Mass Effect Crossovers
Filters
3.5K | Page 1 2 3 4 11 .. Last Next »

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 up
Crossover - Buffy: The Vampire Slayer & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 14 - Words: 23,911 - Reviews: 145 - Favs: 566 - Follows: 764 - Updated: 3h - Published: 10/16/2019 - Xander H., Buffy S., Willow R.
As The Wind Abates by DingusMacGoo reviews
After witnessing the death of his oldest friend, an immortal Harry Potter turns to the stars in an attempt to find meaning in his life.
Crossover - Harry Potter & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 33 - Words: 80,462 - Reviews: 263 - Favs: 796 - Follows: 1,127 - Updated: 22h - Published: 2/6 - Harry P., J. Garson, Shepard
Mass Effect: Spider and Wolf by Night Shadow76
The Spider-verse has been saved, the Inheritors had been defeated, and all is well. Well, except for one Spider. With his home gone and destroyed, he has no where to go, but with aid from Madam Web and The Other, he will have a new home, once that's on the edge of destruction. Now if only he could make sense of how Asari breeding works. Based loosely on the Inheritors storyline.
Crossover - Spider-Man & Mass Effect - Rated: M - English - Adventure - Chapters: 1 - Words: 4,162 - Favs: 1 - Follows: 2 - Published: 6/12
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: 17 - Words: 20,056 - Reviews: 24 - Favs: 22 - Follows: 16 - Updated: 6/12 - Published: 12/25/2023
One Small Step by Bardothren reviews
Izuku opens a door inside a Turian ship and it all goes downhill from there.
Crossover - Mass Effect & My Hero Academia/僕のヒーローアカデミア - Rated: K - English - Sci-Fi/Drama - Chapters: 1 - Words: 2,593 - Reviews: 5 - Favs: 14 - Follows: 14 - Published: 6/11 - Izuku M., Nezu/The Principal
Eezo-Flux Theory by Larry The Mailman 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: 9 - Words: 41,310 - Reviews: 55 - Favs: 95 - Follows: 132 - Updated: 6/11 - Published: 3/11 - Garrus V., Liara T'Soni, Admiral Hackett, C. Pressley
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: 5 - Words: 10,095 - Reviews: 19 - Favs: 41 - Follows: 64 - Updated: 6/11 - Published: 5/14
Mass Effect 10 Ben Second Chance by benguin reviews
Here is a world for both Ben 10 and mass effects Fans, but basically it like any story where ben world is gone and lives in another universe to move on from the pain. I do not Own Ben 10 and Mass effect. They are owned by they respected properties of Man of Action and Bioware. Please support the official release.
Crossover - Ben 10 & Mass Effect - Rated: T - English - Sci-Fi/Romance - Chapters: 17 - Words: 48,718 - Reviews: 29 - Favs: 51 - Follows: 54 - Updated: 6/11 - Published: 2/15 - [Ben T., Miranda L.] Ship, Shepard
Stellar Effect by Brandon Storm reviews
The Reapers trap was perfect in its design. Their execution refined over billions of years, their technology refined since the dawn of time itself. Right up until Someone Broke the Trap!
Crossover - Mass Effect & Stellaris - Rated: T - English - Adventure/Sci-Fi - Chapters: 89 - Words: 389,207 - Reviews: 375 - Favs: 444 - Follows: 561 - Updated: 6/9 - Published: 8/7/2022
The Bureau of Multiverse Affairs by RedFrontWriter
Recruited by the mysterious Lutece twins, a band of heroes are sent on a mission to hunt down the sinister Professor Moriarty as he attempts to become the greatest criminal in the multiverse.
Crossover - Doctor Who & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 16 - Words: 65,806 - Favs: 6 - Follows: 10 - Updated: 6/9 - Published: 3/3 - 4th Doctor, Sarah Jane S., Garrus V., Tali'Zorah
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: 9 - Words: 92,311 - Reviews: 45 - Favs: 73 - Follows: 95 - Updated: 6/9 - Published: 11/26/2023 - Sonic, Tails, OC
Fall of the Citadel by Richard Scepton reviews
A fleet without an ocean, a humanity scarred forever by war. An admiral without a fleet, and a galaxy on the brink of war. It is the link in between, that will decide our fate, and that of the galaxy as a whole. CW: PTSD, depression, hand-to-hand combat and bayonets. Recommend not for children
Crossover - Mass Effect & Kantai Collection - Rated: T - English - Romance/Sci-Fi - Chapters: 31 - Words: 301,203 - Reviews: 115 - Favs: 119 - Follows: 175 - Updated: 6/9 - Published: 10/26/2023 - Shepard, Shigure, OC, Fubuki
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: 4 - Words: 42,235 - Reviews: 19 - Favs: 97 - Follows: 131 - Updated: 6/8 - Published: 5/18 - Courier, ED-E, Shepard
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: 2 - Words: 16,691 - Reviews: 2 - Favs: 7 - Follows: 10 - Updated: 6/7 - Published: 5/12 - Tali'Zorah, Shepard
The Final Olympian by TheSilverboar reviews
Percy Jackson. Alive since before humanity even reached Mars, wandering in solitude. But as Saren tries to destroy the galaxy he can't stand Idly by and returns to Alliance Space to help stop this new threat to his species. (Male Sheppard)
Crossover - Percy Jackson and the Olympians & Mass Effect - Rated: M - English - Sci-Fi/Friendship - Chapters: 6 - Words: 10,226 - Reviews: 48 - Favs: 724 - Follows: 863 - Updated: 6/6 - Published: 11/6/2021 - [Percy J., Tali'Zorah] [Ashley W., Shepard]
The Eternal Lord 40k - ME by HellFox83 reviews
A battle against the forces of Chaos strands a Necron lord in the galaxy of Mass Effect. With what's left of his dynasty under his banner, Veronakh Lord of Solvatakh intends to lead his people to glorious conquest. Can Commander Shepard stop the Collectors and curtail the ambitions of the Necrons?
