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War of the Hearts by World Archivist reviews
The Human-Covenant war had left an undeniable scar on the galaxy. Now in the year 2553, a new enemy shall appear, and a new war shall begin, one with origins in a time before the Halo Array.
Crossover - Halo & Kingdom Hearts - Rated: M - English - Sci-Fi - Chapters: 5 - Words: 4,918 - Reviews: 2 - Favs: 6 - Follows: 9 - Updated: 8/19 - Published: 4/19
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: 26 - Words: 75,620 - Reviews: 123 - Favs: 148 - Follows: 172 - Updated: 8/18 - Published: 1/30/2021 - Neo-Queen Serenity, OC
A Better Tomorrow by DLTA-BOT reviews
How can one man change a world ravaged by corruption, war, and poverty? And if that world isn't his own, why would he want to? In a life built out of discontent and fear, maybe the opportunity for change lies in a new place and a fresh start. A new beginning. And, maybe, he can look forward to a better tomorrow. - A companion story to Wrong Place, Right Time: A Hero's Story.
Crossover - Halo & Cyberpunk 2077 - Rated: T - English - Sci-Fi/Adventure - Chapters: 6 - Words: 56,528 - Reviews: 30 - Favs: 172 - Follows: 208 - Updated: 8/18 - Published: 4/16 - OC, V, Johnny Silverhand, Rogue A.
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: 32 - Words: 213,084 - Reviews: 258 - Favs: 533 - Follows: 604 - Updated: 8/18 - Published: 4/17/2022 - Clark K./Kal-El/Superman, Master Chief/John-117 - Complete
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: 28 - Words: 100,769 - Reviews: 189 - Favs: 607 - Follows: 893 - Updated: 8/18 - Published: 7/8/2022 - Rookie, Shepard
Forward Unto Dawn by TheWizardofOzbourne reviews
Triple Crossover, TSCC/Halo w/Star Trek: Voy/DS9/TNG elements. Trapped in a universe similar to our own, Cameron and John Henry struggle to return home. To do so, three gifts, each from another universe, will get them home and entangle them in a war they thought they knew. Eventual Jameron and MC/Cortana. Updated! 08/14/2024 CH52 Posted!
Crossover - Terminator: Sarah Connor Chronicles & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 52 - Words: 412,770 - Reviews: 622 - Favs: 289 - Follows: 351 - Updated: 8/14 - Published: 3/26/2013 - [John C., Cameron] [Cortana, Master Chief/John-117]
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: 14 - Words: 156,355 - Reviews: 173 - Favs: 502 - Follows: 647 - Updated: 8/14 - Published: 3/2/2022 - SPARTAN-B312/Noble Six, No. 12/Hibiki, No. 11/Hikari, No. 16/Toyotama
If i could soar through the stars by Legotrix reviews
as a shining star, we shine brightly and intense but in the end, we are destined to fade, Being x lost and Tanya simply did not win, but surprisingly they are not in Limbo, if not in a forgotten place that was believed to be empty, but it seems that a fallen god and the saint has a past so distant that both have forgotten.
Crossover - Youjo Senki: Saga of Tanya the Evil & Halo - Rated: T - English - Sci-Fi - Chapters: 11 - Words: 17,666 - Reviews: 4 - Favs: 6 - Follows: 14 - Updated: 8/14 - Published: 8/10 - C. Halsey, Tanya, OC, Viktoriya
Halos, Bullets and Buckshot:The Human-Covenant War by Johnnieboy11 reviews
After discovering a strange artifact in the abandoned Abydos Desert, the girls of the Foreclosure Task Force mistakenly activate it, sending themselves to a new and alien reality, one where humanity is in the brink as an Alien Armada bears down upon her worlds and death looms ever so close to them. Their hope for survival now rests on their own skill, a little luck... And the Halos
Crossover - Halo & Blue Archive - Rated: M - English - Sci-Fi/Horror - Chapters: 4 - Words: 16,613 - Reviews: 17 - Favs: 100 - Follows: 130 - Updated: 8/14 - Published: 2/15 - Master Chief/John-117, A. J. Johnson, SPARTAN-B312/Noble Six, OC
The Demon Of The Nine-Nine by SSJ Lone Wolf reviews
It had been ten years since Noble Six joined the NYPD, following the fall of Reach, quickly moving through the ranks and making detective, but when he is transferred to the 99th precinct he finds his life flipped upside down when he had to work alongside the eccentric squad of the Nine-Nine. If his own past doesn't drive him insane...they certainly will!
