Mass Effect Crossovers
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The Exiles:A New Power by Johnnieboy11 reviews
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.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 31 - Words: 127,304 - Reviews: 524 - Favs: 1,082 - Follows: 1,530 - Updated: 7/5 - Published: 12/26/2021 - OC, Tali'Zorah, Admiral Hackett, Rael'Zorah
Unknown Territory by giblo126 reviews
Earth was under siege by the Strogg, with no escape in sight. When the Turians find them, they're quick to jump in to the fray. But they just might open up a war none of them saw coming...
Crossover - Quake & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 3 - Words: 4,033 - Reviews: 14 - Favs: 22 - Follows: 29 - Updated: 7/5 - Published: 6/15
Mass Effect demi humans by EclipsePheniox reviews
Long ago on earth demi-humans appeared on earth. Now expanding into the galaxy the other races have to deal with both humans and demi-humans. Mass effect story from beginning to end but with monster people to make it more interesting. Experimental, possible harem
Crossover - Mass Effect & Monster Girl Encyclopedia - Rated: M - English - Adventure/Sci-Fi - Chapters: 47 - Words: 158,680 - Reviews: 65 - Favs: 303 - Follows: 317 - Updated: 7/5 - Published: 8/2/2019
Destiny Lost by Twisted Fate MK 2 reviews
The Gods left remnant together, with the statement they would never return to it or influence it. Only, that wasn't true, was it? The God of light, ever the hypocrite and liar, didn't abandon Remnant. Instead, he reincarnated someone to do his bidding and bring Remnant to them. Cue, the now dead Pyrrha Nikos and the God of Darkness' ideas. / Supporter Requested by Espacole & Spork
Crossover - Mass Effect & RWBY - Rated: M - English - Adventure - Chapters: 89 - Words: 350,547 - Reviews: 862 - Favs: 866 - Follows: 1,144 - Updated: 7/4 - Published: 5/5/2019 - Legion, Pyrrha N., Penny P., God of Darkness
Eezo-Flux Theory by BrozTheBro reviews
Humanity found out that it was not alone in the galaxy. It had earned its place in the galactic community, and made it its goal to strive for unity and prosperity. But the barrier between galaxies is fickle, and another galaxy's mankind may yet make a significant difference in the galaxy's period of peace. The Council will stare down the wonders and horrors of the Collapse.
Crossover - Mass Effect & Starsector - Rated: M - English - Sci-Fi/Adventure - Chapters: 11 - Words: 51,166 - Reviews: 60 - Favs: 110 - Follows: 149 - Updated: 7/2 - Published: 3/11 - Garrus V., Liara T'Soni, Admiral Hackett, C. Pressley
Effected Destiny Part 1 by Viperstrike2 reviews
Our favourite guardian is investigating an anomaly on the moon that grabs him and deposits him onto Eden prime
Crossover - Mass Effect & Destiny - Rated: M - English - Chapters: 21 - Words: 50,718 - Reviews: 46 - Favs: 228 - Follows: 293 - Updated: 7/1 - Published: 12/5/2019
Commander Shepherd Vs The Multiverse by Mace sheperd reviews
Commander Shepherd, The Butcher Of Torfan is already one of the strongest humans. So what happens when he is given the power of The Gamer and sent on a quest across the multiverse? Look out Multiverse, here comes The Butcher Of Torfan and he will slaughter all who defy him.
Crossover - Mass Effect & Manhwa/Korean Comics/만화 - Rated: M - English - Sci-Fi/Romance - Chapters: 3 - Words: 23,969 - Reviews: 2 - Favs: 9 - Follows: 13 - Updated: 6/30 - Published: 5/12 - Tali'Zorah, Shepard
Ascensionis by dxd.belphegor reviews
How different can be two different versions? While the first is in relative peace and tranquility, the second is in an endless war for survival, where each alien species does not hesitate to tear the other's throat out just to save itself. And what would happen if only two far from the most powerful individuals were transported from this very galaxy to the first?
Crossover - Warhammer & Mass Effect - Rated: M - English - Adventure/Fantasy - Chapters: 5 - Words: 11,740 - Reviews: 16 - Favs: 26 - Follows: 36 - Updated: 6/30 - Published: 6/20
Operation ECLIPSE - Apocrypha and Sidestories by HelenTheMoon reviews
Omakes, sidestories and Apocrypha written by me and others for Operation ECLIPSE. The Sidestories are canon, the rest just for fun. Feel free to submit content yourselves! (I'll credit you, obviously)
Crossover - Sonic the Hedgehog & Mass Effect - Rated: T - English - Chapters: 25 - Words: 24,893 - Reviews: 36 - Favs: 26 - Follows: 22 - Updated: 6/30 - Published: 12/25/2023
Mobile Suit - Mass Effect: The First Contact War by Mister Smallville reviews
Two worlds collide, neither prepared for the other. The Solar Sphere Congress -successor to the long gone Earth Federation- unwittingly starts a galactic crisis when it makes first contact with a very angry, very trigger happy Turian Hierarchy.