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 31 - Words: 361,064 - Reviews: 115 - Favs: 420 - Follows: 566 - Updated: 6/6 - Published: 6/13/2020 - Necrons, Shepard
Destiny's Truth by The Elder Sprite Knight reviews
Join the Hunter who died to protect everyone from the Final Shape. He lost everyone in the process. His Ghost, his light, his own life. Now the Traveler has seemed to abandon him, but he soon wakes up with his Ghost and a very familiar Exo Stranger in a universe without of Light and Darkness, and on the verge of extinction. Join the Hunter Jake as he becomes the Guardian yet again.
Crossover - Mass Effect & Destiny - Rated: M - English - Adventure/Sci-Fi - Chapters: 1 - Words: 4,780 - Reviews: 4 - Favs: 29 - Follows: 43 - Published: 6/5 - [Guardian, Exo Stranger] Shepard, Ghost
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: 17 - Words: 103,066 - Reviews: 194 - Favs: 359 - Follows: 520 - Updated: 6/4 - Published: 8/7/2023
Never Fade Away by Ideas-Guy reviews
Lives are cheap and money is everything. That's how the orphanage made its money - lending out children for human expirementation. L is an old man at the age of fifteen and he knows he doesn't have much time left. All that mattered was getting out, but he soon learns that the world is a lot bigger than Night City. And that the galaxy is a lot bigger than Earth.
Crossover - Mass Effect & Cyberpunk 2077 - Rated: M - English - Adventure/Drama - Chapters: 68 - Words: 308,435 - Reviews: 541 - Favs: 1,291 - Follows: 1,380 - Updated: 6/3 - Published: 10/31/2022 - Shepard, V - Complete
Remnants by General Rage reviews
From Halo's ashes, a mismatched Alliance is born. UNSC soldiers now serve alongside both Batarian deserters and shifty Jackal Space Pirates. Now Shepard and Master Chief have to keep these strange bedfellows from killing one another before they can stop an emergent new threat to the galaxy. The Next Swashbuckling Chapter of the Wormhole Chronicles.
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 43 - Words: 910,922 - Reviews: 854 - Favs: 514 - Follows: 590 - Updated: 6/2 - Published: 4/22/2016 - Master Chief/John-117, Cortana, Tali'Zorah, Shepard
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: 24 - Words: 88,237 - Reviews: 163 - Favs: 566 - Follows: 842 - Updated: 6/2 - Published: 7/8/2022 - Rookie, Shepard
Exodus Into Fire by keita52 reviews
When the Battlestar Galactica, guided by Starbuck, makes the jump towards Earth, they find a planet encircled by giant black ships and a woman calling herself Commander Shepard telling them to leave before the Reapers attack them. With Earth not the safe haven they'd hoped for, the Colonial Fleet and their Cylon allies struggle to make a place for themselves in this new universe.
Crossover - Battlestar Galactica: 2003 & Mass Effect - Rated: M - English - Sci-Fi/Drama - Chapters: 18 - Words: 72,496 - Reviews: 123 - Favs: 325 - Follows: 464 - Updated: 6/1 - Published: 11/12/2014 - K. Thrace/Starbuck, Ashley W., 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: 11 - Words: 57,222 - Reviews: 63 - Favs: 127 - Follows: 166 - Updated: 5/31 - Published: 4/26 - Liara T'Soni, Tali'Zorah, Miranda L., Shepard
Star-Bound by The Incredible Muffin reviews
Some destinies are written out centuries, or even millennia, ahead of time. However, when destiny is derailed, new plans have to be implemented. Sometimes, that involves ripping someone away from the peaceful end they seek and thrusting them into a tide of never-ending war in order to fix what can never be repaired.
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi/Supernatural - Chapters: 40 - Words: 273,968 - Reviews: 1166 - Favs: 1,529 - Follows: 1,863 - Updated: 5/29 - Published: 5/29/2019
Book One: Harvest by Believer218 reviews
The year is 2583. Humanity stands strong, even twenty-six years after a disastrous first contact. But it seems that wherever they go, war will follow. And this war will grip the galaxy like no other. The first adventure of Mass Effect: The Reclaimer Saga. Rated M for graphic depictions of violence.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 5 - Words: 27,511 - Reviews: 82 - Favs: 78 - Follows: 118 - Updated: 5/28 - Published: 4/4 - [Master Chief/John-117, Ashley W.] Arbiter, Saren A.
3.5K | Page 1 2 3 4 11 .. Last Next »