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Enduring the Flames of War
by Masterdude21 reviews
A joint Asari-Turian operation salvaged a "package" from a derelict wreckage in the Terminus Systems, whereupon they release a force of war beyond their reckoning. Hoping to avoid another war, Commander Shepard recruits the "package" into her team. A simple act of kindness, unwittingly paving the way for a clash unlike the galaxy has ever seen. Fate directs the flames of war.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Horror - Chapters: 41 - Words: 585,329 - Reviews: 2110 - Favs: 3,246 - Follows: 4,015 - Updated: 9/9 - Published: 11/30/2015 - Master Chief/John-117, OC, Shepard
XCOM: The Advent Directive
by Xabiar reviews
Australia has been annexed, the United Nations is in chaos, the world is under siege and the Ethereals have taken the field. Facing the full might of the Ethereal Collective, the Commander must rally XCOM, the newly formed ADVENT, and several other allies and rivals to unite the divided nations by any means necessary, for failure now will mean the fall of humanity once and for all.
X-Com - Rated: M - English - Sci-Fi/Drama - Chapters: 77 - Words: 1,751,466 - Reviews: 872 - Favs: 368 - Follows: 381 - Updated: 8/8 - Published: 5/5/2017 - Dr. Vahlen, Dr. Tygan, R. Shen, OC
by Trackhawk reviews
It became very clear that this was not your everyday Sergeant who was addressing me. No, this was the voice of complete authority. Pure and utter respect was demanded from that voice, and nothing less would do. A small shiver of fear and admiration ran through my body. Not only because of what they meant, but because of who they were delivered by. "Drew Crawford, Squad Lockdown."
X-Com - Rated: T - English - Chapters: 30 - Words: 109,997 - Reviews: 50 - Favs: 23 - Follows: 42 - Updated: 8/2 - Published: 7/28/2014 - Bradford, Big Sky, OC
The Fifth-Race Reclaimers
by Piero217 reviews
The Four Great Races once watched over thousands of worlds… but only one species was destined to inherit their place. Now, as an ancestral enemy rises from the ashes and threatens all life as we know it, humans from two different universes must learn to overcome their differences and stand together to reclaim the Mantle of Responsibility. Set shortly after the events of Spartan Ops
Crossover - Halo & Stargate: Atlantis - Rated: T - English - Sci-Fi/Adventure - Chapters: 26 - Words: 166,249 - Reviews: 264 - Favs: 427 - Follows: 451 - Updated: 1/23 - Published: 6/1/2013 - Master Chief/John-117, C. Halsey, Cortana, John S. - Complete
by wyval reviews
Humanity successfully reached for the stars, confident in their ability to conquer all who stand against them. Yet in the darkness of space, an ancient menace stirs, that could possibly eclipse all past enemies Humanity faced - including those from the depths of time they faced in the wars for Terra itself...
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi/Supernatural - Chapters: 36 - Words: 202,678 - Reviews: 128 - Favs: 217 - Follows: 252 - Updated: 12/3/2020 - Published: 7/7/2016 - Liara T'Soni, Shepard, Kai Leng
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: 63 - Words: 342,161 - Reviews: 2817 - Favs: 4,173 - Follows: 4,625 - Updated: 10/9/2020 - Published: 8/8/2014
by ResurgentClone reviews
The Lucian Alliance is defeated, the line has been held against the Wraith in orbit around Earth. Now it's time for Atlantis to yield it's secrets.
Crossover - Stargate: SG-1 & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 14 - Words: 27,003 - Reviews: 263 - Favs: 420 - Follows: 578 - Updated: 6/2/2020 - Published: 9/26/2012
XCOM: Remnant Unknown
by DrAmishMD reviews
The sequel to XCOM: RWBY Within. Teams RWBY and JNPR return to Remnant in time for the Vytal Festival. They're relieved to finally have their lives get back to normal after nine months on war-torn Earth, but is the life of a huntsman ever truly normal?
Crossover - X-Com & RWBY - Rated: M - English - Adventure/Sci-Fi - Chapters: 48 - Words: 488,809 - Reviews: 1166 - Favs: 1,250 - Follows: 1,357 - Updated: 2/20/2020 - Published: 7/22/2016 - Team RWBY, Team JNPR - Complete
Fairy Dance of Death
by Catsy reviews
AU reboot of the entire SAO storyline, beginning from the premise that Kayaba Akihiko was obsessed with magic and Norse Mythology rather than swords and pure melee. As a result, he created the Death Game of Alfheim Online rather than the floating castle of Aincrad—a world in which PvP is not a crime, and the nine player races are in competition to escape. **SPOILERS IN REVIEWS**
Sword Art Online/ソードアート・オンライン - Rated: T - English - Drama/Adventure - Chapters: 50 - Words: 696,161 - Reviews: 2627 - Favs: 4,711 - Follows: 4,809 - Updated: 1/24/2020 - Published: 11/6/2012 - Kirito/Kazuto K., Asuna/Asuna Y., Klein/Ryoutarou T., Argo
by deadliestfan reviews
Worlds collide as Azeroth and the world of Warhammer Fantasy are maneuvered into connection by scheming gods. A portal appears in Norsca, one that entities on both worlds are eager to utilize as mortals are left to deal with the consequences. The novel side of my Warhammer-Warcraft crossover.
