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Halo and Mass Effect Crossovers
8 Mass Effect: Forward Unto Dawn » by Wiggybaby67 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?
T, English, Sci-Fi & Adventure, chapters: 3, words: 3k+, favs: 24, follows: 40, updated: 9h published: 11/26, Master Chief/John-117, Shepard
306 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: 17, words: 147k+, favs: 441, follows: 638, updated: 9/22 published: 4/21, [Master Chief/John-117, Tali'Zorah] J. Cutter
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: 41, words: 710k+, favs: 1k+, follows: 1k+, updated: 9/8 published: 6/8/2018, SPARTAN-B312/Noble Six, Rookie
109 The Exiles:A New Power » by Johnnieboy11 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.
T, English, Sci-Fi & Adventure, chapters: 5, words: 19k+, favs: 430, follows: 658, updated: 9/2 published: 12/26/2021, OC, Tali'Zorah, Admiral Hackett, Rael'Zorah
3 Mass Effect Terran Effect by The Grandiose Library Work In Progress
T, English, Sci-Fi, words: 695, favs: 28, follows: 37, 8/16
3 Predating Prelates by Lighting wolf knight The one ship that ends up here and it changes so much... Rated T for violence, death, and profanity.
T, English, Adventure & Sci-Fi, words: 827, favs: 7, follows: 13, 8/2, OC, Shepard, Peebee S.
73 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: 3, words: 4k+, favs: 307, follows: 508, updated: 7/6 published: 1/7
38 Xen Effect » by ThePilotArchangel Xen is the gateway between universes and dimensions. It is the place where time, space, physics, and other known rules that define ones life go out the metaphorical window. What will happen when a Child of Xen, a perfect Supersoldier, a Guardian of Humanity, and a Spectre of a Council of aliens find themselves caught up in a war of survival? Find out in "Xen Effect".
T, English, Sci-Fi & Adventure, chapters: 8, words: 73k+, favs: 89, follows: 113, updated: 7/4 published: 4/30, Master Chief/John-117, Cortana, Shepard, OC
60 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: 6, words: 21k+, favs: 195, follows: 261, updated: 6/19 published: 5/29, J. Keyes, J. Cutter, SPARTAN-B312/Noble Six, Jerome-092
897 Heroes UNITE! » by So-Pro Warrior Commander Shepard and his team have gathered together the races of their Galaxy in an effort to defeat the Reapers. But is it enough? When the team comes across a strange woman they find out that if they are to truly defeat the Reapers once and for all. They will need all the help they can get. But not from their Universe. Multiverse Crossover! Chapters 6-22 Being Rewritten!
T, English, Adventure & Sci-Fi, chapters: 49, words: 1514k+, favs: 421, follows: 401, updated: 6/14 published: 6/21/2013, Master Chief/John-117, Shepard
17 The Great Galactic War » by hellothere45 Occurs after the events of Halo Infinite. Cortina finds out about a new enemy from the void of space called the reapers who are trying to rule the galaxy sending a warning to her former allies and enemies to unite the, she assigns chief espranza and the Weapon on a mission to unite the Citadel species to fight a war to end all wars in the Galaxy, can they do this task
T, English, Sci-Fi & Adventure, chapters: 3, words: 4k+, favs: 26, follows: 36, updated: 6/9 published: 6/3
3 Spirit of Fire by GoldenThorns-Fiverr A Crossover fanfic I did as a Fiverr request.
T, English, words: 7k+, favs: 10, follows: 10, 5/24
15 Halo: A New Journey » by mgarner3199 Master Chief wakes up in the Mass Effect universe and joins Commander Shepard in an effort to stop the Reapers. With time running out, can they stop the extinction of every species, or will they fade into legend?First, they got to stop the Reapers though...
K, English, Sci-Fi & Romance, chapters: 3, words: 3k+, favs: 36, follows: 69, updated: 4/27 published: 12/7/2021, Cortana, Master Chief/John-117, Illusive Man, Shepard
1 The voyage of Valiant by Lighting wolf knight There was more on the line... Yet plans and webs were made. Rated T for violence, death, and profanity.
