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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: 6 - Words: 20,835 - Favs: 3 - Follows: 4 - Updated: 3h - Published: 3/3 - 4th Doctor, Sarah Jane S., Garrus V., Tali'Zorah
The Second Contact war by Mythicspider629 reviews
After the battle for the citadel and jane Shepard's death the galaxy has finally begun to calm down and besides a handful of people everyone has forgotten about the Reapers or chooses to ignore them this makes things easy for the citadel council and with the majority of the Normandy crew scattered throw out the galaxy there is no one left to stop the Batarians from being stupid
Crossover - Call of Duty & Mass Effect - Rated: T - English - Chapters: 3 - Words: 5,765 - Reviews: 2 - Favs: 11 - Follows: 15 - Updated: 18h - Published: 3/28 - N. Reyes, E3N/Ethan, Garrus V., Shepard
Mass Effect: Knights of the Force - Book 1: Rise of the Force by WK-94 reviews
As Reaper's cycle of extinction continues for eons, the Galaxy was in greater danger than anyone ever realized! The Force itself was threatened by countless cycles of extinction, and it reacted by bringing the Chosen One from different universe, who has great knowledge of Star Wars & Mass Effect. Will the he be able to save the Galaxy from the Reapers before it is all too late?
Crossover - Star Wars & Mass Effect - Rated: K+ - English - Sci-Fi/Parody - Chapters: 3 - Words: 12,022 - Reviews: 12 - Favs: 37 - Follows: 46 - Updated: 3/28 - Published: 3/24 - Darth Revan, Shepard, OC
World On Fire by WiseTomato reviews
The day the Reapers invaded Earth, one landed on Hogwarts. The castle survived, but the Statute of Secrecy won't.
Crossover - Harry Potter & Mass Effect - Rated: M - English - Fantasy/Adventure - Chapters: 3 - Words: 29,459 - Reviews: 194 - Favs: 1,032 - Follows: 1,412 - Updated: 3/28 - Published: 2/6/2018 - Harry P.
Mass Wars Episode II by Fantasymaker76 reviews
Five Years have past since the destruction of the Normandy and the death of Commander Shepard. Now a new order is rising in the unmapped regions of the galaxy which is leaving unease in both the Republic and the Citadel. Determined to find out what is going on, a pro-human organisation has made plans to find out what this mysterious group wants.
Crossover - Mass Effect & Star Wars - Rated: M - English - Sci-Fi/Adventure - Chapters: 8 - Words: 39,012 - Reviews: 16 - Favs: 36 - Follows: 39 - Updated: 3/28 - Published: 3/13/2023
As The Wind Abates by DingusMacGoo reviews
An immortal Harry Potter's journey into the future. More details to come.
Crossover - Harry Potter & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 23 - Words: 60,877 - Reviews: 173 - Favs: 524 - Follows: 777 - Updated: 3/27 - Published: 2/6 - Harry P., J. Garson, Shepard
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: 27 - Words: 408,031 - Reviews: 504 - Favs: 734 - Follows: 865 - Updated: 3/26 - Published: 12/28/2020 - OC, U. Wrex, Shepard, Councilor Tevos
The Big Stick by Digital-Chaos-85 reviews
The old girl's been around for almost 240 years. She served humanity for 39 of those and spent 160 as a museum, but now her fate lies in the scrap yards. Now, more than ever, the USS Iowa needs a new home under the stars. Come hell or highwater she'll get one.
Crossover - Mass Effect & Kantai Collection - Rated: T - English - Humor/Sci-Fi - Chapters: 1 - Words: 4,782 - Reviews: 5 - Favs: 15 - Follows: 24 - Published: 3/25 - OC, Iowa
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: 58 - Words: 264,146 - Reviews: 442 - Favs: 1,175 - Follows: 1,304 - Updated: 3/25 - Published: 10/31/2022 - Shepard, V
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
Crossover - Ben 10 & Mass Effect - Rated: T - English - Sci-Fi/Romance - Chapters: 13 - Words: 37,295 - Reviews: 26 - Favs: 37 - Follows: 41 - Updated: 3/25 - 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: 78 - Words: 342,104 - Reviews: 333 - Favs: 418 - Follows: 542 - Updated: 3/24 - Published: 8/7/2022
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: 20 - Words: 69,693 - Reviews: 148 - Favs: 519 - Follows: 777 - Updated: 3/24 - Published: 7/8/2022 - Rookie, Shepard
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: 3 - Words: 13,110 - Reviews: 18 - Favs: 50 - Follows: 68 - Updated: 3/23 - Published: 3/11 - Garrus V., Liara T'Soni, Admiral Hackett, C. Pressley
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: 21 - Words: 202,788 - Reviews: 97 - Favs: 100 - Follows: 148 - Updated: 3/23 - Published: 10/26/2023 - Shepard, Shigure, OC, Fubuki
The N7 and Avatar by EclipsePheniox
Commander Shepard and Avatar Korra have switched places. No one knows how or why, but one thing is for sure it's not good. Both the crew of the Normandy and Team Avatar must team up to solve the problem they both face. Korrasami, Shep/ Miranda. Teen, for now, possibly M later.