Crossover - Warhammer & Warcraft - Rated: T - English - Fantasy/Adventure - Chapters: 8 - Words: 63,779 - Reviews: 45 - Favs: 61 - Follows: 72 - Updated: 10/11/2019 - Published: 5/27/2018
The Lost Prince Of Caledor
by PrinceOfCaledor reviews
When Imrik finds himself thrown into a world that is not his own, he meets Eragon and decides to fight at his side. it doesn't matter that they are outnumbered or that he doen't know what he is up against. He is a child of Ulthuan and he will previal.
Crossover - Warhammer & Inheritance Cycle - Rated: T - English - Fantasy/Adventure - Chapters: 14 - Words: 115,231 - Reviews: 78 - Favs: 158 - Follows: 122 - Updated: 3/10/2019 - Published: 2/21/2012 - High Elves, Arya - Complete
The Last Spartan
by DinoJake reviews
An AU fic in which the Halo and ME universes share the same galaxy. After a well deserved rest in Cryo-Sleep, Master Chief finally awakens...to a whole new galaxy.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 55 - Words: 489,686 - Reviews: 3993 - Favs: 4,187 - Follows: 4,179 - Updated: 12/31/2018 - Published: 5/2/2010 - Master Chief/John-117
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: 702 - Favs: 1,896 - Follows: 2,514 - Updated: 5/30/2018 - Published: 3/29/2016
The Rising Action
by Spc. Knox reviews
(WARNING: This is a blend between Legends and a Canon Story) The Empire always told me back in the Academy… that in order for a simple cadet to make his way into the ranks of the Empire, they had to be determined, driven, and always put their best effort to make sure the Empire comes out on top, and as a rising Imperial Officer, that is a given.
Star Wars - Rated: M - English - Sci-Fi/Adventure - Chapters: 21 - Words: 100,055 - Reviews: 16 - Favs: 37 - Follows: 37 - Updated: 4/18/2018 - Published: 4/22/2017 - Darth Vader, Thrawn, OC, O. Krennic - Complete
by Cap'n Chryssalid reviews
A fun-loving asari mercenary finds herself a little in over her head when she ends up abducted by terrifying aliens from beyond the galactic frontier. These asari-like creatures call themselves 'humans.' They seem to be secretly nosing about on the borders of known space, acting through proxies, conducting covert operations, and they've got a deal for an enterprising asari...
Crossover - X-Com & Mass Effect - Rated: T - English - Humor/Sci-Fi - Chapters: 43 - Words: 387,570 - Reviews: 1400 - Favs: 3,640 - Follows: 4,170 - Updated: 1/2/2018 - Published: 7/19/2014 - U. Wrex, Daro'Xen, J. Garson, OC
The War of Fates
by PrinceOfCaledor reviews
Sequel to Lost Prince of Caledor. Imrik of Caledor has returned to Ulthuan, Eragon continues to train and the flames of war stir in Alagaesia. As time runs thin and the Varden prepare to confront Galbatorix in the field, can Imrik gather enough support in the fickle courts of Ulthuan to return with the armies he promised? A new evil is rising, and only he can halt its growth.
Crossover - Warhammer & Inheritance Cycle - Rated: T - English - Adventure/Fantasy - Chapters: 8 - Words: 92,921 - Reviews: 84 - Favs: 151 - Follows: 168 - Updated: 12/11/2017 - Published: 11/18/2013 - High Elves, Arya, Eragon S., Saphira
The Stars Alone
by Darth Marrs reviews
Sequel to Broken Chains. Every choice has a consequence. Every action has a price. Their financial empire lost, their allies turned against them for crimes they actually did commit, Harry, Hermione and Luna are exiled from Earth. The Goa'uld have no idea what is about to hit them, because the stars alone know how far they will go.
Crossover - Stargate: SG-1 & Harry Potter - Rated: M - English - Drama/Fantasy - Chapters: 62 - Words: 287,367 - Reviews: 3485 - Favs: 2,958 - Follows: 2,886 - Updated: 10/21/2017 - Published: 7/8/2016 - Complete
The Swarm of War
by VexMaster reviews
A nerd has reincarnated as a Zerg Larva... and now he has been dropped into the Warhammer 40K. There is no time for peace. No Respite. No forgiveness. There is only WAR and the Swarm!
Crossover - StarCraft & Warhammer - Rated: M - English - Sci-Fi - Chapters: 87 - Words: 582,026 - Reviews: 2744 - Favs: 3,381 - Follows: 3,249 - Updated: 8/12/2017 - Published: 6/14/2011
Rise of the Je'daii Empire
by SaiyatonianSage reviews
Jedi and Sith, the anomalies of the Force that has caused an imbalance for millennias and now it has created the Clone Wars. Ralem Solstice, born from the Force and the Father, leader of the Je'daii Order (ancestors to the Jedi) shall bring a new dynasty to the galaxy as he brings true peace to everyone through eliminating the corrupt both in the Seperatists and the Republic.
Star Wars: The Clone Wars - Rated: M - English - Adventure/Romance - Chapters: 13 - Words: 116,857 - Reviews: 108 - Favs: 423 - Follows: 404 - Updated: 8/9/2017 - Published: 6/8/2015 - [OC, Ahsoka T., Barris Offee, R. Chuchi]
Event Horizon Book 1: Autumn's Frontier
by Spartan-168-Django reviews
The Realm is forever changed when a new player in the Game arrives: space explorers from future Earth, looking for a planet just ripe for colonization. But just what awaits the people of Earth here in the World of Ice and Fire? And how will their powerful technology and ideas transform Westeros, for better or worse? Let the adventure begin!
