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Dying Star by Lighting wolf knight
The galaxy swallows Starfleet... And dumps them in a new land with new allies and enemies. Rated T for violence, death, and profanity.
Crossover - Mass Effect & Star Trek: Lower Decks - Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 808 - Published: 11m - Admiral Hackett, Shepard
Quintessence Effect Collective Rebirth by EvaShinobiKaiserKnight reviews
Two Years have passed since the Paladins and the Normandy had suffered the tragedy of loss. A year since the Altean's have begun to return to the galaxy after the second battle of the Citadel. But the Reapers are not done as the Paladins and a revived John Shepard must gather allies to face this threat. This is their Rebirth into a new world of wonders as Heroes. NOW FORM VOLTRON!
Crossover - Mass Effect & Voltron: Legendary Defender - Rated: M - English - Sci-Fi/Family - Chapters: 4 - Words: 44,139 - Reviews: 19 - Favs: 23 - Follows: 26 - Updated: 18h - Published: 8/11 - [OC, Princess Allura]
Pandora Effect by Depressing Rat reviews
In wake of the RDA'S defeat at the hands of the Resistance, Pandora has soon entered a state of unity with the aid of Human Resistance and Avatars by introducing Sky people technology to the Na'vi tribes, this alliance soon forming the Pandoran Alliance.
Crossover - Mass Effect & Avatar - Rated: T - English - Sci-Fi/Fantasy - Chapters: 2 - Words: 4,012 - Reviews: 7 - Favs: 11 - Follows: 19 - Updated: 9/5 - Published: 7/11
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: 6 - Words: 31,766 - Reviews: 66 - Favs: 327 - Follows: 450 - Updated: 9/5 - Published: 6/25/2023 - Ashley W., Liara T'Soni, Shepard
The N7 and Avatar by EclipsePheniox reviews
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: 8 - Words: 21,128 - Reviews: 1 - Favs: 11 - Follows: 22 - Updated: 9/5 - Published: 3/19 - Miranda L., Shepard, Korra, Asami S.
Pillars of Virtue by Son of Caliban reviews
Though divided, the Human Sphere is strong, and few among it stronger than the O-12 Council's own Commander Jonathan Shepard, the Lion of Paradiso. As a potential candidate for the Citadel's Spectre unit, Shepard must first prove his ability by solving the death of one of the Citadel's top agents, uncovering a shadowy conspiracy which will change the galaxy forever...
Crossover - Mass Effect & Infinity: A Skirmish Game - Rated: T - English - Sci-Fi/Mystery - Chapters: 2 - Words: 15,903 - Reviews: 3 - Favs: 7 - Follows: 7 - Updated: 9/4 - Published: 8/25 - [Shepard, Kasumi G.] Kaidan A., D. Anderson
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: 22 - Words: 116,096 - Reviews: 132 - Favs: 211 - Follows: 265 - Updated: 9/4 - Published: 4/26 - Liara T'Soni, Tali'Zorah, Miranda L., Shepard
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: 6 - Words: 40,797 - Reviews: 14 - Favs: 40 - Follows: 49 - Updated: 9/4 - Published: 8/4 - Admiral Hackett, Shepard, OC, Fubuki
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: 16 - Words: 116,853 - Reviews: 96 - Favs: 288 - Follows: 405 - Updated: 9/4 - Published: 8/13/2023
XCOM Terran Empire by emperorcaligula05 reviews
Sometime after the fall of the Elders at the hands of XCOM, a new government had formed from the combined efforts of the Reapers and the Templars, one that wished to see aliens not just exterminated from the face of the Earth but the eminent domain of human space. Will the might of the Citadel triumph over this new player or will the empires be swept forevermore into the dust bin?
Crossover - X-Com & Mass Effect - Rated: T - English - Sci-Fi/Angst - Chapters: 3 - Words: 11,502 - Reviews: 19 - Favs: 43 - Follows: 62 - Updated: 9/3 - Published: 8/1 - Liara T'Soni, Councilor Valern, Councilor Tevos, Councilor Sparatus
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: 19 - Words: 68,733 - Reviews: 30 - Favs: 50 - Follows: 61 - Updated: 9/3 - Published: 9/16/2023
Blue Flames by n7kairos reviews
Shepard ends up on Middle Earth after being caught up in the Crucible explosion. Follow her now as she slowly but surely becomes embroiled in a new war.
