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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: 4 - Words: 14,090 - Reviews: 53 - Favs: 107 - Follows: 141 - Updated: 6/22 - Published: 6/13 - [J. Rico, Dizzy F.] C. Halsey, T. Lasky
The Spartan Of Smallville by SSJ Lone Wolf reviews
Between the Insurrectionists and the Covenant, he thought he had done and seen it all. But after being transported to an alternate universe and settling down in Smallville, Spartan-B312 realizes that his toughest challenge is about to begin...High School. He'll soon learn that there is more to this quiet little town than he initially thought.
Crossover - Smallville & Halo - Rated: M - English - Chapters: 5 - Words: 36,363 - Reviews: 143 - Favs: 284 - Follows: 322 - Updated: 6/20 - Published: 8/18/2022 - Clark K./Superman, Lex L., SPARTAN-B312/Noble Six
On the Shoulders of Giants by Shoot The Runner reviews
Two galaxies thrown together by a cosmic fluke. On one side of the galaxy, the war-weary UNSC vows to rebuild and become a giant in the stars so that they will never be so helpless again. Whilst another humanity is still finding its feet in the Citadel, with treachery and politics hindering its progress. How does the merging of two galaxies impact the course of all of their fates?
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 9,844 - Reviews: 25 - Favs: 114 - Follows: 136 - Published: 6/20 - Master Chief/John-117, T. Hood, Shepard, D. Udina
Halo: The Search For Ezra Bridger by GigaSlayer reviews
Three years after the Liberation of Lothal, Ahsoka and Sabine continue their search for Ezra Bridger, they have recently heard rumours of a massive shipwreck free for salvage deep in the Unknown Regions, thinking it may be related to Ezra in some way they cross the boundary of the Unknown Regions. Beginning the adventure of a lifetime.
Crossover - Halo & Star Wars Rebels - Rated: T - English - Sci-Fi/Horror - Chapters: 5 - Words: 5,293 - Reviews: 7 - Favs: 34 - Follows: 43 - Updated: 6/20 - Published: 5/20 - Master Chief/John-117, Ahsoka T./Fulcrum, Sabine W.
The Promise by Mr. Blackberry reviews
During his time as a student, Naruto found something. Something that would help him greatly in the future. Fast forward he has lost his home world to the covenant. He along with the few friends that he was able to save will not stop until the covenant is brought to its' knees. That is their promise.
Crossover - Halo & Naruto - Rated: M - English - Adventure/Sci-Fi - Chapters: 4 - Words: 13,742 - Reviews: 31 - Favs: 172 - Follows: 200 - Updated: 6/19 - Published: 8/31/2020 - Naruto U., Sakura H., Hinata H.
Different Realities by Blue-Jay1009 reviews
As the Autobots and Decepticon stumble across a strange device that is of unknown origin. As one of their human friends accidentally activates the device it transports the two wagering factions and humans into a different universe where they landed on a dead planet that belongs to an advanced humanity a few years prior to the war with the covenant been over.
Crossover - Transformers/Beast Wars & Halo - Rated: T - English - Drama/Adventure - Chapters: 7 - Words: 15,144 - Reviews: 34 - Favs: 118 - Follows: 136 - Updated: 6/19 - Published: 1/4/2022 - Bumblebee, Optimus Prime, Master Chief/John-117, Cortana
The Wizard from Tribute (CANCELLED) by PhillyCh3zSt3ak reviews
The year is 2552 and humanity has just escaped genocide from the Covenant thanks to the Great Schism. Harry's family is killed by Brutes and is sent to an orphanage after being rescued by an unlikely ally. He is later adopted by a certain ODST. What will happen when the worlds of magic and advanced technology meet? Rated T for safety. -Cancelled as of 6/19/23.-
Crossover - Harry Potter & Halo - Rated: T - English - Sci-Fi - Chapters: 4 - Words: 9,200 - Reviews: 36 - Favs: 122 - Follows: 153 - Updated: 6/19 - Published: 11/25/2015 - Harry P., Rookie - Complete
Forward Unto Johto by Full-Paragon reviews
Not long after the Great War, ONI has discovered a lost colony filled with strange life forms, and potentially full of powerful artifacts from the same race that built the Halo array. Seeking further information, and potentially powerful new weapons, ONI has dispatched an elite team to investigate the lost colony. As a part of that team, Titus Rann finds himself on a new world, wit
Crossover - Pokémon & Halo - Rated: T - English - Mystery - Chapters: 2 - Words: 10,789 - Reviews: 4 - Favs: 15 - Follows: 24 - Updated: 6/18 - Published: 6/9 - Magikarp
Darksiders Apocalyptic Warfare Chronicle One Combat Evolved by darksidersfollower97
The legendary Four Horsemen of the Apocalypse are in this alternative unvierse were order not to directly intervene for humanity during the human-Covenant war but during the Battle of Halo after the fall of reach things become complicated or chose another story in the first page.