A song of Ice and Fire - Rated: M - English - Sci-Fi/Parody - Chapters: 114 - Words: 297,851 - Reviews: 568 - Favs: 707 - Follows: 503 - Updated: 7/28/2017 - Published: 2/1/2015 - Daenerys T./Dany, Jon S., Eddard S./Ned, Robb S. - Complete
StarGate: Galactic Imperium
by VexMaster reviews
What if someone from our universe goes to the Stargate universe with everyting we know about it? He will build an empire unlike any other before it. 1st person POV and POV from SG-1. A massive crossover!
Stargate: SG-1 - Rated: M - English - Sci-Fi/Fantasy - Chapters: 131 - Words: 786,594 - Reviews: 3347 - Favs: 2,436 - Follows: 2,267 - Updated: 7/27/2017 - Published: 1/22/2009
Terran Federation: Contact
by L4 of the WEST reviews
For more than 20 years, the Terran Federation's path into the darkness beyond Earth has been marked by war, betrayal, and bugs. Every alien they met in the blackness of space has been hostile, pushing the region on a path to another great interstellar war. But sometimes, you get lucky, will the 6th time over Shanxi be it?
Crossover - Starship Troopers & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 28 - Words: 164,615 - Reviews: 380 - Favs: 890 - Follows: 914 - Updated: 4/16/2017 - Published: 8/7/2014 - Complete
Of Math and Mountains
by Le Cinnamon Tea reviews
Behind the numbers, data, and calculating logic, there is a still a resemblance of humanity. This is their story, a collection of flashpoints during a war that spans thousands of light years. Told from the perspectives of the TEC, Vasari, and Advent alike.
Sins of a Solar Empire - Rated: T - English - Sci-Fi/Drama - Chapters: 15 - Words: 54,341 - Reviews: 36 - Favs: 25 - Follows: 37 - Updated: 1/21/2017 - Published: 2/16/2015
RWBY: Assassins Creed: Artifacts of the Grimm
by 336 reviews
Ronac Faysam is a 10 year old, Bat-Faunus, Assassin in training. Or he would be, if the Templar's hadn't found the Assassin camp in Grimm territory, steamrolled it, and obliterated the Assassin order. Now all Ronac can do is put himself back together and try to continue his fathers work as Assassin. But how? (Slow upload time.)
Crossover - Assassin's Creed & RWBY - Rated: T - English - Adventure/Tragedy - Chapters: 24 - Words: 70,366 - Reviews: 11 - Favs: 39 - Follows: 34 - Updated: 1/20/2017 - Published: 9/24/2015 - Warren V., OC, Penny P., J. Ironwood
Life as the supreme commander
by SirSaulty1995 reviews
Life took a sudden turn for one Marcus Ulysses, but despite the whole misfortunes and misery life threw his way... he wasn't expecting this. Gifted with an all powerful war machine dated back eons before the rebirth of the galaxy. Anti hero OC, Dimensional travelling, Multi crossover with multiple games, anime etc. RTS gamer powers (sort of)
Crossover - Supreme Commander & Akame ga Kiru/アカメが斬る - Rated: M - English - Adventure/Sci-Fi - Chapters: 2 - Words: 25,392 - Reviews: 23 - Favs: 92 - Follows: 94 - Updated: 1/5/2017 - Published: 11/28/2016
Of Psychics and Flying Chthulu-ships
by Dr1ft3r0I reviews
The Volunteer ended the war. Now he and the best of X-Com are stuck in a world that they don't know, surrounded by aliens that may or may not want to kill them all. Oh, and there's a giant metal cuttlefish in the sky. Starts post X-COM: EU, beginning of ME1. Not CRACK!
Crossover - X-Com & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 6 - Words: 26,036 - Reviews: 50 - Favs: 184 - Follows: 324 - Updated: 12/25/2016 - Published: 4/29/2015 - [J. Garson, Garrus V.]
by Peptuck reviews
Mankind has survived its crucible, and while scarred and changed by the Ethereals, they advance into the cosmos. The galaxy beyond is a place of wonder and terror, of wealth and strife. Amid the threats and opportunities, both within and without, XCOM remains vigilant. Mass Effect/XCOM/Eclipse Phase/FEAR/Destiny fusion.
Crossover - X-Com & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 18 - Words: 170,804 - Reviews: 424 - Favs: 1,015 - Follows: 1,112 - Updated: 9/14/2016 - Published: 9/2/2014
XCOM: RWBY Within
by DrAmishMD reviews
A strange anomaly causes the members of Team RWBY to find themselves in the midst of Earth's full-scale alien invasion with no way of returning to Remnant.
Crossover - X-Com & RWBY - Rated: M - English - Sci-Fi/Adventure - Chapters: 41 - Words: 236,948 - Reviews: 776 - Favs: 1,470 - Follows: 1,038 - Updated: 7/15/2016 - Published: 5/15/2015 - Ruby R., Weiss S., Blake B., Yang X.L. - Complete
XCOM: Enemy Among
by EasyCompany506 reviews
The First Encounter War ended with the death of the Volunteer and the destruction of the Temple Mothership. The following years have seen XCOM go through many changes and explosive growth towards independence. With the fear of the Alien menace fading XCOM must now defend itself from an old enemy from within. EU & EW. Rated T for violence, language and sexual scenes, may go to M.