Crossover - Halo & Brooklyn Nine-Nine - Rated: M - English - Chapters: 23 - Words: 183,890 - Reviews: 806 - Favs: 1,086 - Follows: 1,194 - Updated: 8/13 - Published: 10/5/2021 - [SPARTAN-B312/Noble Six, Amy S, Rosa D.]
Knights of Sidonia & Halo Forward unto Dawn Crossover by Coolslick78 reviews
A new day dawns upon a parallel universe. The crew of Sidonia has colonized lem. It continues its journey through space searching for other soler systems but on an advanced mining mission, they discover a mysterious ship suspended inside an enormous ice asteroid. Apon searching the derelict ship they find its named "The UNSC Forward unto Dawn" with one crew onboard.
Crossover - Halo & Knights of Sidonia/シドニアの騎士 - Rated: K - English - Romance/Sci-Fi - Chapters: 3 - Words: 8,471 - Reviews: 5 - Favs: 3 - Follows: 8 - Updated: 8/12 - Published: 8/1 - Tanikaze N., Izana S., Yuhata M.
Halo Effect by kamilospl1312 reviews
What if UNSC replace System Allience from Mass Effect
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 1 - Words: 2,001 - Reviews: 19 - Favs: 35 - Follows: 63 - Published: 8/12
The Defenders of Humanity by Johnnieboy11 reviews
After the Battle on Mantle's Approach, the Master Chief and his companion AI, Cortana, find themselves in a strange time and place. To survive, the two and those that would come to follow them shall seek allegiance to Earth's Mightiest Heroes, in order to prepare for and counter a great threat to not just mankind, but the wider Universe.
Crossover - Halo & Avengers - Rated: M - English - Adventure/Sci-Fi - Chapters: 6 - Words: 23,742 - Reviews: 66 - Favs: 369 - Follows: 481 - Updated: 8/10 - Published: 3/12/2022 - [Cortana, Master Chief/John-117] Captain America/Steve R., Iron Man/Tony S.
A different journey by Dragon Cat84 reviews
The Master Chief is found by the Atlantis Expedition, how did the Master Chief end up in the early 21st Century and in the Pegasus Galaxy?
Crossover - Halo & Stargate: Atlantis - Rated: T - English - Chapters: 9 - Words: 35,356 - Reviews: 44 - Favs: 83 - Follows: 130 - Updated: 8/10 - Published: 3/24
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/Drama - Chapters: 45 - Words: 202,477 - Reviews: 431 - Favs: 489 - Follows: 616 - Updated: 8/9 - Published: 9/20/2022 - Samus A., Adam, Master Chief/John-117, Cortana
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: 20 - Words: 109,230 - Reviews: 373 - Favs: 1,205 - Follows: 1,229 - Updated: 8/9 - Published: 1/13/2016 - Master Chief/John-117, Diana of Themyscira/Wonder Woman, Shiera H./Shayera Hol/Hawkgirl
Galactic Conflicts: Tales of First Contact by TheDoctor1998 reviews
Humanity and its allies have stood strong after the Great War with the Covenant. Follow the Systems Alliance as it goes through a first contact nearly as disastrous as the one that lead to the Great War.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 9 - Words: 41,377 - Reviews: 210 - Favs: 440 - Follows: 610 - Updated: 8/7 - Published: 2/6/2023
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: 6 - Words: 157,988 - Reviews: 4 - Favs: 38 - Follows: 45 - Updated: 8/7 - Published: 9/8/2023 - Master Chief/John-117, Samus A.
