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All the Stars by BlueWay reviews
When the Long Night of Solace is evaporated over Reach via the weaponized usage of a Slipspace Drive, it ferries with it in its swallowed sections the Covenant Empire and, more horrifyingly, the desperate measures that the UNSC used to fight them. When they are found in a universe on the precipice of their own history, the meaning of the term "Mass Effect" will change forever.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 42 - Words: 729,387 - Reviews: 1181 - Favs: 1,619 - Follows: 1,982 - Updated: 16h - Published: 6/8/2018 - SPARTAN-B312/Noble Six, Rookie
Another RvBReach Crossover by ilovesmokingweed
I love bongs, joints, blunts, eddies, shakes, carts, stizzys, tinctures, c-pills, topicals, dabs, pipes, chillums, bongs
Crossover - Halo & Red vs. Blue - Rated: T - English - Humor/Sci-Fi - Chapters: 1 - Words: 2,529 - Follows: 1 - Published: 17h - SPARTAN-B312/Noble Six, Carolina, Wash, M. Hargrove/Chairman
The Spartan's Wrath by SpartanPrime101 reviews
I have been called many things since I first arrived in this universe. The locals call me a hero. That boy scout, Superman, calls me a mindless killer. The Amazon…a necessary evil. Gotham's Batman…a murderer. I'm all that, and much more…I'm a Spartan. OC Spartan. Rated M for Mature Themes. Please Read and Review.
Crossover - Halo & Justice League - Rated: M - English - Sci-Fi - Chapters: 12 - Words: 29,216 - Reviews: 104 - Favs: 223 - Follows: 300 - Updated: 22h - Published: 10/31 - OC, Diana of Themyscira/Wonder Woman, Barbara Gordon/Batgirl/Oracle
Halo Galactic Wars: Anthologies by Crimson Soldat reviews
Master Chief and a few others had managed to mark their mark in the Galaxy. Yet there are those that hasn't gained enough attention. Untold stories to those who had placed their mark upon where they were. Both in the Far, Far Galaxy and the Master Chief's Home Galaxy. WARNING: CONTAINS A LOT OF ORIGINAL CHARACTERS!
Crossover - Star Wars & Halo - Rated: T - English - Adventure - Chapters: 5 - Words: 3,909 - Reviews: 1 - Favs: 7 - Follows: 10 - Updated: 22h - Published: 9/12
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: 62 - Words: 287,453 - Reviews: 147 - Favs: 475 - Follows: 566 - Updated: 12/6 - Published: 9/30/2021 - [Harry P., Hermione G., Daphne G.] Master Chief/John-117
Harry-147 by TheEternalForce reviews
Harry is transported to Reach by a forerunner artefact after being chased by Dudley and his friends. Halsey finds that he's a genetic match and he is inducted into the SPARTAN-II program.
Crossover - Harry Potter & Halo - Rated: T - English - Sci-Fi - Chapters: 6 - Words: 10,205 - Reviews: 67 - Favs: 189 - Follows: 276 - Updated: 12/6 - Published: 4/26 - Harry P., C. Halsey
Evidence of Glory by Cat-Plant
In a world filled with peril, and uncertainty, either defeat or victory remains. Join Josi Vadam and his compatriots in a world rife with action and adventure as he discovers the truth of his world and his life in the Covenant and beyond! (what if the covenant and other beings in Halo had stands)(Part 7 Universe)(OC)(Alternative Arbiter)
Crossover - Halo & JoJo's Bizarre Adventure - Rated: M - English - Sci-Fi/Supernatural - Chapters: 9 - Words: 14,812 - Favs: 1 - Follows: 2 - Updated: 12/5 - Published: 10/4 - Arbiter, Rtas 'Vadumee
Digimon War Game S2 by riven-del
The Halo has been destroyed, but the Covenant have a new objective: Earth. Cassandra will have her work cut out for her as she helps the Pillar of Autumn's crew stall the enemy and more Tamers with crests show up.
Crossover - Digimon & Halo - Rated: T - English - Adventure/Sci-Fi - Chapters: 5 - Words: 3,762 - Favs: 3 - Follows: 3 - Updated: 12/5 - Published: 9/2 - OC, Herissmon, Master Chief/John-117, Fred-104
HALO: Dead Man of the Moon by UH-60 NIGHTSTALKER reviews
When a new yet familiar Enemy threatens Neo-Queen Serenity and her court/friends, an unlikely ally appears and just happens to have a UNSC Warship at his command. But can Serenity's Senshi trust this new armored clad stranger?