Crossover - Gundam UC & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 18 - Words: 111,468 - Reviews: 210 - Favs: 370 - Follows: 534 - Updated: 6/30 - Published: 8/7/2023
Cursed by Hookshot25 reviews
Clayton Carmine has only known hate and carnage for so many years. But once he survives the war he hoped to die in, things get strange. When people need help he isn’t one to shy away, and while helping Baird he gets sent to a place in dire need of a man like him. A man that can’t be claimed by death as easily as his kin.
Crossover - Gears of War & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 13 - Words: 221,795 - Reviews: 32 - Favs: 122 - Follows: 145 - Updated: 6/29 - Published: 4/10/2023 - C. Carmine, Samantha B./Sam, Shepard, Tali'Zorah
Earth's Defense by shdowstep reviews
It was too late. Despite the warnings given, the Reapers made their way to Earth, and the Harvest began once more. But the Reaper's miscalculated. Humanity was not alone on Earth - Gaia and Alaya existed as well. And they already had various plans in place to survive an extinction level event.
Crossover - Fate/stay night & Mass Effect - Rated: T - English - Chapters: 3 - Words: 5,699 - Reviews: 90 - Favs: 397 - Follows: 540 - Updated: 6/28 - Published: 2/5/2022
I'll Always Find You by Scififan33 reviews
Sora T'Soni just wanted to keep her family safe, to put her skills to use for her people, so she joined the military. Riku Yamada was running from a past he wished he could forget, grateful to those who saved him, so he joined the Alliance military. The Saren and Sovereign attacked and both their lives changed forever. Something drew them together but how could it work?
Crossover - Kingdom Hearts & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 19 - Words: 79,229 - Reviews: 14 - Favs: 30 - Follows: 30 - Updated: 6/28 - Published: 6/30/2022 - [Riku, Sora] [Liara T'Soni, Shepard]
Star Trek: Utopia Disrupted by SimplyLaggy reviews
In the Federation Year 2411, a vessel conducts first contact, which quickly turns disasterous, for one side. " Our Utopia has been disrupted, and now, we are at war. To defend our Utopia. Out Federation." T for Possible swear words
Crossover - StarTrek: The Next Generation & Mass Effect - Rated: T - English - Chapters: 2 - Words: 3,539 - Reviews: 15 - Favs: 55 - Follows: 72 - Updated: 6/25 - Published: 5/16 - Councilor Tevos, Councilor Sparatus
Bellum Terranum by F35B reviews
Humanity has long since recovered from the effects of the Human-Covenant War, beginning to resettle and rebuild. However a chance encounter with an alien artifact and following contact with the Council leads humanity and the rest of the Milky Way into a twisting conspiracy forging unexpected alliances between each race. A show that the Reapers are all too happy to watch. (Heavy AU)
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 6 - Words: 53,968 - Reviews: 264 - Favs: 556 - Follows: 865 - Updated: 6/24 - Published: 7/31/2023 - Master Chief/John-117, J. Keyes, Illusive Man, Shepard
The N7 and Avatar by EclipsePheniox reviews
Commander Shepard and Avatar Korra have switched places. No one knows how or why, but one thing is for sure it's not good. Both the crew of the Normandy and Team Avatar must team up to solve the problem they both face. Korrasami, Shep/ Miranda. Teen, for now, possibly M later.
Crossover - Mass Effect & Legend of Korra - Rated: T - English - Sci-Fi/Fantasy - Chapters: 6 - Words: 15,954 - Reviews: 1 - Favs: 10 - Follows: 20 - Updated: 6/23 - Published: 3/19 - Miranda L., Shepard, Korra, Asami S.
Eddie Among the Stars by Primordial-wielder reviews
(AU) Being the only adolescence human on a isolated backwater space station while having secret modifications within him due to illegal experimentation is something Eddie has grown to accustom to. But having the only adolescence Tsktskian around falling for him after accidentally saving her life though is something that almost makes him wish that he had died in that laboratory.
