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Fireteam Mystic by Vandal1037 reviews
Dr. Catherine Halsey recives horrific visions of a future where humanity is crushed and destroyed beneath an iron boot. Her spartans were not enough to weather the coming storm. However her visions lead her into somethig more, a long lost power and a chance to help humanity rise to the top of the food chain.
Crossover - Harry Potter & Halo - Rated: M - English - Sci-Fi/Adventure - Chapters: 4 - Words: 16,468 - Reviews: 18 - Favs: 48 - Follows: 69 - Updated: 52m - Published: 7/23 - Harry P., Ron W., Master Chief/John-117, C. Halsey
Gensokyo: Combat Evolved by CrackPairingLover reviews
A collection of short stories that are all loosely connected to one another. Please leave reviews and share your thoughts.
Crossover - Halo & Touhou Project - Rated: M - English - Sci-Fi/Fantasy - Chapters: 3 - Words: 1,047 - Reviews: 3 - Favs: 1 - Follows: 1 - Updated: 19h - Published: 7/26 - Rtas 'Vadumee, Youmu K., Rookie, Reimu H.
Boku No Halo Academia: For Want of a Mustard Seed by Iowaman24 reviews
Eleven years have passed since the apocalyptic collapse at the end of the Third World War, and under Aurdel Ganowicz's oversight much of Japan has been rebuilt. However many are still unhappy with the way things are, and as a result the League of Villains has returned. But without an ideology, and under a seemingly revived former member, they are hellbent on destroying everything.
Crossover - Halo & My Hero Academia/僕のヒーローアカデミア - Rated: M - English - Sci-Fi/Drama - Chapters: 2 - Words: 7,597 - Reviews: 1 - Favs: 4 - Follows: 4 - Published: 22h - OC, Izuku M., 1-A Students
Avatar: The Lost Wolves by Believer218 reviews
The Academy became the home of Spartan training after the loss of Laconia Station. Kept hidden on a secret world, it has the potential to tip the balance in favor of the UNSC. But secrets lurk beneath the facility, and those secrets are about to be unleashed. Join the Lone Wolves as they embark on an adventure that could change more than just their world.
Crossover - Halo & Avatar: Last Airbender - Rated: T - English - Fantasy/Adventure - Chapters: 7 - Words: 29,076 - Reviews: 3 - Favs: 3 - Follows: 6 - Updated: 7/29 - Published: 6/27 - H. Dinh, OC, Aang, Katara
Halo ALT: Remnant by scouttroop
In an Alternate Universe, the UNSC has colonized a disserted Remnant while at war against the United Rebel Front. Meanwhile Pyrrha Nikos who lost her fight against Cinder Fall lands in this Alternate Universes and stranded. Pyrrha herself would join the UNSC since there is probably no way back to her dimension. Alternate Universe Setting
Crossover - Halo & RWBY - Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 907 - Favs: 11 - Follows: 13 - Published: 7/29 - Catherine-B320/Kat/Noble Two, Carter-A259/Noble One, SPARTAN-B312/Noble Six, Pyrrha N.
Dimensional Circumstance by tyler6750 reviews
After their escape from the Ark and a 7 month Nap, Chief and Cortana find themselves in the Sol System, but not the one they know, Earth is all but Destroyed by a Tyrannical Race known as the Gamilans, they must help the crew of the Space Battleship Yamato make her Maiden Voyage to Iscandar and back within a year to save Humanity from Extinction
Crossover - Starblazers & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 7 - Words: 24,916 - Reviews: 63 - Favs: 121 - Follows: 158 - Updated: 7/29 - Published: 6/1/2020 - A. Avatar/J. Okita, D. Wildstar/S. Kodai, Master Chief/John-117, Cortana
Wrong Place, Right Time: A Hero's Story by DLTA-BOT reviews
The journey of a hero doesn't always start where they expect. It doesn't always happen to those who expect it. Damon was never interested in being what SPARTANs represent: an implacable force for good standing as humanity's shield. Like most other third-generation SPARTANs, the war took everything from him. All he wanted was to return the favor. Sometimes we don't get a choice.
Crossover - Fallout & Halo - Rated: T - English - Adventure/Sci-Fi - Chapters: 74 - Words: 874,570 - Reviews: 210 - Favs: 419 - Follows: 457 - Updated: 7/28 - Published: 9/29/2020 - Sole Survivor, Arthur Maxson, Shaun, OC
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. Read next chapter Author Notes for important news.
