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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: 6 - Words: 8,182 - Reviews: 25 - Favs: 40 - Follows: 48 - Updated: 3h - Published: 6/15
Petroleum Effect by PetroleumHead reviews
A dark alternative Mass Effect universe with a little bit of XCOM and a little bit of Cthulhu Mythos, along with some short-lived Care Bears. If humanity discovers that, in the right circumstances, petroleum can be used as a superior alternative to element zero, just how far will Earth's increasingly post-human, xenophobic, authoritarian government go to obtain oil?
Crossover - Mass Effect & Cthulhu Mythos - Rated: M - English - Sci-Fi/Horror - Chapters: 20 - Words: 74,983 - Reviews: 31 - Favs: 52 - Follows: 63 - Updated: 5h - Published: 9/16/2023
Fall of the Citadel (reboot) by Richard Scepton reviews
Many years have passed since our great victory. But as we rejoice in light of what the future has for us, we also equally weep, shed tears of sorrow, for the dearly departed who have fallen for this victory to be a reality. But what was our suffering to the innocent? What was our morals to the haughty? What was, our efforts, our sacrifices, to the complacent?
Crossover - Mass Effect & Kantai Collection - Rated: T - English - Sci-Fi/Adventure - Chapters: 9 - Words: 56,995 - Reviews: 19 - Favs: 43 - Follows: 57 - Updated: 10h - Published: 8/4 - Admiral Hackett, Shepard, OC, Fubuki
Mass Effect: Augment by j30052776 reviews
Jon Noonien-Singh, now Sheppard, continues the fight against Tyrants unlike any seen in this cycle. They have changed, but war never does.
Crossover - Fallout & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 4 - Words: 14,378 - Reviews: 1 - Favs: 12 - Follows: 17 - Updated: 21h - Published: 9/19
Gundam SEED: The League Crisis by Tristraim reviews
With the the Second Valentine War a distant memory, a revenant from the past, armed with technology far beyond, has come as a final obstacle to the future. GSDxME, pre-First Contact War.. Canon pairings.
Crossover - Gundam Seed & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 5 - Words: 16,734 - Reviews: 15 - Favs: 46 - Follows: 58 - Updated: 9/26 - Published: 11/12/2021 - Kira Y., Lacus C., Hannah S.
On the Nature of Daylight by Ragingceliac reviews
Tali never expected to be swept up into saving the galaxy; she never expected to meet someone like Commander Shepard, Hero of the Citadel; she never expected to be working for Cerberus. But the thing that would end up surprising her the most? The weirdo on the Normandy who carried around radioactive slag in his pocket.
Crossover - Fallout & Mass Effect - Rated: M - English - Angst/Romance - Chapters: 7 - Words: 16,878 - Reviews: 10 - Favs: 40 - Follows: 66 - Updated: 9/25 - Published: 8/27 - [Lone Wanderer, Tali'Zorah]
Bite: ME by FriTik reviews
Sometimes a quarian's pilgrimage will take them into deep space. Most return from these journeys but there are many who do not. In such cases search teams may be sent to find these lost pilgrims and take them home. But this lost pilgrim found Copper 9, and the metal nightmares that call it home.
Crossover - Mass Effect & Murder Drones - Rated: M - English - Horror/Sci-Fi - Chapters: 6 - Words: 34,687 - Reviews: 35 - Favs: 41 - Follows: 57 - Updated: 9/25 - Published: 9/8 - J
Shepard Reborn (A Blue Archive X Mass Effect Crossover Story) by Dr.HeavyWeaponsguy reviews
Commander John Shepard was a hero to a galaxy now, he must save a new world.
Crossover - Mass Effect & Blue Archive - Rated: T - English - Chapters: 3 - Words: 4,023 - Reviews: 1 - Favs: 3 - Follows: 4 - Published: 9/24 - Shepard
Mass effect: Beginning of the Heresy by islamov301 reviews
Captain John Shepard and his loyal crew stopped Saren and destroyed Sovereign, an ancient Reaper who was trying to take over the Citadel to bring his army here and destroy all intelligent life in the galaxy. Shepard knew that Sovereign's death was only the beginning of the war, but every night he wondered: "Why are the Reapers destroying life in the galaxy?"
