Halo and Mass Effect Crossovers
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The Unknown Defender by Gabenator5 reviews
While Shepard is closing in on Saren, something odd is happening in the Terminus systems. A new faction stirs, its green-clad enforcers seemingly unstoppable. Rumors spread, pirate bases going dark, both the enslaved and kidnapped alike are discovered free. Who are these new interlopers and what is their goal? For good or ill the powers that be intend to find out.
Rated: T - English - Adventure/Sci-Fi - Chapters: 18 - Words: 121,911 - Reviews: 1263 - Favs: 3,330 - Follows: 4,224 - Updated: 1/16 - Published: 9/27/2016 - Master Chief/John-117, Cortana, Tali'Zorah, Leviathan
All the Stars by BlueWay reviews
When the Long Night of Solace is evaporated over Reach via the weaponized usage of a Slipspace Drive, it ferries with it in its swallowed sections the Covenant Empire and, more horrifyingly, the desperate measures that the UNSC used to fight them. When they are found in a universe on the precipice of their own history, the meaning of the term "Mass Effect" will change forever.
Rated: T - English - Sci-Fi/Adventure - Chapters: 38 - Words: 670,075 - Reviews: 1039 - Favs: 1,429 - Follows: 1,757 - Updated: 1/13 - Published: 6/8/2018 - SPARTAN-B312/Noble Six, Rookie
Spectre by blackshamrock333 reviews
Ce qui ne devait être qu'une simple mission de récupération, pour la commandante Shepard de l'UNSC, a rapidement tourné au cauchemar. Désormais, l'humanité et la citadelle sont au bord de la guerre, inconscient qu'un danger bien plus grand les guette. Deux Shepard ne seront pas de trop pour cette mission.
Rated: T - French - Adventure - Chapters: 9 - Words: 25,302 - Reviews: 7 - Favs: 7 - Follows: 10 - Updated: 1/12 - Published: 9/12/2021
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.
Rated: T - English - Sci-Fi - Chapters: 2 - Words: 3,304 - Reviews: 29 - Favs: 122 - Follows: 202 - Updated: 1/11 - Published: 1/7
Halo: A New Journey by mgarner3199 reviews
Master Chief wakes up in the Mass Effect universe and joins Commander Shepard in an effort to stop the Reapers. With time running out, can they stop the extinction of every species, or will they fade into legend?First, they got to stop the Reapers though...
Rated: K - English - Sci-Fi/Romance - Chapters: 2 - Words: 1,571 - Reviews: 12 - Favs: 21 - Follows: 49 - Updated: 1/10 - Published: 12/7/2021 - Cortana, Master Chief/John-117, Illusive Man, Shepard
Accounts of the Flood conflicts by hunter 139 reviews
A multicrossover series of one-shots depicting several franchises and their encounters with the Flood. I do not own Halo or any other franchises depicted in these stories.
Rated: T - English - Horror/Sci-Fi - Chapters: 40 - Words: 98,854 - Reviews: 203 - Favs: 162 - Follows: 173 - Updated: 1/8 - Published: 1/15/2015 - Gravemind
The Reclamation 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.
Rated: T - English - Adventure/Sci-Fi - Chapters: 53 - Words: 402,127 - Reviews: 1603 - Favs: 1,664 - Follows: 2,078 - Updated: 1/6 - Published: 3/13/2013
Voyage unto Infinity by supertruckin reviews
The USS Voyager comes face to face with the massive ship that is the UNSC Infinity after Voyager's nearly fatal first test of their quantum slipstream drive. Getting home isn't their only issue. They will have to work together in order to unravel the ancient threat that plagues the new galaxy that they find themselves in. Star Trek:Voyager, Mass Effect, and Halo triple crossover
Rated: T - English - Sci-Fi/Adventure - Chapters: 15 - Words: 79,399 - Reviews: 597 - Favs: 1,466 - Follows: 1,931 - Updated: 1/2 - Published: 4/10/2019 - Master Chief/John-117, Cortana, Shepard
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.
Rated: T - English - Sci-Fi/Adventure - Chapters: 16 - Words: 81,162 - Reviews: 539 - Favs: 1,602 - Follows: 2,426 - Updated: 12/27/2021 - Published: 7/26/2019 - Master Chief/John-117, Cortana, Zaeed M., OC
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.
Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 5,005 - Reviews: 25 - Favs: 157 - Follows: 240 - Published: 12/26/2021 - OC, Tali'Zorah, Admiral Hackett, Rael'Zorah
An Old Machine's New Home by Edgeoftoday reviews
A Reaper is launched from it's home galaxy during one of their many cycles, and spends countless years floating through the empty void of space. It's unintended destination results in the nearly destroyed machine unknowingly put in the middle of a galactic war between a coalition of religeous zealots and an ambitious race expanding over the stars. Picks up at the start of Halo: CE.
Rated: T - English - Sci-Fi/Adventure - Chapters: 6 - Words: 29,509 - Reviews: 70 - Favs: 236 - Follows: 336 - Updated: 12/25/2021 - Published: 8/22/2020 - Master Chief/John-117, Arbiter, J. Keyes, Cortana
A Halo Effect Challenge by FallenDispair reviews
For a writer looking for a Halo/Mass Effect crossover idea. Free range use of what's inside. Details and new combined timeline of the two universes.
Rated: T - English - Chapters: 1 - Words: 11,833 - Reviews: 4 - Favs: 14 - Follows: 14 - Published: 12/20/2021
The Truth About What It Means To Be Alive by FreedomOfThinking reviews
He's the last of his kind, and he's way out of his time. Waking up to a universe under the control of a despotic Artificial Intelligence was the last thing he expected. But the good news for him is that our favorite red-haired commander is all-inclusive and totally supportive of anyone, human or alien. Even if he's kinda responsible for the whole Reaper thing... whoops.
Rated: T - English - Humor/Adventure - Chapters: 5 - Words: 40,276 - Reviews: 50 - Favs: 215 - Follows: 311 - Updated: 12/16/2021 - Published: 4/10/2019 - Librarian, Didact, OC, Shepard
Immortal Galaxies by Lighting wolf knight reviews
An escape from an overrun galaxy lands them in another galaxy? What does being the biggest fish in the water gain you in a world without heavy hitters? Rated T for violence, death, and profanity.
Rated: T - English - Romance/Adventure - Chapters: 2 - Words: 1,964 - Reviews: 5 - Favs: 49 - Follows: 78 - Updated: 12/2/2021 - Published: 11/11/2021 - [OC, Vetra N.] T. Hood
Star League of the Orion Arm Codex by Reichenfaust reviews
Megaverse. A grand vision, on how Mass Effect, and others will be affected by a humanity forged from the influences of 1980's-2000's Sci-Fi and such. How will the Citadel deal with a humanity that has seen and has Cyborgs, Super-Soldiers, BattleMech's, WarShips, with more to come? Will contain dossiers on factions, weapons, characters, and such as we go.
Rated: T - English - Sci-Fi/Fantasy - Chapters: 3 - Words: 73,229 - Reviews: 39 - Favs: 143 - Follows: 156 - Updated: 11/26/2021 - Published: 12/25/2016
Heroes UNITE! by So-Pro Warrior reviews
Commander Shepard and his team have gathered together the races of their Galaxy in an effort to defeat the Reapers. But is it enough? When the team comes across a strange woman they find out that if they are to truly defeat the Reapers once and for all. They will need all the help they can get. But not from their Universe. Multiverse Crossover! Chapters 6-22 Being Rewritten!
Rated: T - English - Adventure/Sci-Fi - Chapters: 47 - Words: 1,478,254 - Reviews: 854 - Favs: 367 - Follows: 367 - Updated: 11/15/2021 - Published: 6/21/2013 - Master Chief/John-117, Shepard
Catalog of War by hunter 139 reviews
A collection of one shots about events, including battles, conflicts and skrimishes, that occur in the shared multiverse of my stories. I do not own any of the franchises that appear in this series. Multicrossover.
Rated: T - English - Sci-Fi - Chapters: 28 - Words: 67,362 - Reviews: 25 - Favs: 37 - Follows: 35 - Updated: 11/13/2021 - Published: 4/21/2015
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.
