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Halo and Mass Effect Crossovers
120 The Sword of the Geth » by Doctor poo and the TURDIS 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.
T, English, Sci-Fi & Humor, chapters: 9, words: 35k+, favs: 317, follows: 450, updated: 6h published: 11/23, Cortana, Shepard
22 Massive Reckoning: Interstellar Assualt » by vmoneywashere In the 2700s, the Milky Way is flourishing. Access to Forerunner ruins has allowed the races of the galaxy to explore their home and new galaxies. Now, a new fleet, lead by an Ancient Punic Class Fleet Carrier, is moving to explore a new galaxy. Soon enough, the UNSC will find itself embroiled in a new Great War, with a few standing in the way of mass extinction. (slow updates)
K+, English, Sci-Fi, chapters: 2, words: 14k+, favs: 120, follows: 177, updated: 11/30 published: 10/9, P. Cole, OC, Admiral Hackett, Shepard
1k+ All the Stars » by BlueWay 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.
T, English, Sci-Fi & Adventure, chapters: 46, words: 802k+, favs: 1k+, follows: 2k+, updated: 11/9 published: 6/8/2018, SPARTAN-B312/Noble Six, Rookie, Shepard
439 The Sins of our Fathers » by MarkerMagnum 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.
T, English, Drama & Sci-Fi, chapters: 10, words: 97k+, favs: 1k+, follows: 1k+, updated: 10/30 published: 2/11, Cortana, Councilor Valern, Councilor Tevos, Councilor Sparatus
33 Mass Effect: Forward Unto Dawn » by WildcatWarrior67 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.
T, English, Sci-Fi & Adventure, chapters: 4, words: 7k+, favs: 158, follows: 292, updated: 10/14 published: 11/26/2022, Master Chief/John-117, Cortana, Shepard
154 Bellum Terranum » by F35B 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)
T, English, Sci-Fi, chapters: 6, words: 29k+, favs: 335, follows: 513, updated: 9/30 published: 7/31
630 It Started At Shanxi » by SpaceTurtleOX Fifty years after the end of the Human-Covenant War an ill-fated UNSC expedition opens Relay 314, revealing a civilization unprepared for their arrival, and relics from a terrible past.
T, English, Sci-Fi & Adventure, chapters: 17, words: 90k+, favs: 1k+, follows: 2k+, updated: 9/16 published: 7/26/2019, Master Chief/John-117, Cortana, Zaeed M., OC
11 Spectre with a Spartan Sister » by ZeBear 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?
T, English, Sci-Fi, chapters: 5, words: 6k+, favs: 54, follows: 88, updated: 8/20 published: 7/28, [Shepard, Tali'Zorah] Garrus V.
1k+ The Unknown Defender » by Gabenator5 A new faction stirs, its green-clad enforcers seemingly unstoppable. Rumors spread, pirate bases go dark, and both the enslaved and kidnapped are discovered free. Who are these new interlopers, and what is their goal? For good or ill, the powers that be intend to find out. REWORK COMPLETED.
T, English, Adventure & Sci-Fi, chapters: 19, words: 153k+, favs: 4k+, follows: 5k+, updated: 7/30 published: 9/27/2016, Master Chief/John-117, Cortana, Tali'Zorah, Leviathan
344 Unknown events have unmeasurable answers » by El callampas When someone contacts the Quarians about old machinery, they should think twice before engaging with a strange yet so familiar species, a war, and circumstances that will shock two galaxies now that the rift is open.
T, English, Sci-Fi & Drama, chapters: 19, words: 171k+, favs: 584, follows: 816, updated: 6/25 published: 4/21/2022, [Master Chief/John-117, Tali'Zorah] J. Cutter
44 On the Shoulders of Giants by Shoot The Runner 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?
T, English, Sci-Fi & Adventure, words: 9k+, favs: 291, follows: 407, 6/20, Master Chief/John-117, T. Hood, Shepard, D. Udina
3 Un grand angle d'ombre » by blackshamrock333 2560. L'humanité a survécu à la grande guerre contre les covenants et découvert l'espace concilien. Le Longest Day, prowler de l'UNSC en mission secrète, débarque en pleine attaque d'une colonie frontalière. Quelques jours plus tard, un médecin humain est découvert assassiné sur la Citadelle. Deux événements aléatoires, annonciateurs d'une course pour sauver la galaxie.
