Mass Effect Crossovers
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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: 39 - Words: 829,112 - Reviews: 808 - Favs: 469 - Follows: 535 - Updated: 8/7 - Published: 4/22/2016 - Master Chief/John-117, Cortana, Tali'Zorah, Shepard
The Sins of our Fathers by MarkerMagnum reviews
Unknown to the Citadel Council, the Human-Covenant war nears its vicious end. Miranda Keyes is seconds too slow. Delta Halo fires, leaving UNSC space as a lifeless snapshot in time. The Citadel must morn the loss of a civilization they never knew.
Crossover - Halo & Mass Effect - Rated: T - English - Drama/Sci-Fi - Chapters: 9 - Words: 84,696 - Reviews: 380 - Favs: 1,062 - Follows: 1,467 - Updated: 8/7 - Published: 2/11 - Cortana, Councilor Valern, Councilor Tevos, Councilor Sparatus
Stellar Effect Codex by Brandon Storm reviews
A Codex exploring the History and Lore of the Stellar Effect Universe
Crossover - Mass Effect & Stellaris - Rated: T - English - Sci-Fi - Chapters: 16 - Words: 34,645 - Reviews: 25 - Favs: 40 - Follows: 39 - Updated: 8/6 - Published: 8/7/2022
A Metal Guardian by JawsOnYou67 reviews
The Universal Century, only a few short years ago humanity nearly eradicated itself to the tune of a madman, now it spreads, free of most of its old hatred. Yet the galaxy won't let them rest. Terminal prepares the twin Queens as best it can. (Gundam x Mass Effect)
Crossover - Gundam UC & Mass Effect - Rated: T - English - Sci-Fi/Humor - Chapters: 21 - Words: 105,199 - Reviews: 129 - Favs: 346 - Follows: 431 - Updated: 8/4 - Published: 8/18/2020 - Amuro R., Char A., Tali'Zorah, Admiral Hackett
When magic decides one war isn't enough by Alykto reviews
Following Voldemort's return after the Triwizard Tournament, Dumbledore realized he couldn't possibly handle the incoming conflict on his own. He needed a general to prepare the war. His summoning ritual then dragged Commandant Shepard, Specter and N7 Alliance Marine fighting the Reapers to 12 Square Grimmault.
Crossover - Harry Potter & Mass Effect - Rated: T - English - Adventure/Hurt/Comfort - Chapters: 6 - Words: 10,620 - Reviews: 12 - Favs: 16 - Follows: 25 - Updated: 8/3 - Published: 6/29 - Harry P., Ron W., Hermione G., Shepard
Beyond: A Mass Effect and Halo Story by yaknsneeze reviews
AU. 7 months after the events on the Citadel, Commander Shepard and an old ally return to fight an old enemy. Their new mission however, just got a lot more complicated. Post Mass Effect 3, and set in the Halo universe during the book Shadows of Reach.
Crossover - Halo & Mass Effect - Rated: M - English - Chapters: 4 - Words: 11,739 - Reviews: 8 - Favs: 21 - Follows: 34 - Updated: 8/3 - Published: 6/27 - Master Chief/John-117, Shepard
No place like home by Sicht
They promised, 'The Future is with us' and, I wondered who 'us' really was. The average Ivan and Natasha were nowhere in sight for whatever plans the leaders of the Union had in mind. Still, I don't think it was all smoke and mirrors. Might need to see for myself, just to make sure.
Crossover - Mass Effect & Cyberpunk 2077 - Rated: M - English - Sci-Fi - Chapters: 1 - Words: 5,322 - Favs: 2 - Follows: 5 - Published: 8/2
Shadows and Dust by HistoricalHijinks reviews
Shattered, Reborn, Reforged, Remade. The gaze of the Pheonix Force, seeking purpose and understanding, falls upon the Reapers and their harvests. Disgusted by their perverted, farcical 'cycle', it decides to wipe their stain from the multiverse. Needing a perfect host, it waits tens of millennia until, as Hannah Shepard is miscarrying due to eezo radiation, it finds one in her womb
Crossover - X-Men & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 2 - Words: 12,440 - Reviews: 21 - Favs: 137 - Follows: 186 - Updated: 8/2 - Published: 6/25 - Ashley W., Liara T'Soni, Shepard
Stacked Deck by A Tin Can reviews
The peoples of Earth have reclaimed their legacy from the ashes of the old world. With mutants and aliens in tow as it's citizens alongside the rest of humanity, they're bound to make waves. The rest of the galaxy is about to see what happens when the right people know how to stack a deck in their favor.
