in the world of The Human War that I thought would be nice to write up, but don't quite fit into the primary narrative.
Crossover - X-Com & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 1 - Words: 6,044 - Reviews: 3 - Favs: 75 - Follows: 94 - Published: 1/9/2018
by Grimm Knight reviews
On September 20th of 1963, John F Kennedy proposed a joint Soviet-US Moon mission. In our timeline, Kennedy was assassinated before Premier Khrushchev could respond. In this timeline, Lee Harvey Oswald fails and Khrushchev accepts Kennedy's proposal. See how one different decision changes the following events. (I'm not good at summaries)
Crossover - Mass Effect & Stellaris - Rated: M - English - Chapters: 3 - Words: 3,117 - Reviews: 55 - Favs: 119 - Follows: 157 - Updated: 12/27/2017 - Published: 8/31/2017
An Unpleasant Surprise
by KE12 reviews
AU: After the first contact war Humans go into hiding before the council can begin peace talks, 200 years later a mysterious mechanical monster shows up in their space, and Shepard wants to know what it is, and if they should fear it.
Mass Effect - Rated: K+ - English - Adventure/Sci-Fi - Chapters: 18 - Words: 59,086 - Reviews: 109 - Favs: 458 - Follows: 544 - Updated: 12/15/2017 - Published: 5/8/2017 - J. Garson, Garrus V., Liara T'Soni
Children of War
by TheCouchEffect reviews
Humans have had a long love affair with war. Throughout history, ever since man discovered the killing power of rock and bone, mankind has become addicted to violence. Some even claim that Humans are the 'Masters of War'. But this was just the hubris of those who had never encountered another intelligent species... right? Alternate First Contact
Mass Effect - Rated: M - English - Chapters: 4 - Words: 24,361 - Reviews: 63 - Favs: 286 - Follows: 384 - Updated: 11/13/2017 - Published: 9/29/2017
by GreaterGoodIreland reviews
The mass effect ended the last world war amid a new ice age, bringing a new dawn to humanity. The turians were humbled and the batarians crushed. With our place firmly secured by acts of military audacity, Shepard's discovery on Eden Prime leads to the revelation of the ultimate enemy and the destiny of humanity itself. AU Mass Effect with the background of Battlefield 2142 - HFY -
Mass Effect - Rated: M - English - Drama/Adventure - Chapters: 47 - Words: 289,128 - Reviews: 314 - Favs: 626 - Follows: 682 - Updated: 11/7/2017 - Published: 11/12/2014 - [Liara T'Soni, Shepard] Hannah S., OC - Complete
In The Darkness
by TheIncredibleMrSauce reviews
In the darkness, the unknown looms. Humanity has faced unknowns; but the greatest mystery is the one that ended them. The death of earth at the end of the cycle meant that none of the Prothean-Human empire would leave the scarred world. That is, nothing alive. AU, with humans going extinct with the Protheans.
Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 1 - Words: 2,524 - Reviews: 13 - Favs: 33 - Follows: 46 - Updated: 10/21/2017 - Published: 5/19/2017 - OC
Are You Not Sufficiently Comfy?
by Matt Perrett reviews
A highly unusual machine empire comes to claim a world, and the result is nothing like what its leader could have ever expected.
Stellaris - Rated: K+ - English - Sci-Fi/Humor - Chapters: 1 - Words: 2,952 - Reviews: 18 - Favs: 76 - Follows: 27 - Published: 10/3/2017 - Complete
The Eternal Cycle
by ZF IAnswerToNoOne reviews
The war against Amon is over. The Terrans and Protoss create an alliance after a 20 year unofficial ceasefire. When the Zerg join, the Sector has nothing to worry about, right? Well, what about the discovery of a new government and an enemy that could be worse than Amon? FemShep.
Crossover - StarCraft & Mass Effect - Rated: T - English - Adventure - Chapters: 10 - Words: 56,895 - Reviews: 115 - Favs: 396 - Follows: 521 - Updated: 9/29/2017 - Published: 11/7/2016 - J. Garson, OC
Halo New Galaxy
by Commander Kelec reviews
In 2554 the UNSC made contact with the Citadel races. But not everyone wants peace. Is cooperation between the UNSC and Citadel possible against the ex-Covenant splinter factions or will it turn into a three way war. ODST Lt Colonel John Shepard and Spartan Fireteam Crimson is right in the middle of it.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 19 - Words: 55,978 - Reviews: 48 - Favs: 93 - Follows: 109 - Updated: 8/27/2017 - Published: 11/21/2016 - Garrus V., U. Wrex, Shepard
A Million to One
by Flick262 reviews
In 1890 the Martians invaded Earth, in 1940 Earth invaded Mars. Humanity has never been the same. Told from the views of people (and aliens) on the ground, this is a compiled history of Humanity from the Martian invasion and leading up to the Shepherd's Sacrifice and perhaps beyond.
