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The Sword of the Geth by Doctor poo and the TURDIS reviews
Dying on Mantle's Approach, Cortana wakes up in an unfamiliar environment. In her drive to get home, she 'employs' the assistance of the local synthetics. She never wanted to be a galactic overlord. But a UNSC AI in an environment woefully unprepared for one of her caliber makes an easy one.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Humor - Chapters: 3 - Words: 9,613 - Reviews: 37 - Favs: 140 - Follows: 207 - Updated: 6h - Published: 11/23 - Cortana, Shepard
Operation ECLIPSE by HelenTheMoon
Pre-ME1 post-Frontiers Xover, in which the Sonic version of Earth replaces ME Earth. A Batarian planet suddenly turns invisible, and things only get weirder from there. That poor STG agent won't know what hit him, that's for sure. And neither will the rest of the galaxy - once Sonic and Eggman get there. Crossposted on Spacebattles and AO3. Rating may change.
Crossover - Sonic the Hedgehog & Mass Effect - Rated: T - English - Sci-Fi/Fantasy - Chapters: 1 - Words: 2,411 - Favs: 2 - Follows: 3 - Published: 7h - Sonic, OC
Displaced Destiny by TheCandyManCant reviews
Rigel faced extinction every day of his life, fighting an unending tide of enemies to safeguard his people. When the time came for one last sacrifice, he didn't hesitate. But Destiny had other plans for him... I do not own any established properties and receive no monetary compensation for this fanfic.
Crossover - Mass Effect & Destiny - Rated: M - English - Chapters: 9 - Words: 28,624 - Reviews: 21 - Favs: 54 - Follows: 77 - Updated: 9h - Published: 11/19
The Return of Hope by Masso 2010 reviews
Commander Shepard is dead. Knowing that they needed someone to complete his work fighting against the Reapers, The Illusive Man set his sights on the next best thing, Humanities greatest hero. The only problem is that Superman gave up on hero work a long time ago but can the threat of galactic extinction be enough for him to once again step into the light.
Crossover - Superman & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 33 - Words: 268,048 - Reviews: 331 - Favs: 736 - Follows: 833 - Updated: 15h - Published: 7/10/2020 - Clark K./Kal-El/Superman, Miranda L.
To Trails End(Adept) by This Is Sarcasm reviews
Things go differently-and more disastrously-for Crow when he's faced with a less forgiving Young Wolf after the hunt for the High Celebrant. Devastated by the truth, he follows a terrible dream through The Howling, and emerges in a reality where there are no Guardians... and an army of Hive threatening to pour through. What's a lone Hunter to do, aside from the obvious? OVERHAULED!
Crossover - Mass Effect & Destiny - Rated: T - English - Sci-Fi/Angst - Chapters: 7 - Words: 26,133 - Reviews: 2 - Favs: 17 - Follows: 24 - Updated: 11/25 - Published: 11/7 - Garrus V., Thane K., Shepard, Crow - Complete
Drift Effect by Demon Eyes Laharl reviews
In the early 21st Century, Humanity made First Contact. By the end of it, they lost Earth. However, they survived, carving their place in the sea of stars, hoping one day to finally retake back their home world. The void, though, is a dangerous place. Another alien artifact was found near one of their border worlds, which would lead to another conflict.
Crossover - Mass Effect & Misc. Movies - Rated: M - English - Chapters: 9 - Words: 73,582 - Reviews: 49 - Favs: 163 - Follows: 243 - Updated: 11/25 - Published: 8/13
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: 82 - Words: 324,149 - Reviews: 821 - Favs: 819 - Follows: 1,089 - Updated: 11/24 - Published: 5/5/2019 - Legion, Pyrrha N., Penny P., God of Darkness
Mythos Effect by Omniscent1 reviews
A crossover between Mass Effect and Cthulhutech. Humanity has won the Aeon War and has since expanded and thrived. How will the galaxy fare with this new power?
Crossover - Cthulhu Mythos & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 27 - Words: 221,878 - Reviews: 1869 - Favs: 4,999 - Follows: 5,772 - Updated: 11/23 - Published: 6/5/2013 - Saren A., Shepard, OC
Red Sands by dzha4225 reviews
This is an highly experimental story that have been constructed using GPT-4. The chapters may be short. Instructions are included for recreation. They are meant to test the capability of large language models. This particular story invokes an scenario where Element Zero is encountered without the technology starting pack intentionally left behind at the same location.
Crossover - Mass Effect & Stellaris - Rated: T - English - Parody/Sci-Fi - Chapters: 19 - Words: 11,804 - Reviews: 15 - Favs: 8 - Follows: 11 - Updated: 11/22 - Published: 11/21
Galactic Conflicts: Tales of First Contact by TheDoctor1998 reviews
Humanity and its allies have stood strong after the Great War with the Covenant. Follow the Systems Alliance as it goes through a first contact nearly as disastrous as the one that lead to the Great War.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 5 - Words: 21,418 - Reviews: 74 - Favs: 200 - Follows: 292 - Updated: 11/22 - Published: 2/6
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: 5 - Words: 49,163 - Reviews: 20 - Favs: 38 - Follows: 53 - Updated: 11/22 - Published: 10/26 - [Shepard, OC] Shigure, Fubuki
Asymmetry: A Tragedy in Ten Acts by Pseudomonus reviews
Almost 200 years after the Reapers' destruction, Commander Benezia Shepard is given a top secret mission: To explore a strange new universe; to seek out new threats and new enemies; to boldly go where no Asari has gone before! And, at the height of the Dominion war, with the Federation facing defeat, Captain Forest encounters an impossible ship that may hold the key to victory.
