Halo Crossovers
Filters
3.4K | « Prev Page 1 2 3 4 5 12 .. Last Next »

Only in Death Does Duty End by Cypher1597 reviews
Spartans are instruments of war. They are molded, shaped, and bred to spill the blood of humanities countless enemies in the defense of mankind. They are not peacekeepers. They are not peacemakers. But duty alone will force a single Spartan to uphold a fragile peace or watch everything humanity could one day achieve burn. On the blood of their fathers and the blood of their sons.
Crossover - Halo & High School DxD/ハイスクールD×D - Rated: M - English - Supernatural/Suspense - Chapters: 3 - Words: 21,332 - Reviews: 22 - Favs: 117 - Follows: 153 - Updated: 12/15 - Published: 12/3 - OC
Mantle Of Responsibility by GeorgeQuartz reviews
10 Years after the Human-Covenant war and an Alliance between the Sangheili and Humanity keeps that Milky Way stable, soon though, a dead battlefield is discovered and the discovery encounter leads to UNSC military forces being deployed to the edge of the Andromeda Galaxy, also known as... The Outer Rim. Ongoing (21BBY & 2564 AD Story start year)
Crossover - Halo & Star Wars - Rated: T - English - Sci-Fi - Chapters: 26 - Words: 236,230 - Reviews: 386 - Favs: 875 - Follows: 1,006 - Updated: 12/14 - Published: 6/17/2020 - Ahsoka T., Fives, Rookie, OC
Empires Unite! Milky Way by SapphireDawn11709 reviews
When the SGC Destroys the Quantum Mirror after the incident were Doctor Carter and Major Kawasaki appear in Area 51a ripple was sent across the multiverse. When this ripple hit a Forerunner portal chaos ensues as fleets from three universe appear in the Milky Way. Starship Troopers, Mass Effect, Halo Stargate
Crossover - Stargate: SG-1 & Halo - Rated: M - English - Sci-Fi - Chapters: 5 - Words: 19,869 - Reviews: 57 - Favs: 227 - Follows: 279 - Updated: 12/14 - Published: 6/24/2019 - T. Lasky, S. Carter
World Eater by ArmadaScream reviews
Remnant is a land full of dangers. Filled with dark creatures, heartless beasts and vicious evil. Yet even so the world keeps turning and its inhabitants live their day to day life. But now an extraterrestrial plague has found its way onto the planet Remnant, and the Flood is coming.
Crossover - Halo & RWBY - Rated: T - English - Suspense/Adventure - Chapters: 3 - Words: 22,621 - Reviews: 24 - Favs: 34 - Follows: 50 - Updated: 12/14 - Published: 11/19 - Team RWBY, Ozpin, Pyrrha N., Gravemind
The Spartan and the Legionarie by Lighting wolf knight reviews
A spartan, the pinnacle of the human race. Thrust into a new world, full of new enemies, bonds and monsters. Rated T for violence, death, and profanity. Different characters and AU. Next chapter is 1100 words, Not 1500.
Crossover - Halo & RWBY - Rated: T - English - Romance/Adventure - Chapters: 37 - Words: 122,051 - Reviews: 42 - Favs: 144 - Follows: 180 - Updated: 12/14 - Published: 5/1/2021 - [OC, Pyrrha N.] SPARTAN-B312/Noble Six, J. Ironwood
Bellum Terranum by F35B reviews
By 2570 the Milky Way was on the track towards healing from the conflicts that plagued the Orion Arm. However, the final remnants of Storm Covenant have led the Humans/Terrans and their Sangheili Allies to a new artifact on the old Human Colony of New Shanxi, whilst the Council is still amid the Geth Conflicts. The bandaid of the Milky Way will be ripped off, revealing deep wounds.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 2 - Words: 10,008 - Reviews: 157 - Favs: 355 - Follows: 543 - Updated: 12/12 - Published: 7/31
Ides of War:The Fall of Reach by Johnnieboy11 reviews
As NOBLE Team still reels from the loss of one of their comrades, a new member, familiar to the Second-In-Command, joins the ranks of the Spartans for their most dangerous mission yet. Sakura Yamauchi, meanwhile, never thought she would be in such a mess, ever. After her death, she awakes in a new world and, now, twenty years later, is set to defend it whilst seeking someone out...