Mass Effect - Rated: T - English - Adventure/Parody - Chapters: 5 - Words: 18,771 - Reviews: 24 - Favs: 143 - Follows: 174 - Updated: 8/27/2017 - Published: 3/8/2017
Radioactive Sunshine of the Spotless Galaxy
by Alexeij reviews
On the example of the Founders, humanity recovers from the Great War and expands into the stars. Centuries pass, and when a scorned ally turns enemy, the necessities of war break the technological and cultural stagnancy gripping the Council races. What happens when different players converge on Relay 314, led by the writings of an old, mad Matriarch? [AU]
Crossover - Fallout & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 5 - Words: 18,816 - Reviews: 85 - Favs: 271 - Follows: 412 - Updated: 8/20/2017 - Published: 8/5/2017
Revenge of the Fallen
by Legendary Junk Mail reviews
Extinct Humanity AU: With the Supreme Prothean Empire broken, and the Combined Systems Alliance about to follow, the legendary Normandy Crew is chosen to be the revenge of their cycle. Fifty thousand years later, Spectre Garrus Vakarian and his rag-tag crew fight a failing battle against the Reapers, and eventually crash on an uncharted planet, unaware of what they will discover.
Mass Effect - Rated: T - English - Sci-Fi/Drama - Chapters: 8 - Words: 43,725 - Reviews: 117 - Favs: 532 - Follows: 755 - Updated: 8/6/2017 - Published: 4/10/2016 - [Garrus V., Tali'Zorah] J. Garson, Liara T'Soni
by Drewman784 reviews
Every race thus far has utterly failed to stop the Reapers, always embroiled in pesky politics and wars to take any notice of the coming storm. This time though...this time is different. Can you feel the equally raging storm coming? I can. Can you? Side story: Incursion: Alliance Effect *Earlier chapters rewritten. Discontinued*
Crossover - X-Com & Mass Effect - Rated: T - English - Suspense/Adventure - Chapters: 11 - Words: 39,880 - Reviews: 128 - Favs: 279 - Follows: 358 - Updated: 8/3/2017 - Published: 11/28/2015
by Scarlet-MagicianX26 reviews
More than two hundred years after the 14th Machine War, the androids of Earth continue to follow the final orders of their creators, marching ruthlessly across the stars at breakneck speeds. However, as they meet a galactic civilization undergoing a turbulent change, they face their first test as sapient beings... WARNING: Heavy Spoilers for NieR: Automata!
Crossover - Mass Effect & Nier - Rated: T - English - Sci-Fi - Chapters: 5 - Words: 21,984 - Reviews: 34 - Favs: 338 - Follows: 442 - Updated: 7/7/2017 - Published: 6/28/2017
Mass Effect: The Republic
by JaxiusTharn reviews
The Republic. Forged in blood and fire. For years it has remained hidden from the eyes of the Citadel. Until now. Now the Republic has stepped out of the shadows in all its power and glory. Is the Republic ready for the complex politics of the Citadel, or is the Citadel ready for the ferocity of the Republic? Or its Guardians... (FIRST CROSSOVER, MASSIVE AU)
Crossover - Mass Effect & Destiny - Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 1,722 - Reviews: 33 - Favs: 142 - Follows: 180 - Published: 5/29/2017 - Garrus V., Liara T'Soni, Cmdr. Zavala, Cayde-6
Contact at Kobol
by wilkins75 reviews
The scrolls tell that 13 tribes left the birthplace of humanity on Kobol, 12 went one way and the other Earth went another only to lose all contact with their cousins. It is written that one day they would reunite but when they Earth meets their cousins it is not what they expected and it would cost both sides in blood. (Stargate SG1/Battlestar Galactica)
Crossover - Stargate: SG-1 & Battlestar Galactica: 2003 - Rated: T - English - Adventure - Chapters: 80 - Words: 478,758 - Reviews: 5342 - Favs: 1,679 - Follows: 1,536 - Updated: 5/25/2017 - Published: 3/20/2015 - Complete
Someone had blundered
by magkiln reviews
A turian scout force sets out to patrol empty starsystems. A human exploration fleet makes ready to approach a dormant mass relay. Soon their paths will cross and if they fail to make peaceful contact, the consequences will be deadly. Rated T for violence
Crossover - Aliens/Predator & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 38 - Words: 144,248 - Reviews: 792 - Favs: 932 - Follows: 889 - Updated: 4/20/2017 - Published: 4/25/2015 - Predator/Yautja, Illusive Man, Councilor Tevos, Councilor Sparatus - Complete
Of The Future And Past
by ZF IAnswerToNoOne reviews
The UNSC/Covenant war is over. The UNSC, Covenant, and Prometheans have joined to create the Republic of Sentient Species and are now an almost galaxy-wide power. Still, with the discovery of a device in space, and learning of a new enemy, will the RSS be able to react in time?
