Mass Effect Crossovers
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The Traveler's Second Chance by Caldesan reviews
The Traveler has a different response to the Darkness. A story where the Guardians never accept the Darkness. The Traveler gave them a second chance, what do they do with it? Destiny shows up in Mass Effect. OC's for Destiny MC and Ghosts, different take on Destiny Lore
Crossover - Mass Effect & Destiny - Rated: M - English - Adventure/Romance - Chapters: 7 - Words: 64,818 - Reviews: 15 - Favs: 83 - Follows: 124 - Updated: 2/6 - Published: 8/6/2023
Torch and Burn by Lighting wolf knight reviews
The Tau Empire was strained... And a new galaxy offers a new lease on life. Rated T for violence, death, and profanity.
Crossover - Warhammer & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 2 - Words: 2,829 - Reviews: 2 - Favs: 13 - Follows: 15 - Updated: 2/6 - Published: 12/10/2023 - Tau, Subcommander Torchstar, Admiral Hackett
Frontlines: the Attican Front by vmoneywashere reviews
For over half a decade, the Citadel is losing a war against the race simply nicknamed the Friskies (Lankies). Their worlds slowly being lost, armies even numbers in the hundreds of thousands wiped off the map, and millions dead. But hope can be found. A signal detected off in the Attician Traverse. A recon force ventures out: To find a duel between Humanity and the Lankies.
Crossover - Misc. Books & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 4 - Words: 20,943 - Reviews: 26 - Favs: 130 - Follows: 196 - Updated: 2/5 - Published: 9/4/2023
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: 23 - Words: 123,604 - Reviews: 568 - Favs: 1,130 - Follows: 1,599 - Updated: 2/4 - Published: 11/23/2023 - Cortana, Shepard
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: 17 - Words: 59,187 - Reviews: 140 - Favs: 496 - Follows: 739 - Updated: 2/3 - Published: 7/8/2022 - Rookie, Shepard
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: 64 - Words: 228,012 - Reviews: 640 - Favs: 920 - Follows: 1,000 - Updated: 2/2 - Published: 4/14/2015
Operation ECLIPSE - Apocrypha and Sidestories by HelenTheMoon
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: 6 - Words: 8,161 - Favs: 12 - Follows: 8 - Updated: 1/31 - Published: 12/25/2023
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.
Crossover - Sonic the Hedgehog & Mass Effect - Rated: T - English - Sci-Fi/Fantasy - Chapters: 5 - Words: 51,951 - Reviews: 11 - Favs: 51 - Follows: 69 - Updated: 1/31 - Published: 11/26/2023 - Sonic, Tails, OC
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: 12 - Words: 74,722 - Reviews: 143 - Favs: 279 - Follows: 410 - Updated: 1/30 - Published: 8/7/2023
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: 9 - Words: 59,959 - Reviews: 118 - Favs: 530 - Follows: 774 - Updated: 1/28 - Published: 1/17/2023 - Adeptus Mechanicus, Tali'Zorah, Shepard
Boundaries Displaced by Hirowolfgang reviews
When a dormant Mass Effect is activated by Battarian pirates, it is affected by a mysterious phenomenon that displaces the Dreikruz en route to their final confrontation with the Quaestors. Now stranded Mitsuba and the Dreikruz have to put differences aside in order to work together with the Normandy SR-2 against the Collectors and the following Reaper war. For better or worse.
Crossover - Mass Effect & Super Robot Wars - Rated: M - English - Sci-Fi/Drama - Chapters: 9 - Words: 45,811 - Reviews: 17 - Favs: 37 - Follows: 57 - Updated: 1/28 - Published: 2/28/2023 - Garrus V., Shepard
Stellar Effect Codex by Brandon Storm reviews
A Codex exploring the History and Lore of the Stellar Effect Universe
Crossover - Mass Effect & Stellaris - Rated: T - English - Sci-Fi - Chapters: 17 - Words: 35,864 - Reviews: 28 - Favs: 44 - Follows: 45 - Updated: 1/28 - Published: 8/7/2022
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: 44 - Words: 150,440 - Reviews: 61 - Favs: 284 - Follows: 302 - Updated: 1/28 - Published: 8/2/2019
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, the Federation facing defeat, Captain Forest encounters an unlikely ship that may hold the key to victory. Complete.
Crossover - StarTrek: Deep Space Nine & Mass Effect - Rated: M - English - Sci-Fi/Drama - Chapters: 12 - Words: 100,118 - Reviews: 21 - Favs: 29 - Follows: 39 - Updated: 1/28 - Published: 11/7/2023 - Complete
Imperial Warlord: Rewrite by deeed22 reviews
Two friends once cast adrift in a universe not their own find themselves in another. With their goals unknown, purpose not directed or forced, are they finally free to choose their own way?