Rated: T - English - Sci-Fi - Chapters: 13 - Words: 80,854 - Reviews: 497 - Favs: 1,479 - Follows: 2,079 - Updated: 10/14/2021 - Published: 12/27/2018 - Master Chief/John-117, Arbiter, J. Garson, Councilor Tevos
Faction Death Battle by Konradoziom reviews
Death Battle, but between factions. Factions may not necessarily come from the HALO or MassEffect universes. You can ask fort factions you want to fight with each other in the comments. I found something like that on YouTube and decided to do it myself, on fanfiction, although on YouTube it was called otherwise, 'Faction Compare', I think.
Rated: K+ - English - Fantasy/Sci-Fi - Chapters: 3 - Words: 5,100 - Reviews: 14 - Favs: 13 - Follows: 9 - Updated: 10/13/2021 - Published: 4/19/2021
Mass Effect: Wayward Souls (rewrite pending) by ChroniclerofChaos07 reviews
No one knew what would really happen when the slipspace bomb detonates. All they know is that whatever gets caught in it would be sent to "oblivion". No one expected what would happen when you mess with the 11 dimensions of splipspace. Now Noble Six faces a new galaxy along side two other "Six's", three Jorge's, a surviving team of ODSTs, and the sole survivor of The Savannah.
Rated: T - English - Sci-Fi - Chapters: 3 - Words: 19,484 - Reviews: 43 - Favs: 193 - Follows: 287 - Updated: 10/4/2021 - Published: 3/17/2021 - Jorge-052/Noble Five, SPARTAN-B312/Noble Six, Shepard
Reckoning of the Reclaimers (v2) by metts101 reviews
After the Great War Humanity was a different creature. Their brush with extinction left them cold and vengeful, and so they sought revenge for the transgressions of the Covenant species. With their eradication Humanity, driven by xenophobia, took their position as the unrivalled power in the galaxy. However, will a xenophilic alien federation, in a new galaxy, change their outlook?
Rated: T - English - Sci-Fi - Chapters: 1 - Words: 11,625 - Reviews: 20 - Favs: 161 - Follows: 234 - Published: 9/24/2021
Reckoning of the Reclaimers (Being Rewritten) by metts101 reviews
The Great War turned Humanity into something ugly. Their species' brush with extinction left a bitter taste in their mouths and they sought to rectify that the only way they knew how. Revenge. With the the subjugation of the Former Covenant species Humanity vowed never to fall to the alien again, but will an Alliance of Alien species change their outlook on the galaxy?
Rated: T - English - Sci-Fi - Chapters: 6 - Words: 41,721 - Reviews: 75 - Favs: 280 - Follows: 374 - Updated: 9/22/2021 - Published: 11/14/2020
Ascendant by evevee reviews
A single ship can change a galaxy. The Normandy had already proven that, yet much like that vessel this new wreck was also dead. So it seemed at first at least, but just because something is dead does not mean it is forgotten.
Rated: K+ - English - Sci-Fi - Chapters: 5 - Words: 38,561 - Reviews: 205 - Favs: 585 - Follows: 649 - Updated: 9/18/2021 - Published: 8/21/2021 - Liara T'Soni - Complete
Rookies return by predator1701 reviews
Its been eight years since the end of the Reaper War, ten years since the creation of the Coalition. Now after many years of rebuilding Rookie is called back to command the Coalitions' latest exploration vessel. His mission, to explore strange new worlds, to seek out new life and new civilizations to boldly go into battle where none have battled before
Rated: T - English - Sci-Fi/Romance - Chapters: 1 - Words: 5,263 - Reviews: 1 - Favs: 10 - Follows: 10 - Published: 8/2/2021 - Complete
Once a Rookie, Always a Rookie by Twisted Fate MK 2 reviews
(Credit to Adrasos on Archive and his story, Prepare to Drop, for the idea.) On the way down to New Mombasa, Rookie falls into the Slipspace Rupture and ends up crashing down on Menae, high above Palaven, while Shepard tries to find and rescue the new Primarch. From there, the war itself will shift and the fighting persists, but who knows what an ODST will add to the mix.
Rated: T - English - Adventure - Chapters: 62 - Words: 293,819 - Reviews: 586 - Favs: 1,075 - Follows: 1,348 - Updated: 7/31/2021 - Published: 9/27/2018 - Rookie, Shepard, Javik - Complete
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