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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: 379 - Favs: 865 - Follows: 991 - Updated: 4h - 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: 54 - Favs: 217 - Follows: 269 - Updated: 9h - 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: 19 - Favs: 27 - Follows: 44 - Updated: 12h - 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: 41 - Favs: 141 - Follows: 177 - Updated: 18h - Published: 5/1/2021 - [OC, Pyrrha N.] SPARTAN-B312/Noble Six, J. Ironwood
The Iron Cross by Lighting wolf knight reviews
Scattered, in a world where their emperor never existed... The Ultramarines have but one purpose... Protect humanity and act among them. Rated T for violence, death, and profanity. Please ignore the latest review. I have blocked that user for insulting words and feelings i do not support.
Crossover - Warhammer & Halo - Rated: T - English - Adventure/Romance - Chapters: 41 - Words: 140,707 - Reviews: 82 - Favs: 185 - Follows: 231 - Updated: 12/13 - Published: 7/15 - Space Marines, OC, Arbiter, Linda-058
Homeward Bound:The Human-Covenant War by Johnnieboy11 reviews
As the Human-Covenant War rages on in the year 2552, the UNSC gathers the best of its SPARTANs on Reach in a final bid to buy themselves time against the tide of the Alien Hegemony.. In the meanwhile, a Patrol Ship orbiting the outer areas of the Epsilon Eridani system finds an unknown vessel as it floats aimlessly. Aboard it may be the key to saving humanity, second to Chief.
Crossover - Halo & SIGNALIS - Rated: T - English - Angst/Sci-Fi - Chapters: 19 - Words: 94,707 - Reviews: 47 - Favs: 139 - Follows: 174 - Updated: 12/13 - Published: 2/7 - [Elster/LSTR-512, Ariane Yong] Master Chief/John-117, Cortana
The Sword of the Geth by Doctor poo and the TURDIS reviews
Dying on Mantle's Approach, Cortana wakes up in an unfamiliar environment. In her drive to get home, she 'employs' the assistance of the local synthetics. She never wanted to be a galactic overlord. But a UNSC AI in an environment woefully unprepared for one of her caliber makes an easy one.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Humor - Chapters: 13 - Words: 53,163 - Reviews: 246 - Favs: 529 - Follows: 766 - Updated: 12/12 - Published: 11/23 - Cortana, Shepard
Bellum Terranum by F35B reviews
In the year 2585 the Humans have mostly recovered from the effects of the Human-Covenant War, however unknown to them, there is a much larger Galaxy out there... one that doesn't take kindly to humanity and their... antics... However an old threat still lays out there, ready to strike. Pls Read & Review (Slight HFY)(AU)
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 2 - Words: 10,033 - Reviews: 157 - Favs: 346 - Follows: 521 - 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: 20 - Favs: 113 - Follows: 172 - Updated: 12/12 - Published: 12/3 - Cortana, SPARTAN-B312/Noble Six, Tanya
Relic of the Past by A Salty Archer reviews
"To dream is to be willing to sacrifice. To prevent those sacrifices from becoming too high is to fight. But you cannot fight and win by yourself. So I ask you: how much are you willing to sacrifice to make those dreams a reality?"
Crossover - Halo & Arknights - Rated: M - English - Chapters: 6 - Words: 56,485 - Reviews: 50 - Favs: 125 - Follows: 206 - Updated: 12/12 - Published: 11/9 - Master Chief/John-117, Doctor
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: 122 - Favs: 456 - Follows: 673 - 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: 36 - Favs: 145 - Follows: 220 - 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 soon causing all-out war with the residents of the Milky Way, the UEG, and ex-covenant species to break out. set during the POST-WAR era and A New Hope. (CUSTOM COVER). CHRISTMAS HIATUS brb.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi - Chapters: 2 - Words: 9,284 - Reviews: 41 - Favs: 128 - Follows: 181 - 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: 209 - Favs: 456 - Follows: 537 - 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: 584 - Follows: 737 - 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: 11 - Follows: 20 - Updated: 12/9 - Published: 9/8 - Master Chief/John-117, Samus A.
ARES:The Gods of War by Johnnieboy11 reviews
Mankind's Greatest Hero has finished his mission once more. Saving Earth from the Didact and his weapon of mass-recruitment, the Composer, the Master Chief and his AI companion, Cortana, find themselves mysteriously transported to a strange variation of Earth, where machines rule the surface and mankind hides below. The SPARTAN and those that join will fight to Reclaim the world...
Crossover - Halo & Goddess of Victory: Nikke - Rated: T - English - Adventure/Sci-Fi - Chapters: 21 - Words: 76,905 - Reviews: 235 - Favs: 417 - Follows: 550 - Updated: 12/9 - Published: 11/29/2022 - Master Chief/John-117, Cortana, Commander, Rapi
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: 373 - Follows: 507 - 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: 142 - Follows: 175 - Updated: 12/9 - Published: 8/24 - Master Chief/John-117, Arbiter, 343 Guilty Spark, C. Halsey
Infinity's Retribution by AverageLieutenant reviews
After suffering a Slipspace drive failure, the Crew of the UNSC Infinity alongside Battlegroup Dakota must find a way back to their own universe after being transported all the way to a similar Sol System but the Earth is declining and humanity is set on the brink of extinction.
Crossover - Starblazers & Halo - Rated: T - English - Chapters: 2 - Words: 2,563 - Reviews: 5 - Favs: 18 - Follows: 30 - Updated: 12/8 - Published: 12/6 - Alex W./M. Kodai, A. Avatar/J. Okita, J. Cutter, T. Lasky
Spartans Don't Play Games by You will not find me reviews
The Tourney of Harrenhall was the greatest of its kind in Westeros. It was a grand show of the power of house Whent that drew the attention of all seven kingdoms. However, the Westerlands have arrived with strange new allies. Great warriors who bear the sigil of an eagle with arrows and lightning in its claws. Who are these new allies, and what do they mean for Westeros?
Crossover - Halo & Game of Thrones - Rated: T - English - Fantasy/Sci-Fi - Chapters: 51 - Words: 209,522 - Reviews: 1727 - Favs: 1,695 - Follows: 2,048 - Updated: 12/8 - Published: 11/17/2020 - Kurt-051, Lucy-B091, Tom-B292, Tywin L.
Book 1: Wolves by Believer218 reviews
The Academy became the home of Spartan training after the loss of Laconia Station. Kept hidden for decades, it has the potential to tip the balance in favor of the UNSC. But secrets lurk beneath the facility, and they are about to be unleashed. Join the Lone Wolves as they embark on an adventure that could change more than one universe. Rated M for graphic depictions of violence.
Crossover - Halo & Avatar: Last Airbender - Rated: M - English - Fantasy/Adventure - Chapters: 15 - Words: 88,897 - Reviews: 7 - Favs: 10 - Follows: 14 - Updated: 12/8 - Published: 6/27 - H. Dinh, OC, Aang, Katara
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: 478 - Favs: 1,309 - Follows: 1,773 - 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: 110 - Follows: 171 - Updated: 12/7 - Published: 8/9/2022 - Master Chief/John-117, Ruby R., Atriox, Cortana
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