X-Com - Rated: T - English - Drama/Sci-Fi - Chapters: 13 - Words: 46,481 - Reviews: 30 - Favs: 51 - Follows: 69 - Updated: 6/18/2016 - Published: 9/12/2014
Tales From The Anthill
by DrAmishMD reviews
A collection of one-off short chapters that focus on minor events throughout the storyline of XCOM: RWBY Within. Written for my own entertainment and to keep my writing skills sharp while I prepare for the eventual sequel to RWBY Within.
Crossover - X-Com & RWBY - Rated: M - English - Sci-Fi/Adventure - Chapters: 7 - Words: 25,758 - Reviews: 56 - Favs: 170 - Follows: 162 - Updated: 6/13/2016 - Published: 3/2/2016 - Ruby R., Weiss S., Blake B., Yang X.L.
Sword Art Online: The Assassin of Aincrad
by callofduty1944 reviews
Daisuke, a younger member of the Assassins, was excited to receive Sword Art Online for his birthday. However, he didn't expect for it to turn into a death game. Now it is up to him to step up when he realizes that the Templars may be involved with the turn of events. Can he and his friends eliminate the threats and find a way home? Or will the game get to them first?
Crossover - Assassin's Creed & Sword Art Online/ソードアート・オンライン - Rated: T - English - Fantasy/Friendship - Chapters: 9 - Words: 53,028 - Reviews: 31 - Favs: 95 - Follows: 102 - Updated: 4/27/2016 - Published: 1/13/2015
Silly but Killy
by Palladius reviews
What if there were no Humans in Mass Effect? What if there were Orks instead? The Council would have a lot less sleep, for one thing.
Crossover - Warhammer & Mass Effect - Rated: T - English - Humor/Sci-Fi - Chapters: 15 - Words: 47,002 - Reviews: 713 - Favs: 1,601 - Follows: 1,515 - Updated: 4/23/2016 - Published: 7/30/2014
When Civilizations Meet
by Generatedname reviews
The Ethereals, the Aquatoids, the Micronoids. Humanity has faced them all, and come out stronger. The Humans have left their world, exploring the stars, their technology built on Alien corpses. How will they react when they meet a peaceful society, one that is both advanced and primitive? ABANDONED, REWRITE IS UP UNDER THE TITLE 'THE HUMAN WAR!
Crossover - X-Com & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 17 - Words: 52,325 - Reviews: 336 - Favs: 774 - Follows: 886 - Updated: 3/29/2016 - Published: 5/11/2014 - OC
by LukkiLewin reviews
Despite being under the radar, the XCOM Project is one of the most popular subjects in modern debate. We know nearly everything of this supposedly clandestine society, and we love it. But what of XCOM's equally shadowy counterpart, EXALT? See the conflict through the eyes of this rogue organization, and you will find there's more to EXALT than fancy scarves and red hologlobes.
X-Com - Rated: M - English - Sci-Fi - Chapters: 12 - Words: 35,765 - Reviews: 7 - Favs: 13 - Follows: 23 - Updated: 2/3/2016 - Published: 7/15/2015
XCOM: From The Ashes of Temples
by Phalanx reviews
XCOM is on the verge of collapse after a devastating alien attack at the heart of its operation robs it of its leadership and core operatives. As survivors struggle to rebuild, they discover a missing weapons convoy in France and the attack on HQ are connected in a way no one imagined; the enemy is within humanity itself. EW storyline-based, with additions from the Long War Mod.
X-Com - Rated: T - English - Sci-Fi/Horror - Chapters: 20 - Words: 111,424 - Reviews: 191 - Favs: 164 - Follows: 213 - Updated: 1/1/2016 - Published: 1/1/2014
by pisces317 reviews
The gang from Atlantis meet the Doctor and Rose in a prison where they form a tentative bond in their efforts to escape. Shep whump, Doctor whump. Has been Rewritten!
Crossover - Doctor Who & Stargate: Atlantis - Rated: T - English - Hurt/Comfort - Chapters: 14 - Words: 62,496 - Reviews: 25 - Favs: 49 - Follows: 88 - Updated: 12/1/2015 - Published: 7/3/2011 - 10th Doctor, John S.
by Brian1972 reviews
The Cylons won the war and fled the nuclear wasteland that once were the 12 colonies. Between the stars they found earth and learned that not all humans hate them. A long time after unification they made contact with the Citadel. Turians were diciplined and First Contact went well until they infromed the Asari Ambasador about their history.
Crossover - Battlestar Galactica: 2003 & Mass Effect - Rated: T - English - Sci-Fi/Drama - Chapters: 5 - Words: 18,464 - Reviews: 97 - Favs: 233 - Follows: 344 - Updated: 11/2/2015 - Published: 10/15/2015
by skyfire777 reviews
After the war, XCOM was reduced to conspiracy theories and urban myths. They did not exist in any shape or form. But they were far from gone. Now, after 50 years of rebuilding, humanity faces yet another threat. Now, after 50 years of preparations, XCOM stands ready to face that threat. Covert!XCOM. Rating subject to change
Crossover - X-Com & Mass Effect - Rated: T - English - Sci-Fi/Suspense - Chapters: 5 - Words: 9,696 - Reviews: 22 - Favs: 88 - Follows: 157 - Updated: 10/11/2015 - Published: 4/18/2015
Lost Magic: First Contact
by MightyFish reviews
A man is left trapped in time, while his world dies around him. Now awakened in the distant future, he leaves the planet of his birth and embarks on a journey to find that which was lost. But the new frontier holds many dangers, and the human race is about to face its first great challenge. A HP/ME crossover. Slow pace, rated M for safety, my profile has more details.
