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War of the Old Ones by Ian the Mechanic reviews
In forgotten ages past, two near eldritch forces vied for the very life essence of the Galaxy. Unknown to the young races, that war is still ongoing. how can the UNSC, the Citadel Council or the Covenant hope to stand against such forces, when they are still embroiled in their own petty squabbling? How could they hope to survive the War of the Old Ones?
Crossover - Mass Effect & Halo - Rated: M - English - Sci-Fi/Horror - Chapters: 26 - Words: 144,688 - Reviews: 155 - Favs: 317 - Follows: 466 - Updated: 12/4 - Published: 2/21/2022
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: 6 - Words: 24,346 - Reviews: 106 - Favs: 245 - Follows: 359 - Updated: 12/3 - Published: 2/6
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: 24 - Words: 361,759 - Reviews: 384 - Favs: 685 - Follows: 812 - Updated: 12/2 - Published: 12/28/2020 - OC, U. Wrex, Shepard, Councilor Tevos
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: 6 - Words: 37,390 - Reviews: 90 - Favs: 214 - Follows: 295 - Updated: 12/2 - Published: 10/12 - Shepard, The Hunter, Plain Doll
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: 31,449 - Reviews: 13 - Favs: 64 - Follows: 79 - Updated: 12/2 - Published: 1/3 - Liara T'Soni, Miranda L., Shepard
Exciting Opportunities by Of Questionable Veracity reviews
In an unexpected and highly unlikely turn of events, a catastrophic warp breach from a crippled ship manages to fling a Rogue Trader - or rather, the youngest son of a Rogue Trader - through time and space to a universe quite unlike what anyone on-board in used to. They make the best of the situation.
Crossover - Warhammer & Mass Effect - Rated: K+ - English - Chapters: 38 - Words: 215,668 - Reviews: 536 - Favs: 748 - Follows: 1,046 - Updated: 12/1 - Published: 4/15/2019 - J. Garson
Mass Effect: Halo Codex Version by Vulture Electra reviews
What would happen if the universes of both Halo, Mass Effect, and Avatar(James Cameroon) were combine into one universe. What would happen had Halo Humanity had an earlier first contact rather than their first contact being with the Covenant. How would things played out, find out in this fanfic called Mass Effect: Halo.
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 1 - Words: 1,200 - Reviews: 1 - Favs: 13 - Follows: 13 - Published: 12/1
Robo Effect by Star Sage reviews
The Robotech wars are over. The survivors of Humanity and the Zentraedi are now alone in the universe, and so, come together, becoming something new, becoming Terrans. Now this race will find itself thrust into the galactic scene, as the Citadel Races and those beyond test these young upstarts, and in the shadows, old things begin to move.
Crossover - Robotech/Macross & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 62 - Words: 223,576 - Reviews: 635 - Favs: 896 - Follows: 970 - Updated: 12/1 - Published: 4/14/2015
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: 23 - Words: 113,598 - Reviews: 138 - Favs: 371 - Follows: 459 - Updated: 11/30 - Published: 8/18/2020 - Amuro R., Char A., Tali'Zorah, Admiral Hackett
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: 2 - Words: 14,996 - Reviews: 25 - Favs: 140 - Follows: 205 - Updated: 11/30 - Published: 10/9 - P. Cole, OC, Admiral Hackett, Shepard
A unexpected foe by L3G10N reviews
The Turians expected a unprepared young species, what they didn't expect was for their foe to have friends in high places.
Crossover - Mass Effect & Thor - Rated: M - English - Drama - Chapters: 5 - Words: 14,533 - Reviews: 126 - Favs: 452 - Follows: 602 - Updated: 11/29 - Published: 5/18/2019 - Thor, Loki, Hela
The Eternal Lord 40k - ME by HellFox83 reviews
A battle against the forces of Chaos strands a Necron lord in the galaxy of Mass Effect. With what's left of his dynasty under his banner, Veronakh Lord of Solvatakh intends to lead his people to glorious conquest. Can Commander Shepard stop the Collectors and curtail the ambitions of the Necrons?
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 29 - Words: 344,914 - Reviews: 111 - Favs: 396 - Follows: 531 - Updated: 11/27 - Published: 6/13/2020 - Necrons, Shepard
The TF & ME X-Over Guide by BurialFaun8
This is not a story about an OC/SI character being introduced into the Mass Effect Storyline but rather a guideline or codex that I and others can freely use to potentially create new stories combining these two great franchises. Feel free to borrow material from this fic to use in your own stories. Took me 2 Days to write this so suck on that.
Crossover - Mass Effect & Titanfall - Rated: T - English - Sci-Fi - Chapters: 22 - Words: 18,971 - Favs: 5 - Follows: 4 - Published: 11/27 - Complete
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: 332 - Favs: 743 - Follows: 842 - Updated: 11/26 - 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: 27,008 - Reviews: 3 - Favs: 21 - Follows: 27 - Updated: 11/25 - Published: 11/7 - Garrus V., Thane K., Shepard, Crow - Complete
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: 823 - Favs: 826 - Follows: 1,095 - 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: 1885 - Favs: 5,049 - Follows: 5,838 - Updated: 11/23 - Published: 6/5/2013 - Saren A., Shepard, OC
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: 94 - Favs: 447 - Follows: 660 - Updated: 11/20 - Published: 1/17 - Adeptus Mechanicus, Tali'Zorah, Shepard
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: 105 - Favs: 272 - Follows: 334 - 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
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: 14 - Favs: 24 - Follows: 30 - 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: 50,151 - Reviews: 73 - Favs: 381 - Follows: 541 - 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: 744 - Favs: 1,999 - Follows: 2,384 - 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
Command effect: Rise of the three powers by aris1606 reviews
Anyone wondering what would happen after the events of the Uprising? There are a lot of possibilities. Time machines, Yuriko Omega on the loose, desolators, giga fortresses and a lot of other stuff. It's gonna be a crazy ride.
Crossover - Mass Effect & Command & Conquer - Rated: M - English - Adventure/Sci-Fi - Chapters: 33 - Words: 115,251 - Reviews: 79 - Favs: 162 - Follows: 239 - Updated: 11/13 - Published: 10/16/2019 - Shepard
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