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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: 10 - Words: 45,663 - Reviews: 55 - Favs: 98 - Follows: 134 - Updated: 1h - Published: 3/11 - Garrus V., Liara T'Soni, Admiral Hackett, C. Pressley
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: 571 - Favs: 1,725 - Follows: 2,072 - Updated: 6h - 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: 710 - Favs: 683 - Follows: 711 - Updated: 8h - Published: 9/13/2020 - Axel, Roxas, Xion, Shepard
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: 23 - Words: 92,975 - Reviews: 401 - Favs: 996 - Follows: 1,439 - Updated: 13h - Published: 12/26/2021 - OC, Tali'Zorah, Admiral Hackett, Rael'Zorah
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: 1 - Words: 1,458 - Reviews: 1 - Favs: 6 - Follows: 8 - Published: 6/20
Evil Effect challenge by Zombie Eye
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 - 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: 48 - Follows: 72 - 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: 4 - Favs: 25 - Follows: 33 - 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: 42 - Favs: 225 - Follows: 321 - 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: 37 - Favs: 135 - Follows: 204 - Updated: 6/18 - Published: 6/5/2017
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: 20 - Words: 22,311 - Reviews: 30 - Favs: 23 - Follows: 19 - Updated: 6/18 - Published: 12/25/2023
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: 3 - Favs: 2 - Follows: 5 - 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: 16 - Favs: 79 - Follows: 101 - Updated: 6/16 - Published: 4/2 - Skynet, Tali'Zorah, Shepard, Rael'Zorah
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: 90 - Words: 393,357 - Reviews: 378 - Favs: 449 - Follows: 563 - Updated: 6/16 - 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: 17 - Words: 71,443 - Favs: 6 - Follows: 10 - Updated: 6/16 - Published: 3/3 - 4th Doctor, Sarah Jane S., Garrus V., Tali'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: 87 - Follows: 109 - 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: T - English - Adventure/Mystery - Chapters: 1 - Words: 1,651 - Favs: 8 - Follows: 9 - Published: 6/15 - Naruto U.
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: 1 - Words: 1,454 - Reviews: 4 - Favs: 9 - Follows: 10 - Published: 6/15
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: 160 - Favs: 599 - Follows: 797 - 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: 910 - Favs: 2,207 - Follows: 2,651 - 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: 21 - Favs: 103 - Follows: 145 - 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: 561 - Favs: 749 - Follows: 890 - 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: 107 - Follows: 132 - 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
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: 156,787 - Reviews: 64 - Favs: 298 - Follows: 312 - Updated: 6/14 - Published: 8/2/2019
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