Crossover - Harry Potter & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 10 - Words: 162,448 - Reviews: 714 - Favs: 2,467 - Follows: 3,064 - Updated: 7/25/2015 - Published: 2/4/2015 - Harry P.
Beneath Her Violet Flame
by alimination602 reviews
Dr. Vahlen inquires to a member of the X-COM military division for assistance testing her latest lab creations only to discover the true power the woman holds beneath her violet flame.
X-Com - Rated: T - English - Sci-Fi - Chapters: 5 - Words: 10,828 - Reviews: 7 - Favs: 13 - Follows: 16 - Updated: 6/27/2015 - Published: 3/18/2013
WAO: Entering the Old World
by Commissar Brackett reviews
Warhammer Apocalypse of Old or WAO is the first VRMMO to be launched. The first quarter million players that log in though will discover that the Old World is not a good place to live, especially when they are trapped there! Pre-End Times Old World
Crossover - Warhammer & Sword Art Online/ソードアート・オンライン - Rated: M - English - Fantasy/Sci-Fi - Chapters: 10 - Words: 87,865 - Reviews: 98 - Favs: 111 - Follows: 106 - Updated: 4/6/2015 - Published: 7/28/2013 - The Empire, Dwarfs, Warriors of Chaos, OC - Complete
Once Bitten, Twice Shy
by Varigos D. Vastitas reviews
Unwittingly uplifted beyond expectation by their foes, humanity not only destroyed their aggressors, but surpassed them and made their way to the stars. As Humanity expands from the Earth will they find their place in the galaxy, or will ghosts from the past come back to haunt them? (Co-writer NathanHale2.)
Crossover - X-Com & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 19 - Words: 122,522 - Reviews: 637 - Favs: 1,179 - Follows: 1,421 - Updated: 3/9/2015 - Published: 3/15/2014 - D. Anderson, Illusive Man, Councilor Tevos, Councilor Sparatus
The ONI Way
by phoenixforce50 reviews
The Assassin Templar war has continued into the 26th century, and humanity is at war with a vastly superior group of alien species known as the Covenant. Behind the looming power of ONI, there is a Templar master, behind the rebels and Insurrection, there are the Assassins, hiding among the UNSC's old enemies. As events unfold, questions will be raised and loyalties will be tested.
Crossover - Halo & Assassin's Creed - Rated: M - English - Sci-Fi - Chapters: 44 - Words: 69,801 - Reviews: 12 - Favs: 24 - Follows: 16 - Updated: 3/3/2015 - Published: 5/21/2014 - Complete
I Am Watchful I Am Necessary
by BattleshipFusou reviews
Decades have past since the Ethereals threat was defeated and humanity has emerged united and stronger than ever for the conflict it faced. Now after discovering the Prothean Archives on Mars, humanity is about to end up on a much larger stage than it ever expected to play on when yet another alien threat comes knocking. And again, X-COM stands ready to fight. ON HIATUS
Crossover - X-Com & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 9 - Words: 18,569 - Reviews: 379 - Favs: 836 - Follows: 1,132 - Updated: 2/25/2015 - Published: 9/30/2013 - Admiral Hackett
by RussianHawk100 reviews
Joshua is sucked into the world of Aincrad dressed as... Ezio? He will follow the Black Swordsman, Kirito, from the shadows to help him save all 10,000 players stuck inside... OC/?, Kirito/Asuna
Crossover - Assassin's Creed & Sword Art Online/ソードアート・オンライン - Rated: T - English - Adventure/Romance - Chapters: 3 - Words: 6,741 - Reviews: 21 - Favs: 61 - Follows: 69 - Updated: 2/21/2015 - Published: 9/22/2013 - Kirito/Kazuto K., Asuna/Asuna Y., Lisbeth/Rika S., OC - Complete
by Palladius reviews
The Ethereal assault on Earth was foiled by Colonel Jane Shepard. The Temple Ship taken intact, XCOM gained the capability to strike back against the Ethereals. However, Humans weren't the only species the Ethereals had set their sights on. For they were determined to make this cycle different.
Crossover - X-Com & Mass Effect - Rated: M - English - Sci-Fi/Family - Chapters: 38 - Words: 161,748 - Reviews: 1026 - Favs: 1,175 - Follows: 1,330 - Updated: 1/17/2015 - Published: 10/3/2013 - J. Garson, U. Wrex, Tali'Zorah, Admiral Hackett
Strange Love Found in a Strange Land
by Elodie Snape reviews
Terumi was a female bender that never adhered to the dictates of tradition of the Northern Water Tribe, and now that has landed her in Middle-Earth and aiding the Fellowship in their quest. Whilst in this land, Terumi will face dangers, trials, and love that she would otherwise never had known. Please R&R- I would like to know what you think.
Crossover - Lord of the Rings & Avatar: Last Airbender - Rated: T - English - Adventure/Romance - Chapters: 39 - Words: 54,856 - Reviews: 62 - Favs: 116 - Follows: 85 - Updated: 1/8/2015 - Published: 2/20/2013 - Boromir, OC - Complete
Boot Camp All Over Again
by Harvester of Dreams reviews
His universe no longer needs his strength. His universe no longer needs his protection. But another universe is on the brink of destruction, and he may be the key to it's survival. It is time for the angel of death and destruction to rise once again. AN: I need a good cover for the story. If you have any ideas, please PM me.