Crossover - StarTrek: Deep Space Nine & Mass Effect - Rated: M - English - Sci-Fi/Drama - Chapters: 4 - Words: 28,480 - Reviews: 8 - Favs: 15 - Follows: 19 - Updated: 11/21 - Published: 11/7
Mortal Desperations by Solthrin reviews
Arcturus Magnus, Sagittarum of the Legio Custodes, has fought for years within the webway and the Impossible City. Upon taking a near-fatal wound, the Emperor Himself removes Arcturus from the front, sending him instead to bring forth reinforcements from the Mechanicum. When something goes wrong during the return, where does this Custodian find himself?
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 7 - Words: 48,184 - Reviews: 91 - Favs: 427 - Follows: 627 - Updated: 11/20 - Published: 1/17 - Adeptus Mechanicus, Tali'Zorah, Shepard
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: 45 - Words: 211,162 - Reviews: 324 - Favs: 1,005 - Follows: 1,127 - Updated: 11/20 - Published: 10/31/2022 - Shepard, V
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: 9 - Words: 29,534 - Reviews: 13 - Favs: 59 - Follows: 76 - Updated: 11/20 - Published: 1/3 - 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: 43 - Words: 144,359 - Reviews: 57 - Favs: 272 - Follows: 293 - Updated: 11/20 - Published: 8/2/2019
New Era II by martinantab reviews
The war has ended and UNSC/UEG can finally start with rebuilding. Former Covenant races created new alliance to prevent another big war. Everybody thought that they can live peacefully, but few years later UNSC Gargantua has discovered mysterious object in the Orion's arm and no one is sure, if everything will be the same again.
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Humor - Chapters: 4 - Words: 25,951 - Reviews: 25 - Favs: 112 - Follows: 166 - Updated: 11/19 - Published: 10/28 - Master Chief/John-117, T. Lasky, Councilor Tevos, Councilor Valern
Mass Effect: Fear the Old Blood by thelordofdarkreunion reviews
Shepard died, choking in the darkness of space. But yet she awoke, finding herself within a strange Hunter's Dream. Meeting the mysterious Good Hunter and Plain Doll, there are many lessons to be learned from both her home galaxy and a strange world of luminous moons and terrible beasts. Yet through them both, one rule remains constant: Fear the Old Blood.
Crossover - Mass Effect & Bloodborne - Rated: T - English - Adventure/Supernatural - Chapters: 5 - Words: 30,783 - Reviews: 66 - Favs: 168 - Follows: 234 - Updated: 11/18 - Published: 10/12 - Shepard, The Hunter, Plain Doll
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: 8 - Words: 198,822 - Reviews: 103 - Favs: 259 - Follows: 312 - Updated: 11/18 - Published: 6/6 - Garrus V., Tali'Zorah, Shepard
Mass Effect: Book of Korra by CommanderSheperddddd reviews
The world the knew is gone. Their mere existence contradicts all logic. But for Korra and the Krew rest isn't a luxury they cna afford, as even when placed in an unknown world, there is still need for heroes.
Crossover - Mass Effect & Legend of Korra - Rated: M - English - Sci-Fi/Horror - Chapters: 1 - Words: 1,345 - Reviews: 1 - Favs: 1 - Follows: 1 - Published: 11/18 - Shepard, Korra, Mako, Bolin
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: 10 - Words: 59,235 - Reviews: 123 - Favs: 230 - Follows: 354 - Updated: 11/18 - Published: 8/7
Commissar Shepard by Sabethetan reviews
You always heard of stories when Shepard is paragon and alien-friendly. But what if he got ACTUAL REASONS to hate aliens and was forced to work with them? Can he put away his hatred to stop Reapers?
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 1 - Words: 2,449 - Reviews: 13 - Favs: 20 - Follows: 25 - Published: 11/17
A Whole New World by Spartan III Commando reviews
Noble six's story did not end on Reach, he escaped the doomed planet after saving the Pillar of Autumn, and he and 117 fought across each Halo, until an incident sent him to a whole new world. And he is wholly unprepared for the journey in store.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 12 - Words: 50,142 - Reviews: 71 - Favs: 373 - Follows: 531 - Updated: 11/16 - Published: 7/7/2016 - SPARTAN-B312/Noble Six
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: 16 - Words: 89,924 - Reviews: 741 - Favs: 1,970 - Follows: 2,347 - Updated: 11/15 - Published: 8/9/2017 - Son Gohan, Son Goku, Vegeta
Mass Effect: Reaper T8 by ArcherEdgeBond reviews
A Reaper threat and three different Sheppards. how will the universe handle this. follow Geoff, John, and Jane Shepard as they fight the reapers for survival and fight a new threat soon to take hold.(this was a challenge given to me by my friend the unforgivenone19901. if you have not checked out his work please do) (Disclaimer: I do not own the rights, this is purely fanmade)
Crossover - Terminator & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 12 - Words: 31,737 - Reviews: 1 - Favs: 13 - Follows: 11 - Updated: 11/14 - Published: 2/25/2020
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