Crossover - Warhammer & Mass Effect - Rated: T - English - Romance/Adventure - Chapters: 4 - Words: 19,232 - Reviews: 21 - Favs: 25 - Follows: 28 - Updated: 9/24 - Published: 9/8 - [Tali'Zorah, Shepard]
A dawning Era by Lighting wolf knight
What happens when a regular battle between the Republic and Separatists sends Anakin, Obi-Wan, Ahsoka, and both the 501st and 212th into a new reality? Chaos... And a new destiny. Rated T for violence, death, and profanity.
Crossover - Star Wars & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 1 - Words: 820 - Favs: 10 - Follows: 11 - Published: 9/24 - Luke S., Anakin Skywalker, OC, Vetra N.
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: 26 - Words: 125,748 - Reviews: 151 - Favs: 398 - Follows: 488 - Updated: 9/24 - Published: 8/18/2020 - Amuro R., Char A., Tali'Zorah, Admiral Hackett
Drake, Emissary by Scififan33 reviews
Tim could say with certainty that he was having a bad day. Stupid magician, stupid spells. They had a plan to deal with him, they did! That plan did not involved Tim being hit. Or waking up on an alien planet. But he could adapt. But what he really wanted was to go home. Since he couldn't, he'd help them find a way to peace with their creators, they had saved his life after all
Crossover - Batman & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 6 - Words: 27,153 - Reviews: 18 - Favs: 57 - Follows: 74 - Updated: 9/24 - Published: 8/24 - Timothy D./Red Robin, Tali'Zorah, Shepard
The Terminus Exarchate by infamouswestgate reviews
Qelet B'Norai, Batarian cartel-kin and agent of the Covenant, travels the swallowed-yet-undigested worlds of the Terminus Exarchate! Can he save the Covenant Empire from collapsing underneath its own great weight?
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 16 - Words: 45,076 - Reviews: 14 - Favs: 8 - Follows: 12 - Updated: 9/23 - Published: 9/11
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: 8 - Words: 13,221 - Reviews: 14 - Favs: 31 - Follows: 40 - Updated: 9/23 - Published: 6/29/2023 - Harry P., Ron W., Hermione G., Shepard
Echoes of the Forerunners: A Covenant Unveiled by Phorus Aedelmaer reviews
The Covenant War erupts with far-reaching consequences across two universes. As the UNSC struggles to survive, they form an unexpected alliance with the species of the Citadel Council. Creative liberties will be taken with the timelines, events, and characters of both franchises.
Crossover - Halo & Mass Effect - Rated: K+ - English - Sci-Fi - Chapters: 10 - Words: 21,486 - Reviews: 83 - Favs: 78 - Follows: 117 - Updated: 9/23 - Published: 9/8
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: 10 - Words: 46,207 - Reviews: 243 - Favs: 469 - Follows: 649 - Updated: 9/22 - Published: 2/6/2023
The Reclaimer Wars:The Reaper Crisis by Johnnieboy11 reviews
Six months prior to the worst crisis the normal Milky Way would face, Commander Shepard hunts the Collectors abducting human colonists in the Terminus Systems when she comes upon a terrifying new sight:Three Intergalactic fleets arrayed against each-other and her sole Frigate. Three new factions, one seeking a home and two seeking answers, all linked by the Star Roads.
Crossover - Game X-overs & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 26 - Words: 143,019 - Reviews: 148 - Favs: 225 - Follows: 283 - Updated: 9/21 - Published: 4/26 - Liara T'Soni, Tali'Zorah, Miranda L., Shepard
Star Mahou effect by phantompain12 reviews
Tanya finally winds up in mass effect after having dealt with Being X. Starkiller's son too ends up in mass effect after his own sacrifice to stop the empire. This is something like that. I have no idea what I am going to write. Author note: Guys, I don't know what the hell I am doing. I just decided to write and this is the result. Any help would be appreciated as Eng is 2nd lang.