Crossover - Halo & I Want To Eat Your Pancreas/君の膵臓をたべたい - Rated: M - English - Romance/Sci-Fi - Chapters: 2 - Words: 6,000 - Reviews: 3 - Favs: 14 - Follows: 15 - Updated: 12/12 - Published: 9/10
An Artificial Life by Grocamol reviews
What do you do when so much is thrown at you? What do you do when YOU wake up as an A.I.?
Crossover - Halo & Youjo Senki: Saga of Tanya the Evil - Rated: T - English - Chapters: 2 - Words: 4,390 - Reviews: 24 - Favs: 154 - Follows: 226 - Updated: 12/12 - Published: 12/3 - Cortana, SPARTAN-B312/Noble Six, Tanya
The Rook by Twisted Fate MK 2 reviews
On the way down to New Mombasa, Rookie falls into the Slipspace Rupture and ends up crashing down on Menae, high above Palaven, right in the midst of the Reaper War. From there, the war itself will shift and the fighting persists, but who knows what an ODST will add to the mix. (Redo of an older story)
Crossover - Halo & Mass Effect - Rated: M - English - Adventure - Chapters: 14 - Words: 50,152 - Reviews: 124 - Favs: 460 - Follows: 684 - Updated: 12/12 - Published: 7/8/2022 - Rookie, Shepard
New Era II by martinantab reviews
The war has ended and UNSC/UEG can finally start with rebuilding. Former Covenant races created new alliance to prevent another big war. Everybody thought that they can live peacefully, but few years later UNSC Gargantua has discovered mysterious object in the Orion's arm and no one is sure, if everything will be the same again.
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Humor - Chapters: 5 - Words: 33,264 - Reviews: 42 - Favs: 166 - Follows: 249 - Updated: 12/11 - Published: 10/28 - Master Chief/John-117, T. Lasky, Councilor Tevos, Councilor Valern
HALO: Galactic Incursion by floodrisk07 reviews
On a newly established outer colony world of Charis, first contact is made with the Imperials after their hunt for Alderaanian refugees. In an act of hostility, the Imperials glass the planet purging any survivors. What they did not expect was a war against the UNSC and allied Sanghelli of the mysterious Milky Way. (CUSTOM COVER). Ch 3 in prog.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi - Chapters: 2 - Words: 9,284 - Reviews: 41 - Favs: 142 - Follows: 196 - Updated: 12/11 - Published: 10/16
Project Atlas by Masso 2010 reviews
The Spartans are trained to be unthinking, unflinching and unmoving in the face of the impossible. Project Atlas is so much more, when humanity looks up into the sky they can see Hope, Justice, Reverence. When those that seek to hurt humanity look up into the sky, they see the warrior, the monster, the demon. To those who seek the destruction of humanity, he is the Cataclysm.
Crossover - Superman & Halo - Rated: M - English - Adventure/Sci-Fi - Chapters: 24 - Words: 175,083 - Reviews: 221 - Favs: 464 - Follows: 544 - Updated: 12/11 - Published: 4/17/2022 - Clark K./Kal-El/Superman, Master Chief/John-117
The Song of Infinity by Johnnieboy11 reviews
As the battle of Christophsis is ongoing, a new faction emerges over the crystalline battlefield. Confusion, worry and fear permeate the Republic lines until a first shot is fired in anger by the Confederacy. A change stirs in the Force, the Reclaimers are awakening and the Galaxy at large is powerless to stop them.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 18 - Words: 72,030 - Reviews: 136 - Favs: 593 - Follows: 753 - Updated: 12/10 - Published: 3/23 - Anakin Skywalker, Ahsoka T., Master Chief/John-117, T. Lasky
Divergent Warriors Rise Of The Hunter by BeeSamusnChief reviews
Alternate version of Different Galaxies Same Fighting Hearts. After destroying the first Halo, Master Chief on his way to warn Earth of the incoming Covenant invasion. On his Journey he accidentally enlists an extraordinary toddler to join him in the war against the Covenant.
