Mass Effect Crossovers
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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: 369 - Follows: 532 - 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: 121 - 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: 395 - Follows: 537 - 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]
The Reclaimer Wars:The Reaper Crisis by Johnnieboy11 reviews
Six months prior to the worst crisis the normal Milky Way would face, Commander Shepard hunts the Collectors abducting human colonists in the Terminus Systems when she comes upon a terrifying new sight:Three Intergalactic fleets arrayed against each-other and her sole Frigate. Three new factions, one seeking a home and two seeking answers, all linked by the Star Roads.
Crossover - Game X-overs & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 12 - Words: 61,282 - Reviews: 67 - Favs: 140 - Follows: 183 - Updated: 6/27 - Published: 4/26 - Liara T'Soni, Tali'Zorah, Miranda L., 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: 552 - Follows: 861 - 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: 355 - Favs: 529 - Follows: 654 - 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: 586 - Favs: 1,794 - Follows: 2,157 - 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: 717 - Favs: 694 - Follows: 724 - 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: 1 - Favs: 2 - Follows: 2 - Published: 6/20 - Tanya - Complete
An intriguing result by ReligiousZealot reviews
The Turians, the military arm of the Council and the galaxy's peacekeepers, initially stood alone during their encounter with the Council. However, what if they hadn't been alone? What if their first contact wasn't solely with the Council? Imagine if they had an unexpected ally—a species unlike any other: the Zerg collective
Crossover - StarCraft & Mass Effect - Rated: T - English - Mystery/Suspense - Chapters: 6 - Words: 11,814 - Reviews: 21 - Favs: 60 - Follows: 89 - Updated: 6/19 - Published: 5/14
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: 8 - Favs: 67 - Follows: 85 - 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: 239 - Follows: 335 - 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: 159 - Follows: 234 - Updated: 6/18 - Published: 6/5/2017
Five Nights In Mass Effect by Mace sheperd reviews
At Relay 314, The Turians made contact with a race that would become known as The Boogeyman of The Citadel. A race that openly violates every Council Law. This is The story of Humanity, the strongest race.
Crossover - Mass Effect & Five Nights at Freddy´s - Rated: M - English - Sci-Fi/Parody - Chapters: 1 - Words: 3,987 - Reviews: 4 - Favs: 3 - Follows: 8 - Published: 6/17 - Shepard
IN POSTERUM HOMINUM by ORION-ARM reviews
[SYSTEMS ONLINE] [ACCESSING DATA] . . . [ACCESS GRANTED] [ACCESSING CAMERA] [ACCESS GRANTED] . . . . . . . . . . . . [I UNDERSTAND MY PURPOSE NOW] [I WILL PROTECT HUMANITY AT ALL COSTS]
Crossover - Terminator & Mass Effect - Rated: K - English - Adventure/Sci-Fi - Chapters: 3 - Words: 6,023 - Reviews: 17 - Favs: 91 - Follows: 119 - Updated: 6/16 - Published: 4/2 - Skynet, Tali'Zorah, Shepard, Rael'Zorah
Guardian of Humanity by DarkRock
This is a possible future of "The Gods Bleed" story.
Crossover - Naruto & Mass Effect - Rated: M - English - Adventure/Mystery - Chapters: 1 - Words: 1,651 - Favs: 11 - Follows: 13 - Published: 6/15 - Naruto U.
Ship of The Line – Effect 31 by Knife Hand reviews
Bored with how things are going to play out, Janus interferes more directly in Halloween, making things more interesting and changing the course of the entire Galaxy. (Buffy/Star Trek/Mass Effect) - Chapter 14, 15 & 16 up
Crossover - Buffy: The Vampire Slayer & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 16 - Words: 26,162 - Reviews: 161 - Favs: 607 - Follows: 809 - Updated: 6/15 - Published: 10/16/2019 - Xander H., Buffy S., Willow R.
Saiyan Effect by bored peasant reviews
The Citadel Council weren't ready for a species with the power of the saiyans at their back.
Crossover - Mass Effect & Dragon Ball Super - Rated: T - English - Sci-Fi/Adventure - Chapters: 21 - Words: 125,185 - Reviews: 918 - Favs: 2,221 - Follows: 2,670 - Updated: 6/14 - Published: 8/9/2017 - Son Gohan, Son Goku, Vegeta
The Courier Effect by jabinker reviews
After the 2nd Battle of Hoover Dam Courier Six thought he could relax, maybe even take ED-E along for some fun but after something happens with the transporter to the Big MT both Courier and ED-E find themselves in a brand new setting only seen in a sci-fi epic! Join both heroes as they try to survive and navigate this new setting while making new friends and enemies along the way.
Crossover - Fallout & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 5 - Words: 47,458 - Reviews: 24 - Favs: 115 - Follows: 163 - Updated: 6/14 - Published: 5/18 - Courier, ED-E
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