Crossover - Darksiders & Halo - Rated: T - English - Sci-Fi/Supernatural - Chapters: 1 - Words: 1,279 - Favs: 2 - Follows: 3 - Published: 6/18
Serenity by Space-Dweeb reviews
2542. Humanity lost the war against the Covenant, and has been assimilated into the galaxy-spanning conglomerate. John-117 and his crew, formerly humanity's greatest champions, were forced into a life of crime in order to survive. Aboard the Firefly-class ship Serenity, they travel the galaxy with one mission: get a ship, get a crew, keep flying.
Crossover - Halo & Firefly - Rated: T - English - Sci-Fi/Western - Chapters: 10 - Words: 43,072 - Reviews: 8 - Favs: 21 - Follows: 30 - Updated: 6/17 - Published: 8/14/2022 - [Master Chief/John-117, Cortana] [Fred-104, Kelly-087]
Forward Unto Dawn by Frozone8010
In the 2468 57 years before the fateful day on harvest, a discovery was made. A discovery that will shake the very foundations of what humanity believed was truth and myth. What or Who was this discovery?
Crossover - Dragon Ball Z & Halo - Rated: K+ - English - Sci-Fi/Mystery - Chapters: 1 - Words: 1,456 - Favs: 4 - Follows: 7 - Published: 6/17 - Goku, Shenron, 343 Guilty Spark, C. Halsey
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: 45 - Words: 777,857 - Reviews: 1282 - Favs: 1,780 - Follows: 2,133 - Updated: 6/16 - Published: 6/8/2018 - SPARTAN-B312/Noble Six, Rookie
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: 72 - Words: 849,011 - Reviews: 201 - Favs: 413 - Follows: 450 - Updated: 6/16 - Published: 9/29/2020 - Sole Survivor, Arthur Maxson, Shaun, OC
Machine Hearts (A Dust and Echoes Megaman BN cross) by BaronCorrupt
RWBY/Halo/Megaman.exe recursive fic of Dust and Echoes by Trest
Crossover - Mega Man & Halo - Rated: M - English - Sci-Fi/Friendship - Chapters: 3 - Words: 11,747 - Favs: 2 - Follows: 1 - Updated: 6/16 - Published: 6/14 - Master Chief/John-117, Cortana
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: 21 - Words: 97,286 - Reviews: 199 - Favs: 276 - Follows: 407 - Updated: 6/15 - Published: 9/20/2022 - Samus A., Master Chief/John-117
The Terran Calamity by F35B reviews
The Republic finds a small planet on the edge of their space but little do they know the repercussions of their actions. The Terran Eagle will not accept any compromises, nor will any of her citizens. (Halo Inspired Universe) (Star Wars Canon Universe)
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi - Chapters: 7 - Words: 56,897 - Reviews: 109 - Favs: 280 - Follows: 340 - Updated: 6/14 - Published: 1/3 - OC
Roses Born of Dust by TallYapflip reviews
An ONI Prowler is sent to a small system on the Southern fringes of UNSC space, just along the border with the Sangheili, to investigate strange signals coming from a planet within. He encounters strange situations, strange people, and the strangest world in the galaxy. [White Rose & Bumblebee. Rated "M" For later.] (All Re-writes complete)
Crossover - Halo & RWBY - Rated: M - English - Sci-Fi/Romance - Chapters: 45 - Words: 245,266 - Reviews: 499 - Favs: 878 - Follows: 935 - Updated: 6/14 - Published: 10/26/2015 - [Weiss S., Ruby R.] [OC, Winter S.]
