Halo Crossovers
Filters
1.5K | Page 1 2 3 4 11 .. Last Next »

Operation: GEMINI by M306117 reviews
The crew of the UNSC Butterfly have one task: find the Prophets and make them pay. And nothing, not even the fact their targets are in a parallel world, is going to stop them.
Crossover - Fallout & Halo - Rated: T - English - Adventure/Sci-Fi - Chapters: 4 - Words: 14,501 - Reviews: 8 - Favs: 16 - Follows: 21 - Updated: 2h - Published: 2/28 - Lone Wanderer
Heroes of the Stars by Kamzil118 reviews
The Arbiter and an ODST, Farseer Taldeer and Logan of the Ghost squad, and Blackburn of the 1st Recon Marines. All these people find themselves in the Mass Effect Universe with an unexpected way that brings them together. Commander Shepard will need all their help to fight the Reapers.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 25 - Words: 69,281 - Reviews: 107 - Favs: 69 - Follows: 86 - Updated: 3h - Published: 7/21/2014 - Arbiter, Rookie, Shepard (F), Tali'Zorah
Precursors Effect V2 by Ny'Kle
Rewritten version of my original story, covers my take on a Halo/Mass Effect crossover, with bits of others too. Please Read and Review. (This story is AU. Don't like, don't read, but if you read, don't complain about things not being the same as official 343i or Bioware canon and lore.)
Crossover - Halo & Mass Effect - Rated: T - English - Chapters: 1 - Words: 2,686 - Favs: 4 - Follows: 7 - Published: 6h
Never Forget by de4deye117 reviews
A rookie SPARTAN-lV surveyor is assigned by the UNSC and ONI to personally lead an investigation behind the bizarre disappearance and fabled history of a unspoken hero among a world of Pokémon from years ago. His discoveries will lead him to things that only few can even comprehend. (Sequel to Unforgotten)
Crossover - Pokémon & Halo - Rated: K+ - English - Sci-Fi/Mystery - Chapters: 13 - Words: 76,683 - Reviews: 25 - Favs: 7 - Follows: 8 - Updated: 7h - Published: 4/14 - Ash K./Satoshi, Arceus, M. Parangosky, OC
Halo: The Ori War by DX1998 reviews
7 Months Ago...the USS Odyssey vanished without a trace. Seven long months, that saw the Ori march almost unopposed through the Milky Way Galaxy. With none able to stand against them, the armies of Origin were triumphant in all battles. But now...now the Odyssey has returned, and with the aid of the UNSC and Sangheili, they will bring the fight to the Ori.
Crossover - Stargate: SG-1 & Halo - Rated: T - English - Adventure/Drama - Chapters: 11 - Words: 46,605 - Reviews: 358 - Favs: 530 - Follows: 673 - Updated: 13h - Published: 10/7/2014
HALO:Operation Stratos by UNSC Know Your Place reviews
What will happen if UNSC Infinity discover a second humanity and exact copy of sol system while investigating a forerunner signal. Will it affect the lives of the second humanity?
Crossover - Halo & Infinite Stratos/IS<インフィニット・ストラトス> - Rated: T - English - Chapters: 11 - Words: 66,380 - Reviews: 68 - Favs: 61 - Follows: 77 - Updated: 14h - Published: 5/11/2014 - SPARTAN-B312/Noble Six, T. Lasky
The Halo Effect by Agentweapon-Proelium Tempus reviews
The discovery of a massive shield world and its contents put the UNSC into high alert. More alien artefacts are uncovered here, while vastly inferior to Forerunner, Covenant and Humanity technology, they still pose a threat since no First Contact scenario ever goes according to plan. With the help of the newly established AIS, will the UNSC be able to survive this new threat?
Crossover - Halo & Mass Effect - Rated: T - English - Humor/Adventure - Chapters: 3 - Words: 9,728 - Reviews: 23 - Favs: 89 - Follows: 134 - Updated: 21h - Published: 5/5 - Master Chief/John-117, OC, Shepard (F), Admiral Hackett
Sunrider:The Shadow of Noble by EliteOp reviews
In an attempt to save a very needed piece of tech from the Covenant, Noble Six gets sent to a whole new universe. He is destined to make new allies, aid in the war of his life against a bigger enemy than the Covenant, and in the process, find himself a wonderful family. Crossover between Sunrider Saga and Halo:Reach. (Thank Skai from steam for the new image!)
Crossover - Sunrider & Halo - Rated: T - English - Romance/Sci-Fi - Chapters: 11 - Words: 18,681 - Reviews: 9 - Favs: 4 - Follows: 6 - Updated: 5/29 - Published: 5/10
Becoming Human by The Assassin's mentor reviews
Years of fighting have whittled down on Sargent Riley O'Neil "Ghost". Seeing many of his men die in front of him, they haunted him everyday. Nothing he does could ever atone for his actions. After sacrificing himself on Planet Algolis, he began his journey of becoming human again. Can a ghost become human again?