Crossover - Warhammer & Halo - Rated: T - English - Adventure/Romance - Chapters: 4 - Words: 11,667 - Reviews: 18 - Favs: 49 - Follows: 62 - Updated: 7/28 - Published: 7/15 - Space Marines, OC, Arbiter, Linda-058
Spectre with a Spartan Sister by ZeBear reviews
In 2574, after the formation of the United Sentient Species Federation, they find more intelegent life. Having infiltrated the Normandy Project, they save John Shepard from dying after the Collectors attack at the end of Mass Effect 1. Neglecting to tell his friends. Now with and entire Federation of Species behind him, instead of Cerberus, how will John deal with it all?
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 2 - Words: 1,463 - Reviews: 4 - Favs: 14 - Follows: 23 - Published: 7/28 - [Shepard, Tali'Zorah] Garrus V.
Reunion in Fire by Illuviar reviews
For thirty years, humanity led by the UNSC has fought a war against the Covenant. The Covenant glassed hundreds of colonies and killed billions. Humanity is losing the war. At the same time, a galaxy away, the Federated Empire rises from the ashes of the Clone Wars and the Black Rebellion, slowly rebuilding. It is at this time, that the last of the Precursors decided to intervene.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 26 - Words: 96,999 - Reviews: 72 - Favs: 276 - Follows: 306 - Updated: 7/26 - Published: 3/11 - Anakin Skywalker, Obi-Wan K., Master Chief/John-117, SPARTAN-B312/Noble Six
The Last Metroid by ShadowLight223 reviews
Her Metroid dna has 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: 23 - Words: 106,730 - Reviews: 221 - Favs: 297 - Follows: 435 - Updated: 7/25 - Published: 9/20/2022 - Samus A., Master Chief/John-117
From Reach to Eclipse: The Black Swordsman and the Spartan by Dan Is Here reviews
Noble Six makes a final stand on Reach, only to be transported to the world of Berserk. Stranded in an alien land, he encounters the stoic warrior Guts. Despite their initial tension, they unite to face a common threat - the relentless onslaught of demons, fostering a tentative understanding.
Crossover - Berserk & Halo - Rated: T - English - Chapters: 1 - Words: 4,889 - Reviews: 1 - Favs: 15 - Follows: 20 - Published: 7/25 - Guts, SPARTAN-B312/Noble Six
Xcom: Fire From Above by StalinWithDaSpoon reviews
XCOM was losing. It lost the first contact war, and now it was losing the resistance war. Even with the Commander to lead them, they had made little progress in destabilizing the aliens regime. But this would change with a new factor being added to the battle, as what can only be described as Fire From Above.
Crossover - X-Com & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 3 - Words: 7,963 - Reviews: 5 - Favs: 31 - Follows: 49 - Updated: 7/24 - Published: 7/19 - Bradford, J. Cutter, E. Anders, Jerome-092
Halo Galactic Wars: RE-IMAGINED by Crimson Soldat reviews
During the Battles of Zeta Halo, the Master Chief happens across a new site drastically different from the installation it resides on. Without any warning, he is violently sucked into a new war in a Galaxy Far, Far, Away. The following event will shake both universes and their respective peoples. And new secrets, thought lost to time, will be uncovered. co-written by F35B.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 2 - Words: 13,913 - Reviews: 13 - Favs: 75 - Follows: 101 - Updated: 7/24 - Published: 7/14 - Anakin Skywalker, Obi-Wan K., Ahsoka T., Master Chief/John-117
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: 1 - Words: 1,227 - Reviews: 4 - Favs: 15 - Follows: 27 - Published: 7/24 - SPARTAN-B312/Noble Six, Space Marines
The Exiles:A New Power by Johnnieboy11 reviews
The beginning of the Battle For Earth signaled the start of the final, bloodiest campaign of the Human-Covenant War. Hastily, a plan is put into motion and an Ark Fleet, composed of a dozen Phoenix-class vessels and their escorts, makes the jump out of system. Either interference, or malfunction, causes their arrival to a new Galaxy, where new threats lurk just around the corner.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 8 - Words: 28,835 - Reviews: 160 - Favs: 632 - Follows: 969 - Updated: 7/24 - Published: 12/26/2021 - OC, Tali'Zorah, Admiral Hackett, Rael'Zorah
Noble Intent by In BRRRRRRT We Trust reviews
Without warning, her world went dark, but that's not where her story ends. When Catherine - B320 wakes up in a small room surrounded by others wielding legendary weapons, she quickly realizes what she's in for and now has to adapt to a different kind of hell. Will she fall just as she did on Reach? Or will she bring about a change solidifying her status as a demon?