Crossover - Halo & Ender's Game series - Rated: T - English - Sci-Fi - Chapters: 7 - Words: 14,851 - Reviews: 53 - Favs: 121 - Follows: 168 - Updated: 1/5/2015 - Published: 12/7/2013 - Master Chief/John-117, Ender W.
HALO: The Andromeda War
by UH-60 NIGHTSTALKER reviews
Takes place 20 years after the first story. War drums are starting to sound once again and soon, the final battle to detremine the fate of Adromeda shall begin.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 47 - Words: 191,096 - Reviews: 1309 - Favs: 1,034 - Follows: 860 - Updated: 1/1/2015 - Published: 2/27/2013 - Complete
Harry Potter and the God-Emperor of Mankind
by Aussie Dingbat reviews
In the moment of his death, unexpected events culminate in tearing a hole in the fabric of time and sending the Emperor's soul back to his early childhood. Can the Emperor learn from his mistakes and successfully lead Humanity into a Golden Age? WH40K/HP Crossover God-Emperor!Harry
Crossover - Harry Potter & Warhammer - Rated: T - English - Sci-Fi - Chapters: 6 - Words: 18,743 - Reviews: 157 - Favs: 903 - Follows: 1,068 - Updated: 11/16/2014 - Published: 11/11/2014 - Harry P., The Emperor
Brave New World
by Moon Fox reviews
Merlin is living a wonderful life when he realizes he might not be the only survivor from Camelot. Gwaine's unexpected past and future come to light. Through science fiction and fantasy they are brought back together with Arthur and others to help save the last dragon. Knowledge of Stargate SG-1 is helpful, but not necessary.(COMPLETE)
Crossover - Merlin & Stargate: SG-1 - Rated: T - English - Drama/Sci-Fi - Chapters: 84 - Words: 328,697 - Reviews: 761 - Favs: 140 - Follows: 119 - Updated: 10/15/2014 - Published: 8/5/2013 - Merlin, Arthur, Leon, Gwaine - Complete
War of the 3rd Millenium
by Kaelha reviews
When the cruiser is pushed out of the warp due to unknown phenomenons Inquisitor Kayleck is far from pleased. She will be less pleased knowing that all psykers are maddened mumbling that His light is nil. For that would mean the throne is emptied. Or that the throne isn't occupied yet. In the grim darkness of the Koprulu sector, there is only war. Suffer not the Alien to live!
Crossover - StarCraft & Warhammer - Rated: T - English - Sci-Fi/Adventure - Chapters: 13 - Words: 50,321 - Reviews: 60 - Favs: 69 - Follows: 69 - Updated: 9/30/2014 - Published: 3/28/2014 - Terran, Inquisition, Deathwatch - Complete
by nolan85 reviews
Eons past, The Endless colonized and settled across the galaxy before mysteriously vanishing. Their legacy, nanocomputers called Dust, is the only clue to their fate. Now, the civilizations of the galaxy are locked in a bitter struggle to unlock the secrets of Dust, that is if they do not destroy themselves and each other through war.
Misc. Games - Rated: T - English - Sci-Fi/Fantasy - Chapters: 7 - Words: 7,716 - Reviews: 8 - Favs: 9 - Follows: 7 - Updated: 9/18/2014 - Published: 9/17/2012
Lord of the Rings: The Spartan Prophecy
by So-Pro Warrior reviews
It has been four years since the Battle of the Ark. The Forward Unto Dawn crash lands onto a unknown world and onboard the Dawn. The SPARTAN John-117 better known as Master Chief awakens from his sleep. He soon finds himself on a strange new world with only his old AI partner Cortana by his side. However he will soon discover that it was not chance that brought him here. But fate.
Crossover - Lord of the Rings & Halo - Rated: T - English - Adventure/Sci-Fi - Chapters: 18 - Words: 131,910 - Reviews: 242 - Favs: 526 - Follows: 387 - Updated: 9/6/2014 - Published: 4/7/2013 - Aragorn, Master Chief/John-117 - Complete
by Beastrider9 reviews
The XCOM project has failed. The Aliens seem to have won, but just because the Council says XCOM is no more, does not mean the soldiers who risked there lives will stop fighting. XCOM may be over, but if the Commander has anything to say about it, it will rise from the ashes like the Phoenix of old. Based around XCOM: Enemy Within
X-Com - Rated: T - English - Adventure/Sci-Fi - Chapters: 8 - Words: 21,970 - Reviews: 51 - Favs: 82 - Follows: 127 - Updated: 9/3/2014 - Published: 2/26/2014
Relocation and Restoration
by Boogalee99 reviews
Also with Ranger's Apprentice. Adopted from IAmAFantasyFan. Middle Earth is in trouble. The Valar decide to send help. Peter, Susan, Edmund, Lucy, Will, and Horace are all sent to answer the call. Will they be accepted? Takes place during the Fellowship. T for paranoia. Need not have read all three
Crossover - Lord of the Rings & Chronicles of Narnia - Rated: T - English - Adventure/Fantasy - Chapters: 2 - Words: 8,289 - Reviews: 31 - Favs: 28 - Follows: 41 - Updated: 8/17/2014 - Published: 8/14/2014
The Korprulu Reich
by stevebond1990 reviews
Torn from one life and cast into another. A man from our reality turned Goa'uld works his way into power, then learns why his corner of the Galaxy is left alone when his Empire is attacked by a force even the Goa'uld fear.