Crossover - Mass Effect & Legend of Korra - Rated: T - English - Sci-Fi/Fantasy - Chapters: 2 - Words: 5,467 - Favs: 3 - Follows: 5 - Updated: 3/22 - Published: 3/19 - Miranda L., Shepard, Korra, Asami S.
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: 7 - Words: 9,286 - Reviews: 6 - Favs: 14 - Follows: 10 - Updated: 3/21 - Published: 12/25/2023
Mass Effect: Forward Unto Dawn by WildcatWarrior67 reviews
Spartans never die. They're just missing in action. At least, that's how the saying goes. But for the Master Chief and Cortana, they're no longer missing. Awaking in a different universe, the two of them will uphold their oath: to protect Earth and all her colonies. Only it won't be from the Covenant this time.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 5 - Words: 10,714 - Reviews: 46 - Favs: 216 - Follows: 384 - Updated: 3/20 - Published: 11/26/2022 - Master Chief/John-117, Cortana, Shepard
Mass Effect: Resurrection by RabidRabbids reviews
Shepard's life hadn't gotten any easier. Entire colonies were disappearing, millions of people gone. And that's not even mentioning she'd been dead for two years, but desperate times call for desperate measures, and Shepard is forced to work with Cerberus to find out what's behind the disappearances. Thankfully, she's got monsters backing her up. (Sequel to Monstrum Immortalem)
Crossover - Mass Effect & Guardians of the Galaxy - Rated: M - English - Sci-Fi/Adventure - Chapters: 29 - Words: 135,072 - Reviews: 8 - Favs: 21 - Follows: 26 - Updated: 3/20 - Published: 6/15/2021
Judgement Effect by The Dullahan of Lore reviews
Having been cast into the ME-verse; Xander was 'saved' by a rogue scientist who took advantage of subconscious memories for the creation of A.I. Xander was transformed. he became...Skynet. YAHF!Xander. Rated M just in case at this point.
Crossover - Buffy: The Vampire Slayer & Mass Effect - Rated: M - English - Sci-Fi/Drama - Chapters: 6 - Words: 18,995 - Reviews: 33 - Favs: 125 - Follows: 176 - Updated: 3/20 - Published: 12/20/2023 - Xander H., Benezia
The Prelude to War by Indigard reviews
A very different Mass Effect galaxy encounters a strange and relentless invader that is in constant hunger for Biomass but they never know it's just a glimpse of what is coming for them. Featuring: an alternative history for every species, a bigger and more populated galaxy, cunning Asari, and a militarized and Germanized human empire.
Crossover - Warhammer & Mass Effect - Rated: T - English - Chapters: 11 - Words: 194,731 - Reviews: 53 - Favs: 105 - Follows: 119 - Updated: 3/20 - Published: 11/6/2021 - Imperial Guard, Tyranids, OC, Shepard
Mario Effect by OroDeus reviews
Haunted by visions of impending doom, Mario summons his ragtag team of explorers to adventure. Their journey across the stars will uncover the koopa king's horrible plot to take over the galaxy.
Crossover - Mario & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 6 - Words: 7,280 - Reviews: 1 - Favs: 2 - Follows: 5 - Updated: 3/19 - Published: 12/27/2023 - Mario, Luigi, Daisy, Toad
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: 12 - Words: 165,032 - Reviews: 232 - Favs: 1,033 - Follows: 1,468 - Updated: 3/17 - Published: 11/9/2020 - SPARTAN-B312/Noble Six, Tali'Zorah, Miranda L., Shepard
Spirit Unto Dawn by free man writer reviews
Spartan's found only to be lost. A ship filled with humans in a galaxy not their own. The Spirit of Fire finds itself with new allies in a galaxy they are unfamiliar with, dealing with its own set of problems and apocalyptic enemies. Co-created and written with BulletStormX. UNDERGOING REWRITE AND REVAMP
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 15 - Words: 120,849 - Reviews: 784 - Favs: 1,795 - Follows: 2,269 - Updated: 3/16 - Published: 4/16/2020 - Master Chief/John-117, SPARTAN-B312/Noble Six, Tali'Zorah, Shepard
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: 19 - Words: 110,858 - Reviews: 853 - Favs: 2,136 - Follows: 2,561 - Updated: 3/15 - Published: 8/9/2017 - Son Gohan, Son Goku, Vegeta
Anthem Effect by DragonKnight374 reviews
What if more than the world of Coda was isolated in space time? What will the freelancers do when they realize there’s more to the universe than their little planet, and how will the citadel react, to the Anthem of Creation?
Crossover - Mass Effect & Anthem - Rated: M - English - Sci-Fi/Adventure - Chapters: 15 - Words: 76,702 - Reviews: 74 - Favs: 318 - Follows: 381 - Updated: 3/14 - Published: 8/8/2022
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