Crossover - Halo & Sailor Moon - Rated: T - English - Adventure/Sci-Fi - Chapters: 15 - Words: 45,418 - Reviews: 80 - Favs: 107 - Follows: 127 - Updated: 12/5 - Published: 1/30/2021 - Neo-Queen Serenity, OC
No Greater Calling by silencewillfall0091 reviews
Because here's the thing. Turians, despite their reputations, had never loved war- not the suffering, the dying, nor the pain. They loved victory- the prevailing of clear good over clear evil- justice winning in the end, the beating of overwhelming odds for peace. And there was never more a clear example of this type of war than ours against the Covenant.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 4 - Words: 6,957 - Reviews: 86 - Favs: 341 - Follows: 556 - Updated: 12/4 - Published: 1/7
No Gods, Nor Masters by Johnnieboy11 reviews
After the pyrrhic victory of the Human-Covenant War, the Covenant was split into many warring factions vying for the power of old. The UNSC was left, bloodied, but as the sole power in the Milky Way for now. After an incredible discovery within a set of Forerunner Ruins, an Exploration Fleet with Doctor Halsey at its head is sent out. What they find will change everything.
Crossover - Halo & Gate - Jietai Kare no Chi nite, Kaku Tatakeri - Rated: T - English - Adventure/Sci-Fi - Chapters: 31 - Words: 146,696 - Reviews: 636 - Favs: 915 - Follows: 1,154 - Updated: 12/4 - Published: 1/28 - C. Halsey, OC, Itami, Tyuule
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: 2 - Words: 9,160 - Reviews: 17 - Favs: 83 - Follows: 99 - Updated: 12/4 - Published: 11/29 - Master Chief/John-117, Cortana, Commander, Rapi
Operation Unusual Paperwork by kpmh2001 reviews
A side story containing all of the story exerpts, post chapter nonsense, and omakes that the world of The Men From Onyx has to offer, now in one convenient package! Warning: The tone and intention of these short stories will change on a by-chapter basis, tonal consistency is effectively not a consideration.
Crossover - Halo & RWBY - Rated: T - English - Parody/Humor - Chapters: 32 - Words: 113,188 - Reviews: 169 - Favs: 95 - Follows: 101 - Updated: 11/30 - Published: 10/4/2019
Lost so much, but gained so much more by Eyeya Fett reviews
Ethan AKA Noble Six lost his family to war, Kara lost hers to an explosion. They've lost so many loved ones in their time and left heartbroken. Can they help one another heal? UPDATED STORY COVER!
Crossover - Supergirl & Halo - Rated: T - English - Drama/Romance - Chapters: 13 - Words: 22,643 - Reviews: 11 - Favs: 31 - Follows: 32 - Updated: 11/30 - Published: 10/20/2020 - [Astra, Alex D.] SPARTAN-B312/Noble Six, Kara D./Supergirl
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: 9 - Words: 74,010 - Reviews: 118 - Favs: 251 - Follows: 323 - Updated: 11/30 - Published: 4/17 - Clark K./Kal-El/Superman, Master Chief/John-117
Shadow is the Light by CopperstarTomoe reviews
After the events of Deepground. Vincent Valentine and her charge Shelke were captured and detained by an mysterious group. 500 years past and when Vincent is awaken she realize how much has change. Now she has to help the Master Chief fight off the Covenant, Flood, and Deepground while facing all the secrets that's been kept from her. [Female Vincent Valentine]
Crossover - Final Fantasy VII & Halo - Rated: M - English - Friendship/Suspense - Chapters: 3 - Words: 1,125 - Reviews: 1 - Favs: 1 - Follows: 1 - Updated: 11/29 - Published: 11/11 - Vincent V., Master Chief/John-117, Cortana, Shelke R.
Flames of War by Lighting wolf knight reviews
Space Marines and Spartans weren't so different... Especially for war. Rated T for violence, death, and profanity. Doesn't entirely follow games. Does NOT follow Warhammer logic or lore no Imperium conquest.