Crossover - Stargate: SG-1 & StarCraft - Rated: M - English - Sci-Fi - Chapters: 2 - Words: 8,022 - Reviews: 21 - Favs: 97 - Follows: 114 - Updated: 8/7/2014 - Published: 8/4/2014
Halo: The Clone Wars
by Cmdr. Gen. Marasco reviews
When a Separatist ship makes a blind jump into the Unknown Regions, the Republic follows. What they don't know is that following this ship will put them in contact with the UNSC...and change the entire course of the Clone Wars. NOT DEAD...YET
Crossover - Halo & Star Wars: The Clone Wars - Rated: M - English - Adventure - Chapters: 9 - Words: 67,257 - Reviews: 263 - Favs: 604 - Follows: 674 - Updated: 6/28/2014 - Published: 2/28/2010
Inquisitor Carrow and the Bureaucracy of Failure
by littlewhitecat reviews
Now he has been officialy declared an adult Inquisitor Carrow can start to implement his plans, turning Ancient Terra in to the God-Emperor fearing world he knows it should be, and what better place to start than with the Wizarding World? Be afraid, be very afraid...
Crossover - Harry Potter & Warhammer - Rated: T - English - Adventure/Humor - Chapters: 13 - Words: 143,355 - Reviews: 466 - Favs: 1,732 - Follows: 1,068 - Updated: 6/28/2014 - Published: 11/16/2012 - Harry P. - Complete
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: 653 - Favs: 994 - Follows: 1,283 - Updated: 4/30/2014 - Published: 12/22/2012
Brothers In Arms
by TheLastSurvivor14 reviews
Every story has a beginning and every legend has one as well. This is the story of two brothers who left the world they knew and entered a new world where war can either make you a man or break your soul. Decisions will be made among the brothers, new friendships will be forged and two new heroes will rise. [AhsokaxOC] Rated T for some scenes.
Star Wars: The Clone Wars - Rated: T - English - Adventure/Romance - Chapters: 23 - Words: 32,999 - Reviews: 8 - Favs: 42 - Follows: 24 - Updated: 4/15/2014 - Published: 4/4/2014 - Ahsoka T. - Complete
Agents Of Olympus
by captaincoulson18 reviews
Skye always knew she wasn't quite normal. But she never expected the reason why would be so godly...(Agents of SHIELD/Percy Jackson Crossover) (May contain Skyeward and Fitzsimmons in later chapters)
Crossover - Percy Jackson and the Olympians & Agents of S.H.I.E.L.D. - Rated: K+ - English - Friendship/Adventure - Chapters: 2 - Words: 3,070 - Reviews: 8 - Favs: 32 - Follows: 49 - Updated: 3/26/2014 - Published: 3/24/2014 - P. Coulson, L. Fitz, J. Simmons, Skye/Daisy J.
The Dragon King's Temple
by Kryal reviews
The spite of the spirits opened a door better left untouched. On the other hand, with Fire and Earth as one's allies, sometimes escaping is the easy part.
Crossover - Stargate: SG-1 & Avatar: Last Airbender - Rated: K+ - English - Sci-Fi/Adventure - Chapters: 12 - Words: 212,762 - Reviews: 1411 - Favs: 2,762 - Follows: 1,219 - Updated: 9/10/2013 - Published: 12/27/2011 - Complete
Fighting the Gods
by phoenix catcher reviews
Ryver/Michael Mentions of . Alteran:Harry. Clone:Harry Ryver . Harry must face the Galaxy and try to rebuild the strength of the Great Races while caring for his twin brother who has their destiny on Earth on his shoulders.
Crossover - Stargate: SG-1 & Harry Potter - Rated: M - English - Sci-Fi/Adventure - Chapters: 38 - Words: 364,566 - Reviews: 2724 - Favs: 3,181 - Follows: 3,306 - Updated: 7/22/2013 - Published: 6/16/2006 - Harry P.
by stevebond1990 reviews
Harry Potter was sent away because he was the squib brother of the Boy-Who-Lived. But now he knows the truth of his condition, and who's fault it is. He's going to Hogwarts and he's going to see Justice done.
Harry Potter - Rated: T - English - Family/Romance - Chapters: 3 - Words: 13,264 - Reviews: 84 - Favs: 324 - Follows: 475 - Updated: 5/19/2013 - Published: 5/7/2013 - Harry P., Tracey D.
Master Chief and the Order of the Phoenix
by LordCaldrin45 reviews
It's been four years since Master Chief escaped the explosion of Halo. The wreckage of the Forward Unto Dawn went through a black hole, teleporting Master Chief and Cortana to back to 1995 Earth and crash land in England, where Harry Potter is taking his fifth year. A new adventure is about to begin. Review!
Crossover - Harry Potter & Halo - Rated: T - English - Chapters: 10 - Words: 19,003 - Reviews: 257 - Favs: 333 - Follows: 415 - Updated: 5/7/2013 - Published: 7/16/2012 - Harry P., Master Chief/John-117
Inquisitor Carrow and the GodEmperorless Heathens
by littlewhitecat reviews
The Wizarding World is devastated when Harry Potter disappears from his relatives' house in mysterious circumstances during the summer after his first year at Hogwarts School of Witchcraft and Wizardry. Desperate to have their boy-hero back no matter what they really should have heeded the Muggle saying "be careful what you wish for". Crossover HP/WH40K.