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: 10 - Words: 39,270 - Reviews: 34 - Favs: 71 - Follows: 96 - Updated: 6/13 - Published: 8/9/2022 - Fred-104, Serina
Sekirei: The Lost Wolf by Helghast honored guard reviews
The Lonewolf survived and made it off Reach .Now he finds himself trapped in another world, another time and another conflict. Up against a madman forcing a race of super powered aliens to fight to the death to bring a new age of the gods . (Six and Harem)
Crossover - Halo & Sekirei - Rated: M - English - Sci-Fi/Romance - Chapters: 15 - Words: 100,310 - Reviews: 103 - Favs: 314 - Follows: 409 - Updated: 6/13 - Published: 3/2/2022 - SPARTAN-B312/Noble Six, No. 12/Hibiki, No. 11/Hikari, No. 16/Toyotama
Whatever The Cost by Pending Review reviews
This will be a slightly AU story where a Spartan II: Jai-006, gets handed to ONI to be used as their personal asset immediately following his augmentations at 12. After years of running ops he encounters a Forerunner device that sends him into another universe and into the crosshairs of Jane Shepard. This will be a hurt/comfort fanfic filled with action.
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Hurt/Comfort - Chapters: 1 - Words: 3,376 - Reviews: 2 - Favs: 20 - Follows: 23 - Published: 6/13 - OC, Garrus V., Tali'Zorah, Shepard
Code Lyoko: War logs 1 by superman42 reviews
Stories (in chapter order) Prologue (Prelude to Crisis core) Dark Harvest storyline (start of crisis core) Heart of Ice (needed to understand prologue future crisis) Breakdown (Scrapped concept involving dino hybrids) in order: Prologue the remaining five chapters after that start Dark Harvest HOI precedes Dark Harvest (CC pt 1) which leads to Breakdown WL2 finishes CC
Crossover - Code Lyoko & Halo - Rated: M - English - Tragedy/Drama - Chapters: 13 - Words: 14,965 - Reviews: 8 - Favs: 3 - Follows: 2 - Updated: 6/12 - Published: 3/1/2022 - Aelita S., Jeremie B., Yumi I., OC - Complete
The Mantle of Remnant by KtyouVsWriting reviews
The Master Chief has saved Humanity at the cost of Cortana, one of his few remaining friends. More than he will admit, John relied on her, cared for her. To no longer have her means to lose another part of his humanity. Still the universe keeps going and once again, he is called to serve and protect Mankind. Now he has a choice: does he brave Remnant alone or does he embrace help?
Crossover - Halo & RWBY - Rated: M - English - Adventure/Friendship - Chapters: 25 - Words: 139,822 - Reviews: 680 - Favs: 1,460 - Follows: 1,892 - Updated: 6/12 - Published: 5/16/2019 - Master Chief/John-117
Justice League of Amazons: Halo by Angry lil' elf reviews
In a world where the rogue Amazon Aresia succeeds in her plan to wipe out all men on Earth, she has doomed humanity to extinction and a newly reformed Justice League must try and salvage the world. But hope is not lost and it comes in the form of a Spartan II Commando and his AI from another universe. His name: Master Chief Petty Officer John-117.
Crossover - Halo & Justice League - Rated: M - English - Sci-Fi/Adventure - Chapters: 14 - Words: 82,700 - Reviews: 296 - Favs: 1,001 - Follows: 1,013 - Updated: 6/11 - Published: 1/13/2016 - Master Chief/John-117, Diana of Themyscira/Wonder Woman, Shiera H./Shayera Hol/Hawkgirl
A Hopeful Voyage by EmperorHueyLong reviews
A Call goes out. A Signal of distress. Earth is in danger, it's cities being wiped out one by one. Monsters prowl the streets, and far worse hide in the shadows. It is the UNSC's job to protect earth from all threats, even if this earth isn't their own. The UNSC will answer the call, as it always has.
Crossover - Halo & Worm - Rated: M - English - Sci-Fi - Chapters: 4 - Words: 13,581 - Reviews: 40 - Favs: 150 - Follows: 195 - Updated: 6/11 - Published: 3/14
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: 7 - Words: 59,515 - Reviews: 266 - Favs: 869 - Follows: 1,204 - Updated: 6/11 - Published: 2/11 - Cortana, Councilor Valern, Councilor Tevos, Councilor Sparatus
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