Crossover - Star Wars & Mass Effect - Rated: T - English - Humor/Adventure - Chapters: 22 - Words: 48,208 - Reviews: 46 - Favs: 78 - Follows: 99 - Updated: 9/21 - Published: 1/30
One Small Step by Bardothren reviews
Izuku opens a door inside a Turian ship and it all goes downhill from there.
Crossover - Mass Effect & My Hero Academia/僕のヒーローアカデミア - Rated: K - English - Sci-Fi/Drama - Chapters: 3 - Words: 7,295 - Reviews: 24 - Favs: 60 - Follows: 85 - Updated: 9/20 - Published: 6/11 - Izuku M., Nezu/The Principal
As The Wind Abates by DingusMacGoo reviews
After witnessing the death of his oldest friend, an immortal Harry Potter turns to the stars in an attempt to find meaning in his life.
Crossover - Harry Potter & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 37 - Words: 88,622 - Reviews: 296 - Favs: 936 - Follows: 1,316 - Updated: 9/20 - 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: 29 - Words: 439,466 - Reviews: 587 - Favs: 778 - Follows: 919 - Updated: 9/20 - Published: 12/28/2020 - OC, U. Wrex, Shepard, Councilor Tevos
Stellaris Book 2: The Shadow of Cerberus by Stormhawk fan SHhype reviews
Mega Multi Crossover, Main aspects are Storm Hawks and Mass Effect, with characters from Stargate, Star Wars and more, Sequel to Stellaris Book 1: The Fledging. A year has passed since the Liberation of Atmos. Piper, Aerrow and Finn have joined Lark at the ACPA, while Shepard has returned to the UNE Navy. Meanwhile Repton has escaped execution with new allies, and a new plan.
Crossover - Storm Hawks & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 3 - Words: 29,834 - Reviews: 8 - Favs: 11 - Follows: 8 - Updated: 9/19 - Published: 5/27/2021 - Piper, Cyclonis, Illusive Man, Shepard
Operation ECLIPSE by HelenTheMoon reviews
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. NOW ON TV TROPES!
Crossover - Sonic the Hedgehog & Mass Effect - Rated: T - English - Sci-Fi/Fantasy - Chapters: 13 - Words: 139,994 - Reviews: 77 - Favs: 96 - Follows: 118 - Updated: 9/19 - Published: 11/26/2023 - Sonic, Tails, OC
Mass Effect: Become Legend by Redgrave21 reviews
More than five years after the Reaper War, Jane Shepard had lost her life for her galaxy, while Garrus Vakarian struggles to move on from the loss of the love of his life. But when Garrus begins to suffer strange dreams, the Normandy crew are thrust into a conflict that has lasted since the beginning of time. All the while a strange voice begins to tempt Garrus with… Salvation.
Crossover - Destiny & Mass Effect - Rated: M - English - Adventure/Romance - Chapters: 11 - Words: 59,611 - Reviews: 35 - Favs: 29 - Follows: 44 - Updated: 9/18 - Published: 7/7 - Garrus V., Shepard, Osiris, Cayde-6
The Boundary Effect - The Path of a Magician by xyzdreadnought reviews
Isika Valao is a young Asari child, with nothing to her name and a lot to prove. Enamoured by magic and the Alliance, she sets out to become what should Be impossible for the naturally biotic Asari, a magician. With the help of a certain ordinary Magician, she just might make that dream a reality. (A spin off Story to the Boundary Effect, written with Permission)
Crossover - Mass Effect & Touhou Project - Rated: T - English - Sci-Fi/Fantasy - Chapters: 13 - Words: 44,968 - Reviews: 52 - Favs: 217 - Follows: 289 - Updated: 9/18 - Published: 12/17/2018 - OC, Alice M., Marisa K.
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