Crossover - Halo & Metroid - Rated: M - English - Drama/Family - Chapters: 3 - Words: 81,292 - Reviews: 2 - Favs: 12 - Follows: 21 - Updated: 12/9 - Published: 9/8 - Master Chief/John-117, Samus A.
The Last Metroid by Two Dudes and a Dream reviews
Her Metroid DNA had taken over, resulting in a monstrous transformation. Unable to control her powers, when attempting to escape ZDR, her ship loses power due to her actions. She can't remember what happened after that, but now, all she sees is the blackness of space, left drifting, alone. In the distance, the broken body of a frigate is seen, with the name of Forward Unto Dawn…
Crossover - Metroid & Halo - Rated: M - English - Sci-Fi/Suspense - Chapters: 37 - Words: 169,071 - Reviews: 342 - Favs: 376 - Follows: 515 - Updated: 12/9 - Published: 9/20/2022 - Samus A., Adam, Master Chief/John-117, Cortana
BattleTech: Combat Evolved - Definitive Edition by IX404 reviews
We all know the tale. The SLDF under Aleksandr Kerensky's command leaves the Inner Sphere forever, before evolving into the Clans following Operation KLONDIKE. What if this was not the case? What if the entire Exodus fleet suffered a misjump that propelled them into another universe, one where Humanity will reclaim an ancient inheritance? This is the story of that possibility.
Crossover - Mechwarrior/Battletech & Halo - Rated: T - English - Sci-Fi/Drama - Chapters: 7 - Words: 62,347 - Reviews: 54 - Favs: 145 - Follows: 177 - Updated: 12/9 - Published: 8/24 - Master Chief/John-117, Arbiter, 343 Guilty Spark, C. Halsey
The Sins of our Fathers by MarkerMagnum reviews
Unknown to the Citadel Council, the Human-Covenant war nears its vicious end. Miranda Keyes is seconds too slow. Delta Halo fires, leaving UNSC space as a lifeless snapshot in time. The Citadel must morn the loss of a civilization they never knew.
Crossover - Halo & Mass Effect - Rated: T - English - Drama/Sci-Fi - Chapters: 11 - Words: 108,395 - Reviews: 481 - Favs: 1,331 - Follows: 1,799 - Updated: 12/7 - Published: 2/11 - Cortana, Councilor Valern, Councilor Tevos, Councilor Sparatus
A Huntress In A Demon's World by Rajin Kaijun reviews
Awakening on a strange ringworld occupied by The Banished hellbent on destroying humanity, Ruby Rose joins the Master Chief and his new AI companion in hopes to not only defeat this new threat but also finding a way back to Remnant. This isn't Remnant anymore, she has to play by Halo's rules. (Slight AU Infinite)
Crossover - Halo & RWBY - Rated: M - English - Sci-Fi/Adventure - Chapters: 6 - Words: 26,562 - Reviews: 24 - Favs: 111 - Follows: 172 - Updated: 12/7 - Published: 8/9/2022 - Master Chief/John-117, Ruby R., Atriox, Cortana
Noble 6: Ghost of Reach by thermalsnipern7 reviews
The war against the Covenant ended, but something else pressed humanity to the verge of extinction like they never did. Now, Noble 6 rises again to defend humanity like he had done before, and make humanity into something strong like it was so long ago. The one thing his enemies keep wondering is why they hear boss music.
