Mass Effect Crossovers
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United Under Two Skies by Gearman reviews
The story of Rex Craster, Courier Six, and commander Jane Shepard as their worlds collide and both of their realities are forever altered. This Fan fic has been running for several years now, and as such starts out rough and (hopefully) gradually getting better. Please enjoy this labor of love, exploration, and experimentation on my part. I hope you come to love Rex and Jane too.
Crossover - Fallout & Mass Effect - Rated: M - English - Chapters: 41 - Words: 269,708 - Reviews: 93 - Favs: 313 - Follows: 383 - Updated: 7/15 - Published: 7/19/2014 - Courier, Veronica S., Jack, Shepard
Deathwatch: Embers (the Citadel incident) by Imperiumpilled30k reviews
999.m41 the brothers of Kill-Team Embers have been sent on what should have been a routine purging of Orkz in the Octurus sector, however something is a foot, a missing inquisitor and strange device make for a deadly pairing...with this encounter setting forth a much more dangerous chain of events... (RE-WORKED 1st chapter please leave reviews)
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi/Fantasy - Chapters: 4 - Words: 21,599 - Reviews: 9 - Favs: 26 - Follows: 29 - Published: 7/14 - Space Marines, Deathwatch, U. Wrex, Shepard
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: 20 - Words: 60,388 - Reviews: 29 - Favs: 62 - Follows: 65 - Updated: 7/13 - Published: 2/15 - [Ben T., Miranda L.] Ship, Shepard
Pandora Effect by Depressing Rat reviews
In wake of the RDA'S defeat at the hands of the Resistance, Pandora has soon entered a state of unity with the aid of Human Resistance and Avatars by introducing Sky people technology to the Na'vi tribes, this alliance soon forming the Pandoran Alliance.
Crossover - Mass Effect & Avatar - Rated: T - English - Sci-Fi/Fantasy - Chapters: 1 - Words: 495 - Reviews: 3 - Favs: 9 - Follows: 14 - Published: 7/11
Mass Effect Crossover Ideas by Fire Wolf 2132 reviews
I don't have time to write like I used to, so I'll leave these here for anyone interested in the ideas.
Crossover - X-overs & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 1 - Words: 1,063 - Reviews: 2 - Favs: 4 - Follows: 4 - Published: 7/11 - Complete
Spectre Prime by Leopardman reviews
Commander John Shepard sacrificed himself to stop the Reaper War. He later wakes up in a universe completely different from his own. But he will soon show there’s more to him than meets the eye. (Warning: Rated T with minor cursing from Shepard.)
Crossover - Transformers/Beast Wars & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 3 - Words: 8,773 - Reviews: 10 - Favs: 21 - Follows: 24 - Updated: 7/10 - Published: 6/24 - Shepard, Optimus Prime, Ironhide
Kerberos by timedraven117 reviews
Commissioned: The Green Flu struck earth like a meteor, in its clutches billions died, and a new world emerged. Now it is the year 2156 and that which has been dreaded by humanity ever since the truth of the Green Flu has come to pass. First Contact.
Crossover - Mass Effect & Left 4 Dead - Rated: M - English - Sci-Fi - Chapters: 13 - Words: 69,021 - Reviews: 23 - Favs: 158 - Follows: 221 - Updated: 7/9 - Published: 4/23/2021 - Illusive Man, Shepard
Mass Effect-Batman: Crisis On The Citadel by James Keller reviews
After 2 years of operating on Omega, The Dark Knight comes to the Citadel in pursuit of a dangerous new drug that is about to be unleashed upon the very heart of Council Space. This will put him into an alliance with Lt. Garrus Vakarian of C-Sec's Major Crimes Unit as they uncover a massive Conspiracy.
Crossover - Mass Effect & Batman - Rated: M - English - Crime/Mystery - Chapters: 8 - Words: 54,833 - Reviews: 19 - Favs: 47 - Follows: 59 - Updated: 7/9 - Published: 10/29/2021 - Bruce W./Batman, Garrus V., Liara T'Soni, Tali'Zorah
Amongst These Stars by Warlock99 reviews
To bring a revolution that spans the galaxy is a feat very few can accomplish. To create an Empire that covers an entire galaxy is something only Naruto's people can accomplish. Amongst these stars they would rule and the reapers would feel their wrath.
Crossover - Naruto & Mass Effect - Rated: M - English - Adventure - Chapters: 5 - Words: 14,121 - Reviews: 33 - Favs: 184 - Follows: 241 - Updated: 7/9 - Published: 2/22 - Naruto U., Shepard
Feared Reverence by ayab reviews
376 years after the battle between heaven and earth. Two humans have achieved godhood. Using their power to guide humanity to the stars. How will the galaxy react to see a species so advanced yet so primitive? So powerful yet not wanting to use their power. They are what the citadel race aspires to be and hates because of their jealousy.
Crossover - Naruto & Mass Effect - Rated: T - English - Fantasy/Sci-Fi - Chapters: 29 - Words: 114,630 - Reviews: 205 - Favs: 371 - Follows: 472 - Updated: 7/8 - Published: 1/14/2023
Timeline(Spoilers for call of new vegas rework) by Darell441
A timeline for my fallout fanfic and upcoming mass effect fanfic warning it may contain spoilers
Crossover - Fallout & Mass Effect - Rated: T - English - Chapters: 1 - Words: 2,317 - Favs: 1 - Follows: 1 - Published: 7/6 - Complete
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: 1,089 - Follows: 1,540 - 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: 30 - 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: 867 - Follows: 1,143 - Updated: 7/4 - Published: 5/5/2019 - Legion, Pyrrha N., Penny P., God of Darkness
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: 211 - Favs: 374 - Follows: 536 - 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: 223,361 - Reviews: 32 - Favs: 126 - Follows: 149 - 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: 403 - Follows: 548 - 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: 53,712 - Reviews: 270 - Favs: 559 - Follows: 873 - Updated: 6/24 - Published: 7/31/2023 - Master Chief/John-117, J. Keyes, Illusive Man, Shepard
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