Crossover - Warhammer & Halo - Rated: T - English - Romance/Adventure - Chapters: 4 - Words: 8,043 - Reviews: 5 - Favs: 18 - Follows: 28 - Updated: 11/29 - Published: 1/28 - [OC, Linda-058] Space Marines, Kelly-087
Obsidian by Viper-Vivv reviews
After the events of Halo 2, the UNSC is confronted with new enemies and allies as both sides struggle to control the Ark and its Rings. Combines Halo, Star Wars, Evangelion, and other series into one universe.
Crossover - Halo & Star Wars - Rated: M - English - Adventure/Sci-Fi - Chapters: 3 - Words: 1,404 - Reviews: 3 - Favs: 4 - Follows: 6 - Updated: 11/29 - Published: 11/26 - Master Chief/John-117, A. J. Johnson, Darth Vader, Luke S.
Halo: Down Fall Of The Gods by Reaper Eye Fuck ONI reviews
It is said that when an Era ends it usually ends with either Man almost dying or a lot of civilizations crumbling this is that story...if it was told by a Emo kid but no this story is told through "Fuck you and fuck your empire" "Run Xenos run for man marches"-Unknow soldier as he was shooting a Jaffa in the face with a shotgun.
Crossover - Stargate: SG-1 & Halo - Rated: M - English - Sci-Fi/Humor - Chapters: 11 - Words: 21,105 - Reviews: 45 - Favs: 84 - Follows: 113 - Updated: 11/29 - Published: 12/19/2021 - Ra, Thor, Master Chief/John-117, A. J. Johnson
Creative Descriptions for a Crossover Concept (Animorphs & Halo) by StellarStylus reviews
Here are some creative descriptions for a very unique crossover concept, combining Animorphs & Halo. Come for the art, stay for the writing. Maybe this will be expanded upon in the future?
Crossover - Animorphs & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 2 - Words: 1,233 - Reviews: 1 - Updated: 11/29 - Published: 5/31
Mass Effect: Forward Unto Dawn by Wiggybaby67 reviews
Spartans never die. They're just missing in action. At least, that's how the saying goes. But for the Master Chief and Cortana, they're no longer missing. Awaking in a different universe, the two of them will uphold their oath: to protect Earth and all her colonies. Only it won't be from the Covenant this time. And just who is this Commander Shepard they'll be working with?
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 3 - Words: 3,522 - Reviews: 15 - Favs: 57 - Follows: 103 - Updated: 11/28 - Published: 11/26 - Master Chief/John-117, Shepard
The Noble Wolf of Earth by Slim A Lou Prime reviews
Noble Six was fighting the inevitable, he knew he would die on Reach. Yet he was not going to make it easy for covenant. Turns out killing him was outside their ground forces abilities. So they sent a cruiser glass him. That ship only managed to trap him before a flying forerunner monitor decided to set him lose on another galaxy. Maybe he wasn't meant to die on Reach.
Crossover - Stargate: SG-1 & Halo - Rated: M - English - Sci-Fi/Adventure - Chapters: 1 - Words: 8,694 - Reviews: 14 - Favs: 66 - Follows: 102 - Published: 11/28 - SPARTAN-B312/Noble Six
Halo Galactic Wars by Crimson Soldat reviews
While on a search mission within Zeta Halo, Master Chief and his new AI Companion stumbles upon an unknown site that isn't Forerunner in origins. Next thing they knew, both ends up in another Galaxy and are forced to partake in a war that they had found themselves in. With them and a few surprises, the known universe will never be the same ever again. Co-written by SomeRandomMarine
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 8 - Words: 47,176 - Reviews: 72 - Favs: 258 - Follows: 326 - Updated: 11/28 - Published: 6/30 - Anakin Skywalker, Obi-Wan K., Ahsoka T., Master Chief/John-117
I Don't Know Them! by Bill Fusuki
One-shot/Flash-Fiction. Master Chief and the Straw Hat Pirates square up against Buggy and his Clown Pirates.
Crossover - Halo & One Piece - Rated: T - English - Adventure - Chapters: 1 - Words: 707 - Favs: 1 - Published: 11/28 - Master Chief/John-117, Luffy, Zoro, Nami - Complete
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/Adventure - Chapters: 6 - Words: 27,733 - Reviews: 45 - Favs: 110 - Follows: 192 - Updated: 11/27 - Published: 9/20 - Samus A., Master Chief/John-117
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