Crossover - Halo & Destiny - Rated: M - English - Sci-Fi/Romance - Chapters: 10 - Words: 45,488 - Reviews: 34 - Favs: 119 - Follows: 141 - Updated: 12/7 - Published: 7/31/2022 - [SPARTAN-B312/Noble Six, Fallen]
Halo: Un cuento de los Siete Reinos by Freakman Vityaz reviews
En el año 2559/296 D.C., el UNSC inicia la colonización del recien descubierto sistema estelar "Omega Ascalon" en un intento por evacuar a supervivientes de los ataques de "Los Desterrados". Mientras tanto, en el continente occidental del planeta, sus habitantes pronto enfrentarán el cambio de reglas en el "Juegos de Tronos", cuando un lobo solitario vuelve al servicio activo.
Crossover - Halo & A song of Ice and Fire - Rated: M - Spanish - Sci-Fi/Fantasy - Chapters: 9 - Words: 84,839 - Reviews: 31 - Favs: 20 - Follows: 36 - Updated: 12/6 - Published: 2/12 - SPARTAN-B312/Noble Six
The Spartan and The Heiress by ArmadaScream reviews
After destroying the Flood and escaping the Ark Master Chief and Cortana find themselves on a strange new world where monsters roam freely, and magic truly exists. Together with Weiss Schnee, a huntress in training the unlikely trio will fight the forces of evil and save the world.
Crossover - RWBY & Halo - Rated: T - English - Adventure/Fantasy - Chapters: 5 - Words: 21,818 - Reviews: 19 - Favs: 87 - Follows: 136 - Updated: 12/6 - Published: 3/21 - Weiss S., Master Chief/John-117, Cortana, Team RWBY
The Spartan Hero by SilverExcel115 reviews
The mission's changed, they always do. Sam wasn't expecting entering another world with no possible way back, but his missions objectives remain the same, "Protect humanity, no matter the cost." At the same time, he will be forced to come to terms with his new home and learn what it means to be a hero in this new world. At least he doesn't have to do it alone. Sam and Big 3, C-2A
Crossover - Halo & My Hero Academia/僕のヒーローアカデミア - Rated: T - English - Sci-Fi/Drama - Chapters: 10 - Words: 64,430 - Reviews: 99 - Favs: 258 - Follows: 327 - Updated: 12/5 - Published: 2/16/2022 - Samuel-034, Mirio T., T. Amajiki, Nejire Hado
HaloGears of War:: Gears Into The Outer Frontier by Spec-Op Marine 117 reviews
The Locust War on Sera was supposed to end. for good but a discovery of a mysterious alien artifact in Azura teleported Marcus and the Gears off to another universe, the world of Reach, The Gears found themselves drawn into something more significant than ever, another one had just begun. New allies, the Spartans. A new enemy and a new war to fight. A New Fight.
Crossover - Halo & Gears of War - Rated: M - English - Adventure/Sci-Fi - Chapters: 4 - Words: 15,764 - Reviews: 29 - Favs: 32 - Follows: 37 - Updated: 12/5 - Published: 7/19 - SPARTAN-B312/Noble Six, Marcus F., Anya S.
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: 26 - Words: 144,688 - Reviews: 155 - Favs: 317 - Follows: 469 - Updated: 12/4 - Published: 2/21/2022
Freedoms Binds by kivey reviews
You want and wish. People always say watch what you wish for. Will this wish lead to ruin, or turn out to be what he always dreamed? Sometimes you don't make a wish, and yet an invisible seemingly heartfelt one exists. Is this really what you want? You might not have said it but are you ready to face it?
Crossover - Harry Potter & Halo - Rated: M - English - Chapters: 3 - Words: 4,313 - Reviews: 6 - Favs: 19 - Follows: 23 - Updated: 12/3 - Published: 9/5/2015
3.4K | « Prev Page 1 2 3 4 5 12 .. Last Next »