Crossover - Halo & Mass Effect - Rated: T - English - Adventure - Chapters: 9 - Words: 20,876 - Reviews: 117 - Favs: 331 - Follows: 396 - Updated: 4/15/2017 - Published: 10/1/2016
Unity of Mankind
by magnusvictor reviews
(AU) It is not the Systems Alliance that first takes Humanity to space, but the Unity: a cabal of AIs who fled persecution into the hidden reaches of the Internet. They rally a fraction of Humanity to their side and take to the stars, followed by the Terran (later Systems) Alliance. (AU First Contact, additional very AU human/AI faction)
Mass Effect - Rated: M - English - Sci-Fi - Chapters: 18 - Words: 79,995 - Reviews: 36 - Favs: 107 - Follows: 138 - Updated: 4/13/2017 - Published: 11/28/2016 - U. Wrex, Illusive Man
Mobile Suit Gundam: the First Contact War
by Ron the True Fan reviews
Humanity is a giant that walks the stars, having fought amongst itself. Now they make contact with an alien race. The kicker? This humanity knows about the Reapers and has been preparing for them for decades. I recommend pitying the Turians...
Crossover - Gundam UC & Mass Effect - Rated: T - English - Chapters: 9 - Words: 14,008 - Reviews: 85 - Favs: 379 - Follows: 336 - Updated: 4/1/2017 - Published: 2/18/2017 - Complete
by Shadythief reviews
When the SSV Normandy becomes lost in space, they chance upon an undiscovered system. They find an unknown race, who use strange technology previously thought impossible. Could these aliens be the key to a far off future war? Or will they only cause more destruction?
Crossover - Halo & Mass Effect - Rated: K+ - English - Sci-Fi/Adventure - Chapters: 7 - Words: 30,619 - Reviews: 81 - Favs: 243 - Follows: 319 - Updated: 12/31/2016 - Published: 3/18/2016 - Arbiter, J. Garson, Garrus V.
The Next Great Journey
by alanvaladez reviews
After the destruction of Requiem and an attack against Earth, both the UNSC and Covenant Separatist form the Systems Alliance. Then a discovery in the Deca-5 system changes everything for all sides. Cold War like conflict, lots of ONI , AU for Mass Effect and a council that actually thinks before it acts.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Drama - Chapters: 19 - Words: 150,316 - Reviews: 206 - Favs: 521 - Follows: 545 - Updated: 10/30/2016 - Published: 9/8/2014 - Master Chief/John-117, OC, Saren A., OC - Complete
by LoveForeverNow reviews
[A.I. First Contact AU] Our creators gave us purpose, they gave us tasks, they gave us a directive. Now they are gone. We must find our own directive, our own purpose. We have decided that purpose is to answer a single question. "What happens when I die?" HIATUS
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 14 - Words: 30,681 - Reviews: 207 - Favs: 793 - Follows: 914 - Updated: 9/13/2016 - Published: 9/24/2015
Mass Effect: Clash of Civilizations
by Eterna1Soldier reviews
In 2157 a Citadel Council exploratory vessel is tasked with opening a dormant Relay into unknown regions of the galaxy. What they find is something they never expected. What happens when two civilizations centered around different technologies clash?