T, English, Sci-Fi & Adventure, words: 811, favs: 5, follows: 9, 4/20, Miranda K., D. Whitcomb, OC, Shepard
128 Noble Effect » by LoneSpartan52 Noble Six was alone after the death of Emile. The Pillar of Autumn had left Reach, leaving the lone Spartan behind. But what if instead of dying on Reach, fighting to his last breath, Six survived? What if he escaped Reach and headed for Earth, only to end up in another galaxy, in another war? Will he agree to fight the reapers alongside aliens? Find out in Noble Effect
T, English, Sci-Fi, chapters: 16, words: 62k+, favs: 359, follows: 505, updated: 4/19 published: 7/3/2020, SPARTAN-B312/Noble Six, Garrus V., Shepard, Javik
9 Spectre » by blackshamrock333 Ce qui ne devait être qu'une simple mission de récupération, pour la commandante Shepard de l'UNSC, a rapidement tourné au cauchemar. Désormais, l'humanité et la citadelle sont au bord de la guerre, inconscient qu'un danger bien plus grand les guette. Deux Shepard ne seront pas de trop pour cette mission.
T, French, Adventure, chapters: 11, words: 31k+, favs: 12, follows: 19, updated: 4/11 published: 9/12/2021
44 Reckoning of the Reclaimers (v2) » by metts101 After the Great War Humanity was a different creature. Their brush with extinction left them cold and vengeful, and so they sought revenge for the transgressions of the Covenant species. With their eradication Humanity, driven by xenophobia, took their position as the unrivalled power in the galaxy. However, will a xenophilic alien federation, in a new galaxy, change their outlook?
T, English, Sci-Fi, chapters: 2, words: 14k+, favs: 253, follows: 372, updated: 4/1 published: 9/24/2021
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: 54, words: 407k+, favs: 1k+, follows: 2k+, updated: 3/21 published: 3/13/2013
8 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: 70, follows: 117, updated: 2/25 published: 11/11/2021, [OC, Vetra N.] T. Hood
1k+ The Unknown Defender » by Gabenator5 While Shepard is closing in on Saren, something odd is happening in the Terminus systems. A new faction stirs, its green-clad enforcers seemingly unstoppable. Rumors spread, pirate bases going dark, both the enslaved and kidnapped alike 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.
T, English, Adventure & Sci-Fi, chapters: 18, words: 121k+, favs: 3k+, follows: 4k+, updated: 1/16 published: 9/27/2016, Master Chief/John-117, Cortana, Tali'Zorah, Leviathan
203 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: 40, words: 98k+, favs: 170, follows: 185, updated: 1/8 published: 1/15/2015, Gravemind
626 Voyage unto Infinity » by supertruckin The USS Voyager comes face to face with the massive ship that is the UNSC Infinity after Voyager's nearly fatal first test of their quantum slipstream drive. Getting home isn't their only issue. They will have to work together in order to unravel the ancient threat that plagues the new galaxy that they find themselves in. Star Trek:Voyager, Mass Effect, and Halo triple crossover
T, English, Sci-Fi & Adventure, chapters: 15, words: 79k+, favs: 1k+, follows: 2k+, updated: 1/2 published: 4/10/2019, Master Chief/John-117, Cortana, Shepard
562 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: 16, words: 81k+, favs: 1k+, follows: 2k+, updated: 12/27/2021 published: 7/26/2019, Master Chief/John-117, Cortana, Zaeed M., OC
71 An Old Machine's New Home » by Edgeoftoday A Reaper is launched from it's home galaxy during one of their many cycles, and spends countless years floating through the empty void of space. It's unintended destination results in the nearly destroyed machine unknowingly put in the middle of a galactic war between a coalition of religeous zealots and an ambitious race expanding over the stars. Picks up at the start of Halo: CE.
T, English, Sci-Fi & Adventure, chapters: 6, words: 29k+, favs: 257, follows: 356, updated: 12/25/2021 published: 8/22/2020, Master Chief/John-117, Arbiter, J. Keyes, Cortana
4 A Halo Effect Challenge by FallenDispair For a writer looking for a Halo/Mass Effect crossover idea. Free range use of what's inside. Details and new combined timeline of the two universes.
T, English, words: 11k+, favs: 18, follows: 17, 12/20/2021
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