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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: 585 - Favs: 1,778 - Follows: 2,135 - 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: 716 - Favs: 690 - Follows: 720 - 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: 58 - Follows: 85 - 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: 7 - Favs: 62 - Follows: 74 - 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: 235 - 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: 41 - Favs: 153 - Follows: 226 - 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: 88 - Follows: 116 - Updated: 6/16 - Published: 4/2 - Skynet, Tali'Zorah, Shepard, Rael'Zorah
The Eternal Cycle by Imperatix reviews
The Eternal Empire has carved its place in the galaxy though unity, duty, and faith. These tenants have allowed them to rule the stars, however it is uncertain times in the galaxy, there is a great darkness looming over the stars. Uncover a galaxy where every decision could unravel the mysteries of the past or doom the future, in a tale of intrigue, peril, and cosmic destiny.
Crossover - Star Wars & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 9 - Words: 21,432 - Reviews: 28 - Favs: 89 - Follows: 111 - Updated: 6/15 - Published: 10/3/2023
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: 10 - Follows: 11 - 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: 606 - Follows: 806 - 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: 2,219 - Follows: 2,666 - 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: 22 - Favs: 109 - Follows: 157 - Updated: 6/14 - Published: 5/18 - Courier, ED-E
Rising from the Embers of Sera by thehappy reviews
The people of Sera rebuild, spreading to the stars. Wars will be waged. Peace will be sought. The Coalition has risen from the ashes to take their right to exist in the galaxy. They will survive...no matter the cost.
Crossover - Gears of War & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 28 - Words: 422,813 - Reviews: 565 - Favs: 755 - Follows: 900 - Updated: 6/14 - Published: 12/28/2020 - OC, U. Wrex, Shepard, Councilor Tevos
Effects of Man by Krotosin reviews
During the shitshow that Eden Prime was, Shepard finds a man buried near the Beacon. With him, two AIs, one from Reach, the other from Typhon. With him at her side, Jane's mission is easier. If it wasn't for the fact he's a hyper-lethal killing machine, with malware stuck in his head. And a bit of am odd case. Mostly Titanfall and Halo, with some (a lot) Deep Rock Galactic.
Crossover - Mass Effect & Titanfall - Rated: M - English - Sci-Fi/Adventure - Chapters: 6 - Words: 37,551 - Reviews: 14 - Favs: 108 - Follows: 137 - Updated: 6/14 - Published: 6/10/2023 - OC
Ark effect Remake by EclipsePheniox reviews
After the attack on the Collector base failed, the Normandy SR-2 found themselves on Ark a planet roaming with primordial beasts. But as their Commander returns, things become more complex as they learn about Ark and the reason they are there and the purpose of the world.
Crossover - Mass Effect & ARK: Survival Evolved - Rated: T - English - Adventure/Sci-Fi - Chapters: 14 - Words: 39,736 - Reviews: 16 - Favs: 72 - Follows: 88 - Updated: 6/14 - Published: 1/3/2023 - Liara T'Soni, Miranda L., Shepard
New Start Plus: in spaaaaace! by omaster43 reviews
Nick Walters and his merry band of misfits are back with a story about helping Shepard and crew fight giant eldritch robot abominations, most likely through Dumb magic and crazy shenanigans This is a continuation of my previous story, so reading that one first is recommended. but I'm not your nanny you wanna be confused that's your choice. Oc-insert, just came from Dragon age
Crossover - Game X-overs & Mass Effect - Rated: M - English - Humor/Adventure - Chapters: 13 - Words: 321,940 - Reviews: 132 - Favs: 357 - Follows: 431 - Updated: 6/13 - Published: 6/6/2023 - Garrus V., Tali'Zorah, Shepard
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: 268 - Favs: 858 - Follows: 1,195 - Updated: 6/12 - Published: 2/6 - Harry P., J. Garson, Shepard
Mass Effect: Spider and Wolf by Night Shadow76 reviews
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: 4,263 - Reviews: 2 - Favs: 8 - Follows: 14 - Published: 6/12 - OC
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: 10 - Favs: 28 - Follows: 39 - Published: 6/11 - Izuku M., Nezu/The Principal
Fall of the Citadel by Richard Scepton reviews
Humanity, a race forged in the complex interactions of war and peace, of bliss and suffering. The Citadel, once great and mighty, now prideful, arrogant, and haughty, the sacrifices of which their foundations had been forged in forgotten to the passage of time. When an ill-fated expedition to open a dormant relay introduces the two together, the consequences...can be catastrophic.
Crossover - Mass Effect & Kantai Collection - Rated: T - English - Romance/Sci-Fi - Chapters: 31 - Words: 301,210 - Reviews: 127 - Favs: 128 - Follows: 182 - Updated: 6/9 - Published: 10/26/2023 - Shepard, Shigure, OC, Fubuki
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: 50 - Favs: 740 - Follows: 887 - 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: 116 - Favs: 428 - Follows: 574 - 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: 4,910 - Reviews: 5 - Favs: 51 - Follows: 69 - Published: 6/5 - [Guardian, Exo Stranger] Shepard, Ghost
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