Crossover - Mass Effect & Lloyd in Space - Rated: T - English - Sci-Fi/Romance - Chapters: 4 - Words: 19,733 - Reviews: 3 - Favs: 6 - Follows: 10 - Updated: 6/23 - Published: 7/17/2023 - [Eddie H., Brittany B.] SAM, Lloyd N.
Imperium Effect: Terra Rising by Deathwatch Razgriz reviews
The long awaited sequel to UNSC Pheonix Rising. The fledgling Empire has survived it's birthpains, and now looks to the stars to rebuild what was once theirs...
Crossover - Warhammer & Mass Effect - Rated: M - English - Humor/Sci-Fi - Chapters: 19 - Words: 92,931 - Reviews: 356 - Favs: 529 - Follows: 655 - Updated: 6/22 - Published: 8/4/2017
Operation ECLIPSE by HelenTheMoon reviews
Pre-ME1 post-Frontiers Xover, in which the Sonic version of Earth replaces ME Earth. A Batarian planet suddenly turns invisible, and things only get weirder from there. That poor STG agent won't know what hit him, that's for sure. And neither will the rest of the galaxy - once Sonic and Eggman get there. Crossposted on Spacebattles and AO3. Rating may change.
Crossover - Sonic the Hedgehog & Mass Effect - Rated: T - English - Sci-Fi/Fantasy - Chapters: 10 - Words: 104,832 - Reviews: 51 - Favs: 77 - Follows: 103 - Updated: 6/21 - Published: 11/26/2023 - Sonic, Tails, OC
Slayer Effect by XAgent-Venom666X reviews
Flynn Taggart once had a different life, one he could remember before becoming the Slayer. But he has long since put that behind him. Killing the denizens of Hell had become his new reality and he accepted it completely. After vanquishing the Icon of Sin, he was catapulted into another universe he knew from his old life. Now he has new, yet familiar, enemies to Rip and Tear.
Crossover - Doom & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 18 - Words: 88,640 - Reviews: 587 - Favs: 1,798 - Follows: 2,160 - Updated: 6/20 - Published: 11/19/2020 - [OC, Liara T'Soni] Doomguy, Shepard
I'm Nobody by free man writer reviews
He didn't have anything when he was born. Just a name and number. But over time, what he had grew. He, with his friends began to understand that there was more to their existence then just their name and number. They will prove that they were meant to be real. To exist. To become something more than just a Nobody. Co-written and created with Jebest4781. Fem Shepard. Now on Ao3.
Crossover - Kingdom Hearts & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 46 - Words: 805,095 - Reviews: 718 - Favs: 696 - Follows: 728 - Updated: 6/20 - Published: 9/13/2020 - Axel, Roxas, Xion, Shepard
Evil Effect challenge by Zombie Eye reviews
A challenge to see who would take it and send Tanya to face Reapers.
Crossover - Mass Effect & Youjo Senki: Saga of Tanya the Evil - Rated: K - English - Sci-Fi - Chapters: 1 - Words: 299 - Reviews: 2 - Favs: 3 - Follows: 2 - Published: 6/20 - Tanya - Complete
Chronicles of the Galactic Coalition by ThePhantomMedjay reviews
In 2600, Terran Society is unified together by diverse species with highly advance technologies from magic, science, and magi-tech, the Terran Trinity. It is their influence and strength to combat the galactic threat that truly changes the known world for the better. All amid internal strifes, ambitious megastructures, and Terran-kinds resilient nature to face the ultimate test.
Crossover - Harry Potter & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 70,501 - Reviews: 9 - Favs: 73 - Follows: 92 - Published: 6/19 - Harry P., U. Wrex, U. Grunt, Aethyta
Massive Reckoning: Interstellar Assualt by vmoneywashere reviews
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)
Crossover - Halo & Mass Effect - Rated: K+ - English - Sci-Fi - Chapters: 4 - Words: 31,484 - Reviews: 43 - Favs: 240 - Follows: 337 - Updated: 6/18 - Published: 10/9/2023 - P. Cole, OC, Admiral Hackett, Shepard
Avengers: The Reaper War by Nataku's Wrath reviews
During the Battle of New York, the Tesseract overloads and sends the Avengers through time and space to a world of strange aliens, advanced technology, murderous robots, and a race against extinction...maybe it isn't so different after all. MarvelMovieVerseXMassEffect (original trilogy). Rated M for violence, language, and azure. No pairings yet.
Crossover - Mass Effect & Avengers - Rated: M - English - Adventure/Sci-Fi - Chapters: 2 - Words: 36,753 - Reviews: 42 - Favs: 163 - Follows: 240 - Updated: 6/18 - Published: 6/5/2017
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