Crossover - Harry Potter & Warhammer - Rated: T - English - Adventure/Humor - Chapters: 10 - Words: 55,611 - Reviews: 314 - Favs: 2,479 - Follows: 1,329 - Updated: 10/26/2012 - Published: 8/6/2012 - Harry P. - Complete
Runes of Atlantis
by Midnighter 13 reviews
Harry has a talent for languages, he learns fifteen of them before he reaches Hogwarts. Will he be able to learn the British Spell language fluently? And what other uses might that language have?
Crossover - Harry Potter & Stargate: Atlantis - Rated: T - English - Sci-Fi/Fantasy - Chapters: 8 - Words: 23,994 - Reviews: 1427 - Favs: 4,021 - Follows: 4,955 - Updated: 6/22/2012 - Published: 12/8/2010 - Harry P., Elizabeth W.
When You Can't Walk
by Jace911 reviews
When the Zerg Swarm launches a full-scale invasion of Terran space, the crew of the Firefly-class transport Serenity has a choice to make: risk their lives doing what they can to help, or stay out of the way and take what they can get in the chaos.
Crossover - StarCraft & Firefly - Rated: T - English - Sci-Fi/Western - Chapters: 3 - Words: 12,871 - Reviews: 20 - Favs: 14 - Follows: 19 - Updated: 1/4/2012 - Published: 4/21/2011 - James R., Mal
Halo: The Koprulu Sector
by bldude reviews
After the battle of installation 00 is over, the forward unto dawn drifts to an unknown planet...in the koprulu sector, where the two will find a new threat, one serious enough to threaten the entire galaxy, including earth. Delayed, procrastinating.
Crossover - StarCraft & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 6 - Words: 15,205 - Reviews: 96 - Favs: 200 - Follows: 236 - Updated: 7/15/2011 - Published: 8/18/2010 - Master Chief/John-117
XSGCOM: Terra from the Deep
by Hotpoint reviews
Crossover between SG1 and XCOM. As old enemies fall by the wayside new ones appear to challenge the Tau'ri and their allies.
Stargate: SG-1 - Rated: T - English - Adventure - Chapters: 19 - Words: 153,663 - Reviews: 412 - Favs: 766 - Follows: 657 - Updated: 5/3/2011 - Published: 1/3/2010
The God of Death
by Tyrant of the East reviews
The Death Spectres of the Adeptus Astartes have served the Imperium for nine thousand years. They are the thin line of resistance between eternal damnation and humanity. Now, one Space Marine finds himself stranded on a world called Azeroth.
Crossover - Warhammer & Warcraft - Rated: T - English - Sci-Fi/Fantasy - Chapters: 46 - Words: 273,118 - Reviews: 1492 - Favs: 1,556 - Follows: 1,336 - Updated: 2/4/2011 - Published: 1/17/2010
Precursors of Man and Void
by LordCaledus reviews
The United Nations of Man has stood for 50 years with its allies. But now a dire threat awaits, and an ancient enemy shall soon return. They wish for nothing but the death of all Mankind.
Crossover - StarCraft & Warhammer - Rated: T - English - Sci-Fi - Chapters: 2 - Words: 7,634 - Reviews: 4 - Favs: 6 - Follows: 8 - Updated: 12/14/2010 - Published: 10/22/2010
Pirates of the Ring
by Aelaer reviews
Complete. Jack, Gibbs, Anamaria, Will, and Elizabeth sail to Middle-earth; their presence can only have a direct impact on its future. POTC and LOTR. LOTR movie and book verse; follows canon established in first POTC film only.
Crossover - Lord of the Rings & Pirates of the Caribbean - Rated: T - English - Adventure - Chapters: 43 - Words: 211,801 - Reviews: 589 - Favs: 415 - Follows: 178 - Updated: 9/1/2010 - Published: 9/1/2003 - Aragorn, Capt. Jack Sparrow - Complete
March to Victory
by Trinial reviews
The war is over, but the Spartans don't know that. Desperate to find a way back into the fight, they inadvertantly stumble across ancient devices, and an alliance so old that no one remembered it ever existed.
Crossover - Halo & Stargate: Atlantis - Rated: T - English - Sci-Fi - Chapters: 4 - Words: 30,430 - Reviews: 149 - Favs: 299 - Follows: 373 - Updated: 7/8/2009 - Published: 5/1/2008
by gohkm reviews
Series based on the popular computer game, from XCom's humble beginnings to its conclusion. All comments and suggestions are welcome and appreciated.
X-Com - Rated: T - English - Adventure/Sci-Fi - Chapters: 20 - Words: 97,952 - Reviews: 51 - Favs: 32 - Follows: 22 - Updated: 3/12/2007 - Published: 3/22/2003
XCOM: The Unknown Menace
by Hobbes reviews
This is my take on the story of the First Alien War (1999-2003), following the plot of UFO Defense. THE STORY IS COMPLETE - Warning: Some of the reviews contain major spoilers!
X-Com - Rated: T - English - Sci-Fi/Adventure - Chapters: 36 - Words: 368,094 - Reviews: 116 - Favs: 155 - Follows: 66 - Updated: 12/29/2002 - Published: 4/5/2001 - Complete
Rings of Fate reviews
In an alternate universe where the Halo arrays were fired, the surviving group of humans and Covenant reach the Stargate Universe. They will fight for their very survival...but hey, we're used to it by now.
Crossover - Stargate: SG-1 & Halo - Rated: M - English - Sci-Fi/Adventure - Chapters: 1 - Words: 426 - Reviews: 4 - Favs: 11 - Follows: 24 - Published: 4/24/2015