Crossover - Fallout & Mass Effect - Rated: M - English - Adventure - Chapters: 1 - Words: 4,660 - Reviews: 4 - Favs: 43 - Follows: 79 - Published: 8/1 - Lone Wanderer, Courier, OC, Sole Survivor
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. And a shy one at that. Mostly Titanfall and Halo, with some (a lot) Deep Rock Galactic. First try at writing, so keep that in mind
Crossover - Mass Effect & Titanfall - Rated: M - English - Sci-Fi - Chapters: 3 - Words: 25,986 - Reviews: 10 - Favs: 54 - Follows: 74 - Updated: 8/1 - Published: 6/10
Were it So Easy by Sigma0327 reviews
Six's life was a giant war. Every battle was a test of sheer tenacity and stubbornness against insurmountable odds. Every moment, every bullet fired, every Covenant, Insurrectionist, and Flood spore killed has led up to his last fight. Once again he was one of the few that stood between Earth and her enemies. This would be his final battle, and nothing could change that, right?
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 10 - Words: 143,827 - Reviews: 200 - Favs: 900 - Follows: 1,301 - Updated: 7/31 - Published: 11/9/2020 - SPARTAN-B312/Noble Six, Tali'Zorah, Miranda L., Shepard
Hunter x Hunter x Mass Effect challenge by kameriderking
A Chimera Ant’s AU Challenge
Crossover - Hunter X Hunter & Mass Effect - Rated: T - English - Sci-Fi/Supernatural - Chapters: 1 - Words: 64 - Favs: 1 - Follows: 1 - Published: 7/30
The Unknown Defender by Gabenator5 reviews
A new faction stirs, its green-clad enforcers seemingly unstoppable. Rumors spread, pirate bases go dark, and both the enslaved and kidnapped are discovered free. Who are these new interlopers, and what is their goal? For good or ill, the powers that be intend to find out. REWORK COMPLETED.
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 19 - Words: 153,359 - Reviews: 1461 - Favs: 3,995 - Follows: 5,020 - Updated: 7/30 - Published: 9/27/2016 - Master Chief/John-117, Cortana, Tali'Zorah, Leviathan
Folded Effects by Mr. Thicc Montagne reviews
This is a very WIP, and very AU story. Space Engineers lacks lore, but instead I'll be utilizing lore from my own Space Engineers group. Gaia Cracking Industries will be the sole SE faction represented. And there will be 1 ship brought over. The Yggdrasil. A carrier ship. The SE ships will not simply overpower the ME ones. Summary to be updated once there's a proper story here.
Crossover - Mass Effect & Space Engineers - Rated: M - English - Sci-Fi/Adventure - Chapters: 2 - Words: 3,777 - Reviews: 15 - Favs: 29 - Follows: 39 - Updated: 7/29 - Published: 7/25 - Shepard, OC
Not in one's own plate by Sicht reviews
Time has become an elusive concept, leaving V uncertain if she has been trapped for a year or even longer. Amidst lingering anxiety and worries, she clings to the belief that her sacrifices were not in vain, desperately seeking a glimmer of hope for a meaningful outcome to her plight. Since hope dies last.
Crossover - Mass Effect & Cyberpunk 2077 - Rated: M - English - Adventure/Sci-Fi - Chapters: 10 - Words: 49,291 - Reviews: 15 - Favs: 73 - Follows: 130 - Updated: 7/27 - Published: 9/8/2022 - V, OC
The Long, Long Walk by This Is Sarcasm reviews
Having stopped the Hive incursion on Eden Prime at the expense of being stuck in Commander Shepard's reality, Crow is offered a place on the Normandy. With nowhere to go, he accepts, and finds himself at the front of the fight against the Collectors, while at the same time trying to learn how to trust the ship's residents. In the end, though... maybe he's not 'stuck' after all.