Crossover - Halo & RWBY - Rated: T - English - Hurt/Comfort/Family - Chapters: 5 - Words: 13,173 - Reviews: 50 - Favs: 96 - Follows: 125 - Updated: 5/28 - Published: 12/5/2014 - OC, Ozpin, Glynda Goodwitch
Halo: The Unexpected Quest by Dinosaur Soldier reviews
Master Chief and Arbiter took an unlikely mission in Middle-earth after the events of Halo 3.
Crossover - Halo & Hobbit - Rated: T - English - Adventure/Sci-Fi - Chapters: 15 - Words: 27,417 - Reviews: 11 - Favs: 19 - Follows: 17 - Updated: 5/28 - Published: 10/18/2014 - Master Chief/John-117, Arbiter, Cortana, Gandalf
Through the Timestream by Romans-154 reviews
In an attempt to save his fireteam, Titan Guardian Callixtus sacrifices himself to defeat Atheon but a desperate timestream opens, throwing him deep in the past, far past the Golden Age, and into a holy alien city called High Charity. Not all is right with the Past, and as the Great War rages on, time warps around them and new yet old enemies and allies will soon arise.
Crossover - Halo & Destiny - Rated: T - English - Adventure/Sci-Fi - Chapters: 9 - Words: 65,715 - Reviews: 52 - Favs: 70 - Follows: 78 - Updated: 5/28 - Published: 12/28/2014 - Master Chief/John-117, Human
Heart of the Storm by Aleixo reviews
Reach has fallen and Noble Six is all that remains on the planet. In a valiant last stand Six mysteriously finds himself in the world of another. How will he come to terms with it? What will he do? Can he overcome his loss and find peace at last? Six pairing is yet to be decided. Plan to span over whole mass effect series and possibly beyond.
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Romance - Chapters: 12 - Words: 19,454 - Reviews: 47 - Favs: 77 - Follows: 124 - Updated: 5/28 - Published: 3/4 - SPARTAN-B312/Noble Six, Garrus V., Tali'Zorah, Shepard (M)
Red Cobra by Billybobjoe47s reviews
Last time the UNSC discovered a mysterious alien artifact, the Halos came within seconds of activating. Every problem the UNSC has had in the last 50 years has been because of aliens and their blasted artifacts. So when a newly-surveyed system holds a mysterious artifact, there is great cause for worry. Operation RED COBRA is intended to remedy that worry- by any means necessary.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 10 - Words: 22,621 - Reviews: 130 - Favs: 347 - Follows: 491 - Updated: 5/28 - Published: 1/6 - Master Chief/John-117, T. Hood
Requiem's Gift by Zues Killer Productions
After the events of the last operation on Requiem, Avril, leader of fire team Crimson, is put on a separate world as a result of her trying to save the Infinity. However, this also inadvertently switches her with Idoun, former Demon dragon. With Crimson curious as to their new visitor's personality and history, and Avril in a tight spot, an foe as old as time itself wants in..
Crossover - Halo & Fire Emblem - Rated: T - English - Humor/Drama - Chapters: 7 - Words: 16,215 - Favs: 2 - Follows: 2 - Updated: 5/28 - Published: 2/27 - T. Lasky, OC, Idoun, Chrom
A Lost ODST and A Vampire by Gabrielmizore311 reviews
This is a crossover story between Rosario Vampire And Halo. It takes place in the Rosario Vampire universe But a mysterious ODST appears on the first day the same day as a new vampire appears. how will this affect the students daily life? Read and find out!
Crossover - Halo & Rosario + Vampire - Rated: T - English - Adventure/Romance - Chapters: 31 - Words: 20,412 - Reviews: 27 - Favs: 18 - Follows: 21 - Updated: 5/28 - Published: 5/12/2014 - [OC, Moka A.] [OC, Mizore S.]
The Videogame Multiverse by Darkion Silver reviews
After all of the heroes from each video game are captured, it is up to one unlikely hero to save them. To do so, he must take the role of each hero and 'play' through each game in order to save them. But a great evil is approaching, so he must - wait, where did he go? DRAGO, GET OFF THE 3DS AND GET OVER HERE.