Crossover - Halo & Rising of the Shield Hero/盾の勇者の成り上がり - Rated: M - English - Adventure/Fantasy - Chapters: 6 - Words: 39,541 - Reviews: 50 - Favs: 181 - Follows: 209 - Updated: 7/24 - Published: 6/27 - Catherine-B320/Kat/Noble Two, Raphtalia
Azuveya: Fury Oh Fury by Kira Kyuu reviews
Aloe Potter (fem!HP) wasn't sure how she got here - 'here' being in what seemed to be a young girl's body, four-hundred-and-some-odd years into the future, and at risk of being killed by an alien empire, but it seemed like something her luck would come up with.
Crossover - Harry Potter & Halo - Rated: T - English - Chapters: 21 - Words: 32,526 - Reviews: 260 - Favs: 896 - Follows: 1,158 - Updated: 7/23 - Published: 8/24/2014 - Harry P.
Harry Potter got trained by Driver1985 reviews
On the night Harry would have been dropped off by his Aunt, Dumbledore had someone else in mind. What if Harry was taken in by other strong people and they even decided to train him? Trained to be a Warrior by Wolves and the UNSC, he will change the world. OP, smart, trained Harry, small harem double cross with Witcher and Halo
Crossover - Harry Potter & Halo - Rated: M - English - Fantasy/Sci-Fi - Chapters: 82 - Words: 405,150 - Reviews: 317 - Favs: 691 - Follows: 819 - Updated: 7/23 - Published: 9/30/2021 - [Harry P., Hermione G., Daphne G.] Master Chief/John-117
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: 18 - Words: 141,081 - Reviews: 185 - Favs: 401 - Follows: 479 - Updated: 7/23 - Published: 4/17/2022 - Clark K./Kal-El/Superman, Master Chief/John-117
The Persean War by Johnnieboy11 reviews
In a split-second, reality becomes completely different than what one was used to. Though, the more some things change, the more they stay the same. War remained a constant in the Persean Sector, even as a fragile peace and a tenuous alliance formed, the Remnant, Ancient AIs of the Old War, struck at one of the nations, causing a shift that will ripple throughout a new world.
Crossover - Halo & Starsector - Rated: T - English - Sci-Fi/Supernatural - Chapters: 2 - Words: 9,400 - Reviews: 10 - Favs: 42 - Follows: 68 - Updated: 7/23 - Published: 6/26 - Master Chief/John-117, A. J. Johnson, C. Halsey, Cortana
Halo: Spiraling Conflict by Legend of Flashfox reviews
Toking from a young age, he was made to be the Ultimate Spartan before he was released to do what he wants. With a new lease on life, Naruto has no idea what to do with his life except for what he was trained to do. Will he embrace this new freedom or is this all a trap? In Haloverse with Naruto char. New species and factions. Chakra with tech blend. Narutox?
Crossover - Halo & Naruto - Rated: M - English - Chapters: 2 - Words: 4,393 - Reviews: 8 - Favs: 34 - Follows: 40 - Updated: 7/22 - Published: 7/20 - C. Halsey, Naruto U., Kyuubi/Kurama, Danzō S.
Halo: Universal Vortex by Legend of Flashfox reviews
With the rush of the firing of the rings errors occurred. More species come into play and humanity no longer started on Earth alone. The planet Elemental is here with humans who are different from Earth. Now Naruto needs to navigate this war torn galaxy. Alive preferably. Pairings maybe Harem. NarutoXHalo world merged with bits of others like Star Wars and Mass Effect. Maybe more.
Crossover - Halo & Naruto - Rated: M - English - Chapters: 64 - Words: 142,227 - Reviews: 271 - Favs: 350 - Follows: 415 - Updated: 7/22 - Published: 1/10/2022 - C. Halsey, Naruto U.
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: 16 - Words: 63,220 - Reviews: 118 - Favs: 471 - Follows: 588 - Updated: 7/22 - Published: 3/23 - Anakin Skywalker, Ahsoka T., Master Chief/John-117, T. Lasky
The ONI Offensive by MrChef99 reviews
A small killteam of Spartan 3's are approached by the assassin's brotherhood during an OP against insurrectionists and are told the truth about ONI, and their plot to continue the Human-Covenant war so that they can be led to more forerunner artifacts to unlock the true potential of the apple of Eden.
Crossover - Halo & Assassin's Creed - Rated: T - English - Sci-Fi/Mystery - Chapters: 1 - Words: 570 - Reviews: 1 - Published: 7/22
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