Crossover - Mass Effect & Lord of the Rings - Rated: M - English - Fantasy/Sci-Fi - Chapters: 10 - Words: 21,681 - Reviews: 24 - Favs: 56 - Follows: 85 - Updated: 9/3 - Published: 12/6/2019 - J. Garson, Gandalf
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: 5 - Words: 6,206 - Reviews: 23 - Favs: 37 - Follows: 45 - Updated: 9/3 - Published: 6/15
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: 3 - Words: 14,328 - Reviews: 9 - Favs: 46 - Follows: 58 - Updated: 9/2 - Published: 8/24 - Timothy D./Red Robin, 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: 14 - Words: 147,748 - Reviews: 583 - Favs: 1,591 - Follows: 2,113 - Updated: 9/1 - Published: 2/11/2023 - Cortana, Councilor Valern, Councilor Tevos, Councilor Sparatus
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) NOW WITH A TV TROPES PAGE!
Crossover - Sonic the Hedgehog & Mass Effect - Rated: T - English - Chapters: 29 - Words: 28,350 - Reviews: 45 - Favs: 32 - Follows: 25 - Updated: 9/1 - Published: 12/25/2023
Enduring the Flames of War by Masterdude21 reviews
A joint Asari-Turian operation salvaged a "package" from a derelict wreckage in the Terminus Systems, whereupon they release a force of war beyond their reckoning. Hoping to avoid another war, Commander Shepard recruits the "package" into her team. A simple act of kindness, unwittingly paving the way for a clash unlike the galaxy has ever seen. Fate directs the flames of war.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Horror - Chapters: 51 - Words: 766,431 - Reviews: 2626 - Favs: 4,113 - Follows: 4,940 - Updated: 8/31 - Published: 11/30/2015 - Master Chief/John-117, OC, Shepard
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: 47 - Words: 975,839 - Reviews: 893 - Favs: 576 - Follows: 651 - Updated: 8/30 - Published: 4/22/2016 - Master Chief/John-117, Cortana, Tali'Zorah, Shepard
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: 36 - Words: 131,834 - Reviews: 282 - Favs: 420 - Follows: 583 - Updated: 8/30 - Published: 9/15/2021 - Joker, Shepard, Dr. Chakwas, Crow
Book One: Harvest by Believer218 reviews
The year is 2583. Humanity stands strong, even twenty-six years after a disastrous first contact. But it seems that wherever they go, war will follow. And this war will grip the galaxy like no other. The first adventure of Mass Effect: The Reclaimer Saga. Rated M for graphic depictions of violence.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 7 - Words: 35,522 - Reviews: 96 - Favs: 94 - Follows: 145 - Updated: 8/30 - Published: 4/4 - [Master Chief/John-117, Ashley W.] Arbiter, Saren A.
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: 21 - Words: 125,471 - Reviews: 245 - Favs: 401 - Follows: 567 - Updated: 8/30 - Published: 8/7/2023
Eezo and Chrome by detonik reviews
On the brink of self destruction, humanity finds an escape forward. With the opening of Mass Relays from Earth, the galaxy faces a new era. The future unfolds as its cyber-enhanced sense of madness is introduced to the Citadel Space. This new chapter in the galaxy's history is written by the seductive power of corporations, ruthless mercenaries and unseen hands of fixers.
Crossover - Mass Effect & Cyberpunk 2077 - Rated: M - English - Chapters: 1 - Words: 3,568 - Reviews: 4 - Favs: 25 - Follows: 45 - Published: 8/29
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: 21 - Words: 46,246 - Reviews: 43 - Favs: 77 - Follows: 95 - Updated: 8/29 - Published: 1/30
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: 10 - Words: 53,766 - Reviews: 31 - Favs: 22 - Follows: 39 - Updated: 8/28 - Published: 7/7 - Garrus V., Shepard, Osiris, Cayde-6
Way Down Inside of Me 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: 3 - Words: 6,470 - Reviews: 3 - Favs: 11 - Follows: 21 - Published: 8/27 - [Lone Wanderer, Tali'Zorah]
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