HELLDIVERS:The Chance Encounter by Johnnieboy11 reviews
Super Earth is at war! In the Galactic West, the Automatons unleash their socialist horror upon the peoples of Super Earth. In the East, meanwhile, Terminids escaped from their cages bring forth destruction on our Colonies! Though, even amidst these trying times, hope remains! Newfound allies have entered the fight for Managed Democracy! Their name? The United Nations Space Command
Crossover - Helldivers & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 9 - Words: 36,153 - Reviews: 116 - Favs: 304 - Follows: 365 - Updated: 8/6 - Published: 3/2 - Master Chief/John-117, A. J. Johnson, Arbiter, SPARTAN-B312/Noble Six
Kingmaker by Temujin the Obliterator reviews
In the midst of a Cold War between the CIS and the UNSC. An ONI agent and an ARC trooper discover a more sinister plot beneath the surface and most work together to orchestrate a coup against the Chancellor.
Crossover - Star Wars & Halo - Rated: M - English - Adventure - Chapters: 5 - Words: 64,613 - Reviews: 5 - Favs: 15 - Follows: 26 - Updated: 8/6 - Published: 4/12
The mark of the federation of independent species by migos501 reviews
(TESTING PHASE)“A single event can shape our lives or change the course of history.” United under a single banner, the federation stands as a testament that any species can thrive in harmony, gifted with technology that can tip the scale of an entire galaxy, they now face with a entirely new government and it’s sets of challenges(focusing on the mass effect story)
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 3 - Words: 82,248 - Reviews: 45 - Favs: 112 - Follows: 144 - Updated: 8/6 - Published: 10/6/2023 - Master Chief/John-117, Shepard
A Phoenix's Rebellion by SPARTAN REAPER-9060 reviews
The Spirit Of Fire, a veteran ship of the Human-Covenant War but declared Lost With All Hands by the UNSC on February 10, 2534. Mysteriously the ship appeared over Earth but an Earth they never knew before. Rated M for my Language.
Crossover - Halo & Code Geass - Rated: M - English - Chapters: 6 - Words: 15,513 - Reviews: 11 - Favs: 84 - Follows: 102 - Updated: 8/4 - Published: 8/31/2021 - J. Cutter, Jerome-092, Lelouch L., Nunnally L.
Buzzard Buccaneer Radio by General Rage reviews
Boz the Buzzard hosts this pirate radio station, beaming out music to the Normandy, Fallen Serpent, Crusty Chorka and Ascendant Justice non-stop. BBR has only one mission, to keep Rock n Roll alive in the dark void of outer space. A companion story to "Remnants" that shows what happens while Shepard is off playing hero. Part of the Wormhole Chronicles Saga.
Crossover - Halo & Mass Effect - Rated: M - English - Humor/Sci-Fi - Chapters: 12 - Words: 93,530 - Reviews: 102 - Favs: 108 - Follows: 120 - Updated: 8/4 - Published: 9/21/2016 - OC
Were it So Easy by Sigma0327 reviews
Six's life was a giant war. Every battle was a test of sheer tenacity and stubbornness against insurmountable odds. Every moment, every bullet fired, every Covenant, Insurrectionist, and Flood spore killed has led up to his last fight. Once again he was one of the few that stood between Earth and her enemies. This would be his final battle, and nothing could change that, right?
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 13 - Words: 171,604 - Reviews: 250 - Favs: 1,095 - Follows: 1,543 - Updated: 8/3 - Published: 11/9/2020 - SPARTAN-B312/Noble Six, Tali'Zorah, Miranda L., Shepard
Burning Stars by Lighting wolf knight reviews
When a fight with the Hive takes the Cabal and Humanity to another galaxy, a perilous alliance must be formed between the two groups. Rated T for violence, death, and profanity.
Crossover - Halo & Destiny - Rated: T - English - Adventure/Sci-Fi - Chapters: 2 - Words: 2,908 - Reviews: 2 - Favs: 17 - Follows: 25 - Updated: 8/3 - Published: 5/14 - Prophet of Truth, 343 Guilty Spark, OC, Lady Efrideet
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