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Horizon War:Tales of the UNSC-Citizen Federation War by Johnnieboy11 reviews
A chance encounter with Forerunner Technology leads the UNSC to discover a two-way portal which leads into a Universe so similar, yet ever so different from their own. First contact with said Universe's humanity, however, goes awfully wrong, sparking the greatest war since the Human-Covenant War. These are the tales of those who fought in it.
Crossover - Halo & Starship Troopers - Rated: M - English - Adventure/Sci-Fi - Chapters: 17 - Words: 62,690 - Reviews: 182 - Favs: 240 - Follows: 310 - Updated: 18m - Published: 6/13 - [J. Rico, Dizzy F.] C. Halsey, T. Lasky
The Great War by Forgotten Trooper reviews
9BBY The Galactic Empire is a Behemoth, with no Rebellion to speak of and a unstoppable military, it will soon find itself dragged into conflict with unforeseen enemies and unusual allies. The UNSC is losing the war to the Covenant, and the Prophets consolidate their power over their Dominion. These Gargantuan forces will collide in a war that will leave the galaxy forever changed.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi - Chapters: 4 - Words: 15,191 - Reviews: 22 - Favs: 65 - Follows: 100 - Updated: 12h - Published: 8/13 - Darth Vader, Prophet of Truth, P. Cole
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: 42 - Words: 145,049 - Reviews: 82 - Favs: 191 - Follows: 238 - Updated: 15h - Published: 7/15 - Space Marines, OC, Arbiter, Linda-058
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: 52 - Words: 214,397 - Reviews: 1743 - Favs: 1,702 - Follows: 2,056 - Updated: 22h - Published: 11/17/2020 - Kurt-051, Lucy-B091, Tom-B292, Tywin L.
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: 20 - Words: 98,707 - Reviews: 50 - Favs: 140 - Follows: 175 - Updated: 12/16 - Published: 2/7 - [Elster/LSTR-512, Ariane Yong] Master Chief/John-117, Cortana
Everything is Fair in Love and War by VastErimos reviews
So you died? Nailed it. Here try again for my entertainment. OPMC, Waifu Catalog fic, if you have a problem with either of these that’s fine. Currently in Stargate.
Crossover - Halo & X-overs - Rated: M - English - Sci-Fi/Friendship - Chapters: 13 - Words: 50,189 - Reviews: 46 - Favs: 100 - Follows: 124 - Updated: 12/15 - Published: 8/9/2022 - Fred-104, Serina
Spartan and Astartes by Dragon Scripture reviews
War never changes be it in the 26th century or the 40th millennium
Crossover - Halo & Warhammer - Rated: T - English - Romance/Adventure - Chapters: 4 - Words: 6,294 - Reviews: 26 - Favs: 55 - Follows: 65 - Updated: 12/15 - Published: 7/24 - SPARTAN-B312/Noble Six, Space Marines
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: 14 - Words: 60,022 - Reviews: 284 - Favs: 595 - Follows: 847 - Updated: 12/15 - Published: 11/23 - Cortana, Shepard
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: 3 - Words: 4,380 - Reviews: 8 - Favs: 21 - Follows: 40 - Updated: 12/15 - Published: 12/6 - Alex W./M. Kodai, A. Avatar/J. Okita, J. Cutter, T. Lasky
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: 21 - Favs: 107 - Follows: 137 - Updated: 12/15 - Published: 12/3 - OC
Midnight Falls by Ilveaztea2 reviews
Spartan B311 was fighting alongside B312, Noble Six, as they made their last stand on Reach. Then with no explanation, B311 wakes up in the ruins of what was once a city on earth and that the year is 2287 instead of the year 2552.
Crossover - Halo & Fallout - Rated: M - English - Sci-Fi - Chapters: 2 - Words: 4,335 - Reviews: 4 - Favs: 9 - Follows: 16 - Updated: 12/15 - Published: 12/3 - OC, Sole Survivor
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: 868 - Follows: 995 - 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: 55 - Favs: 220 - Follows: 271 - 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: 22 - Favs: 31 - Follows: 48 - 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: 143 - Follows: 179 - Updated: 12/14 - Published: 5/1/2021 - [OC, Pyrrha N.] SPARTAN-B312/Noble Six, J. Ironwood
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: 350 - Follows: 530 - 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: 135 - Follows: 199 - 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: 131 - Follows: 214 - 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: 124 - Favs: 457 - Follows: 676 - 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: 38 - Favs: 156 - Follows: 234 - 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: 135 - Follows: 185 - 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: 459 - Follows: 539 - 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: 588 - Follows: 745 - 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.
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