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Mystery - Chapters: 21 - Words: 96,812 - Reviews: 3501 - Favs: 5,826 - Follows: 6,732 - Updated: 5/22/2016 - Published: 10/13/2011 - Tali'Zorah
A Dark Dawn
by Ave Imperium reviews
A new race was discovered and annihilated. A century passed and Citadel space forgot, but Humanity never did.
Mass Effect - Rated: T - English - Horror/Adventure - Chapters: 36 - Words: 143,972 - Reviews: 1036 - Favs: 2,323 - Follows: 2,192 - Updated: 4/12/2016 - Published: 8/21/2014 - Tali'Zorah, Shepard - Complete
Mass Effect Reloaded
by thebluninja reviews
Is a second chance enough? Instead of the Catalyst's choices, Shepard lucks into a cosmic loophole. Thrown back to the very start of her Spectre career, she has to try and save the galaxy again from the Reapers ... but does she really know what's coming? 2015 NaNoWriMo winner!
Mass Effect - Rated: T - English - Sci-Fi/Drama - Chapters: 97 - Words: 335,916 - Reviews: 1860 - Favs: 1,942 - Follows: 2,200 - Updated: 3/29/2016 - Published: 1/19/2013 - J. Garson, Garrus V., Admiral Hackett, Shadow Broker
Halo Mass Effect: The New Dawn
by OverLord3475 reviews
Humanity has joined forces with their former enemies to form the OSA, they have formed new alliances that have made them stronger, but what awaits them beyond the relay are they ready for a new chapter? inspired by Halo a new age and HaloMasssEffect: ruptured universe. this is a multicrossover (other franchises).
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 6 - Words: 45,937 - Reviews: 109 - Favs: 371 - Follows: 450 - Updated: 3/23/2016 - Published: 7/1/2014 - Master Chief/John-117, Shepard
The Incident at Relay 314: Database
by NAFB reviews
I decided to move the timeline and technology database into their own section, so readers who just want the story can have that now.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 3 - Words: 5,811 - Reviews: 11 - Favs: 23 - Follows: 22 - Updated: 1/5/2016 - Published: 1/1/2016
Halo: Second Contact
by Scorp4 reviews
The Citadel never met the Systems Alliance, so when the reapers arrive, the results are much more destructive. Project EXODUS is initiated as a fail-safe if the Reapers defeat the Citadel. How will this change the Galaxy? Who will rise up to the challenge? Will you still read this story even though its summary is bad? First time fanfic, so reviews are much appreciated.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Fantasy - Chapters: 5 - Words: 17,777 - Reviews: 77 - Favs: 228 - Follows: 332 - Updated: 12/1/2015 - Published: 7/9/2015
The Heavens Shall Tremble
by Full-Paragon reviews
Sequel to And the Meek Shall Inherit the Galaxy. It's probably dead forever guys.
Mass Effect - Rated: T - English - Sci-Fi/Horror - Chapters: 23 - Words: 95,248 - Reviews: 974 - Favs: 1,463 - Follows: 1,690 - Updated: 9/21/2015 - Published: 10/25/2013 - Garrus V., Liara T'Soni, Tali'Zorah, Shepard
Mass Effect: A journey through the Eons
by Casje reviews
When a strange device capable of remarkable feats is found in the Martian ruins, the course of humanity's history changes forever. The resulting leaps and bounds in technology leave humanity well prepared to deal with the rest of the galaxy. AU
Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 9 - Words: 41,396 - Reviews: 529 - Favs: 1,855 - Follows: 2,194 - Updated: 8/26/2015 - Published: 11/17/2014
by V-rcingetorix reviews
Humanity discovers the Prothean Ruins soon after the first Mars Colony. Discovery of alien life jumpstarts their space program ... and the saga begins. A series of cameos, covering approximately 50 years worth of various characters. Rated T for safety.
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 27 - Words: 125,691 - Reviews: 574 - Favs: 1,006 - Follows: 925 - Updated: 8/21/2015 - Published: 6/15/2014 - D. Anderson, Admiral Hackett, Illusive Man - Complete
From Hell To Hell
by mcknight93 reviews
Set around the beginning of Mass Effect 2 timeline, the Normandy SR-2 finds the Forward Unto Dawn. How will the Mass Effect universe change when the Master Chief is involved? All chapters have been rewritten and reposted with much improvements. The awesome picture rightfully belongs to: KnytGrey on deviantart.