Crossover - Warhammer & Mass Effect - Rated: M - English - Adventure - Chapters: 5 - Words: 19,885 - Reviews: 47 - Favs: 183 - Follows: 265 - Updated: 1/28 - Published: 8/30/2021 - Imperial Guard, OC, Adeptus Mechanicus
Feared Reverence by ayab reviews
376 years after the battle between heaven and earth. Two humans have achieved godhood. Using their power to guide humanity to the stars. How will the galaxy react to see a species so advanced yet so primitive? So powerful yet not wanting to use their power. They are what the citadel race aspires to be and hates because of their jealousy.
Crossover - Naruto & Mass Effect - Rated: T - English - Fantasy/Sci-Fi - Chapters: 27 - Words: 104,362 - Reviews: 194 - Favs: 331 - Follows: 445 - Updated: 1/26 - Published: 1/14/2023
Stellaris: Deja Vu by AdriannairdA reviews
When the Technocracy loses a science ship while exploring a nearby galaxy identical to the Milky Way, what first is a simple search and destroy mission becomes something much more complicated when it turns out, there are humans and other aliens there too. This'll be interesting... WARNING: Contains Plot Deviation and Shitty Dialogue
Crossover - Mass Effect & Stellaris - Rated: M - English - Sci-Fi/Adventure - Chapters: 2 - Words: 6,576 - Reviews: 7 - Favs: 22 - Follows: 33 - Updated: 1/26 - Published: 1/10 - OC
Cursed by Hookshot25 reviews
Clayton Carmine has only known hate and carnage for so many years. But once he survives the war he hoped to die in, things get strange. When people need help he isn’t one to shy away, and while helping Baird he gets sent to a place in dire need of a man like him. A man that can’t be claimed by death as easily as his kin.
Crossover - Gears of War & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 9 - Words: 133,327 - Reviews: 20 - Favs: 77 - Follows: 107 - Updated: 1/26 - Published: 4/10/2023 - C. Carmine, Samantha B./Sam, Shepard, Tali'Zorah
Bellum Terranum by F35B reviews
Humanity has long since recovered from the effects of the Human-Covenant War, beginning to resettle and rebuild. The Quarians, with help from the Council, have also begun to rebuild their fallen civilization, settling pre-approved Council planets finally settling after surviving the Morning Wars. However, one of these planets has already been taken by an unaware humanity.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 2 - Words: 15,221 - Reviews: 171 - Favs: 408 - Follows: 636 - Updated: 1/25 - Published: 7/31/2023
The mark of the federation of independent species by migos501 reviews
(TESTING PHASE)“A single event can shape our lives or change the course of history.” United under a single banner, the federation stands as a testament that any species can thrive in harmony, gifted with technology that can tip the scale of an entire galaxy, they now face with a entirely new government and it’s sets of challenges(focusing on the mass effect story)
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 2 - Words: 37,074 - Reviews: 33 - Favs: 76 - Follows: 91 - Updated: 1/24 - Published: 10/6/2023 - Master Chief/John-117, Shepard
The Effect of a Horse and a Dragon by Vimesenthusiast reviews
A different decision right after being cursed leads to a very different Ranma showing up in Nerima. When he goes after Herb to beat some sense into him Ryoga takes the chance to get rid of his rival once and for all, sending both combatants to the Mass Effect universe. What changes will two martial artists and their use of ki have on the coming conflict? RanmaXTaliXKasumiXSama
Crossover - Ranma & Mass Effect - Rated: M - English - Humor/Adventure - Chapters: 8 - Words: 160,443 - Reviews: 603 - Favs: 2,245 - Follows: 2,322 - Updated: 1/23 - Published: 2/2/2014 - Ranma, Kasumi G., Tali'Zorah, Samara
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: 4 - Words: 10,581 - Reviews: 20 - Favs: 96 - Follows: 134 - Updated: 1/20 - Published: 12/20/2023 - Xander H., Benezia
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: 7 - Words: 33,945 - Reviews: 14 - Favs: 34 - Follows: 37 - Updated: 1/20 - Published: 3/13/2023
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: 4 - Words: 9,821 - Reviews: 13 - Favs: 40 - Follows: 55 - Updated: 1/19 - Published: 11/12/2021 - Kira Y., Lacus C., Hannah S.
Percy Jackson, The Original N7 by GearTrail reviews
Commander Kate Shepard, commanding officer of the Normandy, was resurrected by Cerberus after the Normandy SR 1 was destroyed in a surprise attack by the Collectors. But even with her new mission, she couldn't forget her own, one that was passed down to her as a legacy of one of the greatest heroes Earth had, the long lost demigod Percy Jackson.
Crossover - Percy Jackson and the Olympians & Mass Effect - Rated: M - English - Fantasy/Sci-Fi - Chapters: 2 - Words: 10,447 - Reviews: 1 - Favs: 32 - Follows: 52 - Updated: 1/19 - Published: 1/5
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