Crossover - Mass Effect & Destiny - Rated: T - English - Sci-Fi/Angst - Chapters: 30 - Words: 102,768 - Reviews: 216 - Favs: 370 - Follows: 519 - Updated: 7/26 - Published: 9/15/2021 - Joker, Shepard, Dr. Chakwas, Crow
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: T - English - Sci-Fi/Adventure - Chapters: 8 - Words: 28,835 - Reviews: 162 - Favs: 649 - Follows: 994 - Updated: 7/24 - Published: 12/26/2021 - OC, Tali'Zorah, Admiral Hackett, Rael'Zorah
Angelus Sanguis Humani by Ronin2106 reviews
Sanguinius manages to overcome Horus and with his final breath, he saves his sons and the Imperium, yet his soul is not taken by Dark Gods. Instead, he is reborn in a universe, where Humanity is only making it's first steps into the Galaxy, and is fighting the First Contact War. Imperium and Emperor are gone, but Humanity is here, and the Great Angel will never abandon it.
Crossover - Warhammer & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 13 - Words: 129,498 - Reviews: 788 - Favs: 1,175 - Follows: 1,506 - Updated: 7/23 - Published: 6/10 - Primarch/s, D. Anderson, Admiral Hackett
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 13 up
Crossover - Buffy: The Vampire Slayer & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 13 - Words: 22,853 - Reviews: 140 - Favs: 519 - Follows: 705 - Updated: 7/23 - Published: 10/16/2019 - Xander H., Buffy S., Willow R.
Saga of the Bridgers-Year 6 by Ganel750 reviews
A new Menace. As the war between the Coalition and the Empire enters a standstill, entire colonies at the edge of Wild Space start disappearing. When a new enemy will prove to be a threat to both sides in the conflict, enemies will have to join forces to prevent this new menace from conquering the galaxy.
Crossover - Star Wars & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 36 - Words: 204,840 - Reviews: 12 - Favs: 29 - Follows: 24 - Updated: 7/22 - Published: 8/17/2022 - Thrawn, OC, Ezra B., Shepard - Complete
Sith Effect Episode I: First Contact by Metagray reviews
The ruins of Mars belonged not to the protheans but to humanity's ancestors, the Sith Empire. How will the Citadel react to a race that not only doesn't use mass effect technology, but is an anathema to their ideals. When the turians find the Sith, they face a war unlike any this galaxy has seen. The First Contact War has begun. Peace is a lie, there is only passion.
Crossover - Star Wars & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 17 - Words: 140,024 - Reviews: 666 - Favs: 1,654 - Follows: 2,087 - Updated: 7/21 - Published: 12/3/2022 - D. Anderson, Admiral Hackett, Rael'Zorah, OC - Complete
Atonement by RJM3994 reviews
After finally dying, he expected to find peace. But he must atone for the mistakes of his life in this new universe. Revan in Mass Effect and HK-47 too for chaos.
Crossover - Star Wars & Mass Effect - Rated: M - English - Sci-Fi/Romance - Chapters: 5 - Words: 10,062 - Reviews: 11 - Favs: 32 - Follows: 41 - Updated: 7/19 - Published: 7/15 - [Revan, J. Garson] HK-47
Here There Be Monsters by J-Litt-Press
What was supposed to be a training run for the crew of the USS Spirit of Fire turns into a fight for survival. An ancient evil has returned to wipe out all life in the galaxy, and the galaxy has descended into chaos and war. This brave ship and crew will travel to the darkest parts of space, fight impossible odds and face terror unimaginable to save the galaxy.
Crossover - Star Wars & Mass Effect - Rated: M - English - Horror/Adventure - Chapters: 1 - Words: 2,407 - Favs: 4 - Follows: 5 - Updated: 7/18 - Published: 6/21
Amphibia Effect: Dawn of the Reapers by Gunslinger245 reviews
Anne thought her war was over. She can finally return home safely with the Core defeated and Amphibia safe. Boy, how wrong could she have been? Now she and her friends are thrust into an alternate universe, facing a threat much worse than the Core. What if instead of sending them home, the Calamity box sends the trio to the Mass Effect universe and forces them to fight the Reapers?
Crossover - Mass Effect & Amphibia - Rated: T - English - Adventure/Sci-Fi - Chapters: 1 - Words: 10,013 - Reviews: 3 - Favs: 7 - Follows: 5 - Published: 7/18 - Shepard, Anne, Sasha, Marcy
Eddie Among the Stars by Primordial-wielder
(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: 1 - Words: 6,152 - Favs: 2 - Follows: 3 - Published: 7/17 - [Eddie H., Brittany B.] SAM, Lloyd N.
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