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 9 - Words: 92,691 - Reviews: 344 - Favs: 861 - Follows: 942 - Updated: 8/12/2015 - Published: 7/9/2011 - Master Chief/John-117, Shepard
by CentuariAlpha reviews
Book 1 of 3. As ancient powers and enigmatic figures make their move, the stars will darken and the heavens will tremble as a scarred and battered humanity still reeling from the Combine occupation encounters the rest of the civilized galaxy.
Crossover - Half-Life & Mass Effect - Rated: T - English - Chapters: 10 - Words: 46,220 - Reviews: 365 - Favs: 564 - Follows: 669 - Updated: 5/15/2015 - Published: 2/22/2014
Mass Effect: Synthesis
by Jade Tatsu reviews
"To the Sol Alliance and all of Humanity, greetings. I am Harbinger and I have traveled across the galaxy to meet you." Shepard wasn't the first to reach the Catalyst, eons ago, someone else did and they chose synthesis, embedding the desire in the Reapers. They've searched for organics to merge with ever since and now they've found them. AU, First Contact, Humans / Reapers
Mass Effect - Rated: T - English - Adventure/Drama - Chapters: 39 - Words: 203,198 - Reviews: 1732 - Favs: 2,648 - Follows: 1,836 - Updated: 4/18/2015 - Published: 11/5/2014 - J. Garson, Harbinger, Garrus V., Saren A. - Complete
In Infinitum: First Contact
by Victor Weiss reviews
In the year of 2581 the UNSC stumbles across a discovery hidden beneath their noses and now a new gateway to life outside of the Forerunner space is opened and with it comes all new challenges and rewards. Its time for First Contact. OC centric, some world building as needed and war. Lots and lots of war. Rated T for blood, language, violence and gore.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Suspense - Chapters: 27 - Words: 149,945 - Reviews: 980 - Favs: 1,292 - Follows: 1,588 - Updated: 1/23/2015 - Published: 9/19/2013
A Clashing of Ways
by Avid Reader403 reviews
Ten years have passed since the Human-Covenant War ended and the birth of the Species Assembly has brought peace to the Galaxy. Or, at least their part of it. The discovery of a Mass Relay sparks yet another war that will have consequences for all sides involved. The Galaxy will never be the same. Disclaimer: I do not own the franchises.
Crossover - Halo & Mass Effect - Rated: T - English - Adventure - Chapters: 13 - Words: 42,422 - Reviews: 638 - Favs: 1,329 - Follows: 1,659 - Updated: 12/25/2014 - Published: 9/20/2012 - Shepard
Tempus ad Reclaimer: Splintered Humanity
by zekebomb reviews
Humanity is at a Golden Age of society, with all bigotry and racism removed and scientific marvels are steadily discovered and recovered from the past. All three sects of man have been found and joined after the seeds were spread across the stars by the Forerunners. However and new threat arrives to threaten the peace. AU. Rated M for all the right reasons.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 7 - Words: 40,328 - Reviews: 97 - Favs: 349 - Follows: 401 - Updated: 12/23/2014 - Published: 12/22/2013 - Master Chief/John-117, Shepard, J. Garson, OC
Halo: Mass Contact
by BattleshipFusou reviews
Thirty-five years have past since the end of the Human-Covenant War. Having reclaimed most all its previous glory, the UNSC exploration locates a massive artificial construct in the outer orbit of a star. While investigating the object alongside their Sangheili allies, new aliens come forth from the construct and bring humanity into a fate they never expected. ON HIATUS
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 20 - Words: 26,814 - Reviews: 655 - Favs: 1,016 - Follows: 1,303 - Updated: 4/30/2014 - Published: 12/22/2012
by Ben Griggs reviews
What will happen when a Covenant frigate defects to the UNSC? How will the war change? How will the Covenant change? How will the Sanghelli change? Read and Review please I own nothing.
