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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: 237 - Favs: 500 - Follows: 714 - Updated: 8h - 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: 156 - Favs: 340 - Follows: 518 - Updated: 9h - 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: 10h - 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: 18 - Favs: 102 - Follows: 150 - Updated: 14h - 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: 47 - Favs: 119 - Follows: 200 - Updated: 16h - 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: 119 - Favs: 451 - Follows: 669 - Updated: 18h - 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: 33,302 - Reviews: 31 - Favs: 141 - Follows: 204 - 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: 122 - Follows: 172 - 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: 208 - 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: 580 - Follows: 734 - 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: 10 - Follows: 19 - 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: 416 - Follows: 549 - 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: 374 - Follows: 506 - 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: 4 - 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: 1,693 - Follows: 2,044 - 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 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: 40 - Words: 135,756 - Reviews: 82 - Favs: 184 - Follows: 231 - Updated: 12/8 - Published: 7/15 - Space Marines, OC, Arbiter, Linda-058
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: 475 - Favs: 1,308 - Follows: 1,767 - 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: 170 - 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: 140 - 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: 30 - Favs: 19 - Follows: 35 - 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: 85 - Follows: 133 - 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: 98 - Favs: 258 - Follows: 321 - Updated: 12/5 - Published: 2/16/2022 - Samuel-034, Mirio T., T. Amajiki, Nejire Hado
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: 16 - Words: 58,690 - Reviews: 182 - Favs: 239 - Follows: 311 - Updated: 12/5 - Published: 6/13 - [J. Rico, Dizzy F.] C. Halsey, T. Lasky
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