Crossover - Super Smash Brothers & Halo - Rated: T - English - Humor/Adventure - Chapters: 11 - Words: 12,770 - Reviews: 2 - Favs: 3 - Follows: 3 - Updated: 5/28 - Published: 5/2
The Infinity Effect by creamofwheat2311 reviews
After discovering a Precursor artifact, the UNSC Infinity and the Sangheili Shadow of Intent are transported to a universe unlike anything they have ever seen, and forced into a war against a foe they never could have imagined: the Reapers. Alliances are founded, friendships are formed, and decisions are made that will change this galaxy forever. Post Halo 4, Pre ME3. AU
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 19 - Words: 196,069 - Reviews: 1664 - Favs: 1,782 - Follows: 2,230 - Updated: 5/28 - Published: 10/9/2013 - Master Chief/John-117, T. Lasky, Admiral Hackett, Shepard (M)
Destiny Trapped by Jochern reviews
The Phoenix gets flung through a wormhole and ends up in an unknown galaxy in a war between the Covenant and UNSC. They were transporting Bra'tac and Rya'c to a meeting. Colonel Jade Kavanagh knowns neutrality isn't going to hold if they want to survive in the long run and get home. Takes place after the Ori loses somewhere in the timeline.
Crossover - Stargate: SG-1 & Halo - Rated: K+ - English - Tragedy/Sci-Fi - Chapters: 9 - Words: 10,371 - Reviews: 37 - Favs: 71 - Follows: 100 - Updated: 5/28 - Published: 2/1 - Braítac, J. O'Neill, R. McKay, J. Keyes
Where Titans Tread by JLake4 reviews
As the Covenant acclimates to a much larger galaxy than they previously imagined, a Spectre returns from the dead. With the impending arrival of the Reapers and the awakening of an ancient evil, can Shepard and the Arbiter prepare the galaxy for an apocalyptic onslaught?
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Suspense - Chapters: 16 - Words: 65,143 - Reviews: 50 - Favs: 35 - Follows: 39 - Updated: 5/27 - Published: 2/13 - Arbiter, Shepard (M)
La guerra nos separo by HUNTERFANFIC reviews
Ash estudia en la UNSC pero secretamente entra a un programa Sparten, Serena no sabe nada de el pero despues se reencontraran de la forma menos esperada
Crossover - Pokémon & Halo - Rated: K - Spanish - Romance/Sci-Fi - Chapters: 1 - Words: 2,734 - Reviews: 1 - Favs: 1 - Published: 5/27
ODST or Clone? by CAPTAIN JASE S-412 reviews
A clone trooper. Just another stick in a pile of milions. What if a clone ended up fighting in the Human-Covenant war as a highly-trained "ODST"? How would he affect the war? And what would happen to the people he "left behind"? Find out here and now! -/- Re-wright of UNSC Marine? Or Clone Trooper? -/- Rating may change to M.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi - Chapters: 5 - Words: 10,264 - Reviews: 6 - Favs: 25 - Follows: 30 - Updated: 5/26 - Published: 3/28 - [Captain Rex, Ahsoka T.] A. J. Johnson, T. Hood
HALO: The Andromeda Chronicles by UH-60 NIGHTSTALKER reviews
A collection of stories, behind the stories which forever changed a Galaxy which was not so far away. Ratings may change for future chapters.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 7 - Words: 26,370 - Reviews: 70 - Favs: 80 - Follows: 96 - Updated: 5/26 - Published: 1/4
Saviours Of The Mantle by DanAbnettFan1997 reviews
The year is 2545, and mankind is on the run. Faced with the inexorable advance of the Covenant juggernaut, hope is all but lost. However, unknown to the UNSC, a deal struck millennia ago may turn the tide of the war. A deal that could yet ensure the Reclaimers their inheritance, and save the human race. For the Mantle Of Responsibility must be upheld, no matter the cost...
Crossover - Warhammer & Halo - Rated: T - English - Sci-Fi - Chapters: 2 - Words: 9,219 - Reviews: 8 - Favs: 9 - Follows: 22 - Published: 5/26 - Imperial Guard, Space Marines, OC, Master Chief/John-117
Six Times The Machine by Zaraen reviews
She was ready for her final stand. Ready to take as many as those alien bastards down as she could. Only, things didn't turn out how she expected. Death didn't claim her and now she's on the one planet they all swore to protect, but there's one difference. Someone else found it and now she's an alien to her own heritage. A machine in the eyes of this Humanity. Then there's that AI.
Crossover - Halo & Transformers - Rated: T - English - Adventure - Chapters: 12 - Words: 73,233 - Reviews: 93 - Favs: 108 - Follows: 147 - Updated: 5/26 - Published: 8/2/2014 - SPARTAN-B312/Noble Six, W. Lennox, Optimus Prime
Rite of Reclamation by Glory-To-Our-August-King reviews
15 years after the fall of the Didact, humanity struggles to survive in the wake of the Onslaught: a ruthless attack launched by ancient constructs known as Watchers. In their conquests, they have awakened Adam and the Angels, who now stand poised to wrestle the Mantle from Earth's frail grasp, and bring about mankind's Final Judgment.
Crossover - Evangelion & Halo - Rated: T - English - Sci-Fi/Mystery - Chapters: 3 - Words: 31,516 - Reviews: 1 - Favs: 4 - Follows: 2 - Updated: 5/26 - Published: 5/19
1.5K | Page 1 2 3 4 11 .. Last Next »