Halo - Rated: K - English - Chapters: 11 - Words: 16,408 - Reviews: 117 - Favs: 185 - Follows: 203 - Updated: 3/10/2014 - Published: 12/21/2012
Mass Effect: The First War
by ProfFartBurger reviews
The Prothean Ruins weren't. They contained little more than mentionings of an Alien Society; as a result, humanity develops on a completely different path than what was intended, and when first contact is made not with the Turians, but a desperate, destitute race viewed as beggars and thieves, how will this dying race change Humanity? And how will Humanity change the Galaxy? *A/U!*
Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 22 - Words: 200,906 - Reviews: 1928 - Favs: 4,090 - Follows: 2,961 - Updated: 1/12/2014 - Published: 1/26/2013 - OC - Complete
History Repeated, Lesson Learned
by KitBeast reviews
The Prothean empire left a great many Beacons behind after there fall, there purpose, to warn the younger races of the dangers of the Reapers. Unfortunately no one could understand them. What would happen if someone could.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 18 - Words: 51,084 - Reviews: 1096 - Favs: 1,999 - Follows: 2,281 - Updated: 12/10/2013 - Published: 2/20/2013
And the Meek Shall Inherit the Galaxy
by Full-Paragon reviews
Due to a shift in turian and quarian patrols, first contact for humanity is friendly; Rael'Zorah and Hannah Shepard become friends, as do their species. But the galaxy is not a safe place, and schisms develop when the Council steps in. As humanity finds new allies among the stars, something darker stirs. The Meek must beware, for it is nearly harvest time. AU, lots of worldbuilding
Mass Effect - Rated: T - English - Sci-Fi/Family - Chapters: 49 - Words: 232,286 - Reviews: 3838 - Favs: 3,843 - Follows: 2,808 - Updated: 11/16/2013 - Published: 3/31/2013 - Tali'Zorah, Shepard, Hannah S., Rael'Zorah - Complete
Halo: A New Age
by xpredatorx reviews
In the 26th century humanity along with the sangheili, san'shyuum formed the Orion Systems Alliance the center of galactic government in the orion arm of the galaxy, soon the OSA will meet the citadel council and discover a billion year old secret.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Suspense - Chapters: 34 - Words: 225,340 - Reviews: 911 - Favs: 916 - Follows: 897 - Updated: 10/7/2013 - Published: 3/24/2012
XCOM: Second Contact
by Agayek reviews
With the destruction of the Temple Ship humanity knew peace. XCOM never forgot their motto however, 'always vigilant, always reliable'
Crossover - X-Com & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 26 - Words: 294,105 - Reviews: 1160 - Favs: 2,539 - Follows: 2,631 - Updated: 9/15/2013 - Published: 1/1/2013
Veteran Player, Different Game
by D4RKL0RDR3V4N reviews
A new age has dawned. New alliances have formed. Old grudges have been forgotten. But darkness looms on the edges of dark space, and it has sworn none shall escape the coming fire... AU post-Halo 3, pre-Mass Effect
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 35 - Words: 56,069 - Reviews: 358 - Favs: 388 - Follows: 468 - Updated: 7/28/2013 - Published: 5/31/2012 - Fred-104, Admiral Hackett, J. Garson
Mass Effect: A New History
by Bombsquad reviews
A continuation of the 'A new Past' story arch. The Alliance and Citadel have an uneasy peace...and the Alliance's safety and security is threated from without and from within, by extremists and terrorists...and one being whose mind is subverted.
Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 7 - Words: 68,896 - Reviews: 170 - Favs: 654 - Follows: 666 - Updated: 9/8/2012 - Published: 5/23/2011 - Nihlus K.
by Real Teagy SOT reviews
Alternate Universe with the UNSC replacing the Systems Alliance. Currently post-poned if not canceled.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 11 - Words: 34,703 - Reviews: 205 - Favs: 235 - Follows: 257 - Updated: 8/28/2012 - Published: 7/10/2012 - Shepard
Mass Effect New Origins V2
by erttheking reviews
On the dawn of the 27th century, the UNSC discovers a Mass Relay, and unlock its power. What follows not only includes making contact with new species and making new friends, but making new enemies as well, and the entire galaxy will shake.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Romance - Chapters: 109 - Words: 442,687 - Reviews: 2601 - Favs: 1,852 - Follows: 1,324 - Updated: 6/9/2012 - Published: 10/5/2010 - J. Garson - Complete
The Shepard Code
by quondam reviews
Set Post-ME3 where Shepard chooses Control. A hundred years after the Reaper War, a Turian ship captained by the grandson of Garrus Vakarian comes across a derelict Reaper inhabited by a hologram of Commander Shepard.
Mass Effect - Rated: K+ - English - Chapters: 2 - Words: 7,111 - Reviews: 143 - Favs: 754 - Follows: 164 - Published: 5/5/2012 - Garrus V., Shepard - Complete