T, French, Sci-Fi & Adventure, chapters: 3, words: 35k+, favs: 7, follows: 11, updated: 5/9 published: 1/27
4 A fanfic idea of mine by Fantasy-and-SciFi-Lover Posting in both fanfiction and crossover sections.
T, English, Sci-Fi & Adventure, words: 624, favs: 3, follows: 5, 4/24
14 Operation Hidden Paths: A Halo-Mass Effect Crossover by pj6778457 story of a new universe where the System Alliance has been replaced by the Unified Earth Government (UEG). Set in the worlds of Halo and Mass Effect
T, English, Adventure, words: 1k+, favs: 65, follows: 117, 4/11
Crucible of Clans by Lighting wolf knight He would have his revenge upon Atriox And he might up even doing things he didn't expect. Rated T for violence, death, and profanity
T, English, Sci-Fi & Mystery, words: 814, favs: 2, follows: 3, 4/11, OC, Atriox, Liara T'Soni, O. Petrovsky
House divided by Lighting wolf knight Leading a house was hard. Leading one in a new galaxy? Even harder. Rated T for violence, death, and profanity.
T, English, Sci-Fi & Adventure, words: 803, favs: 4, follows: 3, 4/11, OC, Warden Eternal, Tali'Zorah, Illusive Man
215 Accounts of the Flood conflicts » by hunter 139 A multicrossover series of one-shots depicting several franchises and their encounters with the Flood. I do not own Halo or any other franchises depicted in these stories.
T, English, Horror & Sci-Fi, chapters: 41, words: 103k+, favs: 187, follows: 203, updated: 3/17 published: 1/15/2015, Gravemind
1 Drop into Hell » by Lighting wolf knight They have a lot more to do before its done. Rated T for violence, death, and profanity.
T, English, Adventure & Romance, chapters: 3, words: 11k+, favs: 18, follows: 27, updated: 3/8 published: 2/3, Miranda K., OC, Admiral Hackett, Shepard
1k+ The Reclamation » by Fade Maybe Through ONI's manipulation, the UNSC stumbles upon a Mass Relay and is dragged into a new war. They'll discover the battered races of the Citadel, the political intrigue of its factions, and a second group of humans governed by the Systems Alliance, divided by Cerberus, and lead by Commander Shepard. Yet no one can stop what is to come: the Reclamation, and the death of the galaxy.
T, English, Drama & Suspense, chapters: 55, words: 409k+, favs: 1k+, follows: 2k+, updated: 2/27 published: 3/13/2013
7 Operation Terra Sunrise HALO ( AU) x ME ( AU) » by SimplyLaggy The Endless Swarm, known as the Reapers. Mostly defeated by the forerunners, yet after the death of almost all forerunners, they return. Now, the Reclaimers face them. Join Rebecca Shepard, a OMI Long-term undercover operative, as she goes undercover as Jane Shepard on Terra, Systems Alliance Earth, which was made by Ancient Humanity, as a ancient human remnant AI watches.
T, English, chapters: 2, words: 4k+, favs: 61, follows: 87, updated: 2/16 published: 2/9, Illusive Man, Shepard
2 The USSC: A Timeline by SimplyLaggy A timeline of my USSC fanfic base. Feel free to use what's inside, but please gib me credit : REVAMP OUT 28/2/23 ENJOY
T, English, Sci-Fi, words: 1k+, favs: 17, follows: 15, 2/8
10 Immortal Galaxies » by Lighting wolf knight An escape from an overrun galaxy lands them in another galaxy? What does being the biggest fish in the water gain you in a world without heavy hitters? Rated T for violence, death, and profanity.
T, English, Romance & Adventure, chapters: 3, words: 4k+, favs: 98, follows: 160, updated: 1/13 published: 11/11/2021, [OC, Vetra N.] T. Hood
71 United Earths Empire: The Beginning of a New Age » by Destarien What if three Universes once separate come together. three different humanities with three different paths of technology merge into one galaxy. Citadel space will never be the same because the Schahl Empire and UNSC are here. Two Civilizations, one at war and one ready for war.
T, English, Fantasy & Sci-Fi, chapters: 8, words: 21k+, favs: 213, follows: 280, updated: 1/5 published: 5/29/2022, J. Keyes, J. Cutter, SPARTAN-B312/Noble Six, Jerome-092
29 Mass Effect Kills Halo by giblo126 I was frustrated and wanted to get something out.
K+, English, words: 495, favs: 2, follows: 2, 1/1
98 No Greater Calling » by silencewillfall0091 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.
T, English, Sci-Fi, chapters: 4, words: 6k+, favs: 449, follows: 700, updated: 12/4/2022 published: 1/7/2022
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