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The Expanse by T0mmy07 reviews
A century has passed since Earth, Mars and Laconia unified mankind under one government. For a long mankind has expanded across the ring network, but now faced with a new threat and a rapidly mutating environment the time has come for humanity to meet the greater galaxy. The fic explores mainly an initial human expansion into the relay network and the consequences of such decision
Crossover - Mass Effect & Expanse - Rated: T - English - Western/Sci-Fi - Chapters: 1 - Words: 1,628 - Reviews: 2 - Favs: 1 - Follows: 4 - Published: 10h - Councilor Tevos, Councilor Sparatus, OC
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: 2 - Words: 4,006 - Reviews: 2 - Favs: 2 - Follows: 2 - Updated: 10h - Published: 11/18/2023 - Shepard, Korra, Mako, Bolin
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: 8 - Words: 38,961 - Reviews: 112 - Favs: 117 - Follows: 173 - Updated: 14h - Published: 4/4/2024 - [Master Chief/John-117, Ashley W.] Arbiter, Saren A.
In Pursuit of Purpose by Bodacity2.0 reviews
An account of the adventures of one of the Emperor's Adeptus Custodes, and his attempts to accomplish his sole mission in a universe where that matters little. While introducing the grim darkness of the far future to Citadel Space, his journey leads him along an unexpected path.
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 1 - Words: 3,432 - Reviews: 1 - Favs: 5 - Follows: 5 - Published: 2/19 - OC, Garrus V., Ashley W., Shepard
Mario Effect by OroDeus reviews
Haunted by visions of impending doom, Mario summons his ragtag team of explorers to adventure. Their journey across the stars will uncover the koopa king's horrible plot to take over the galaxy.
Crossover - Mario & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 17 - Words: 20,708 - Reviews: 10 - Favs: 4 - Follows: 7 - Updated: 2/19 - Published: 12/27/2023 - Mario, Luigi, Daisy, Toad
Mass Foundations by Nord Ronnoc reviews
There are universes that diverge from a choice and there are universes that are fundamentally different from one another, forming a vast, limitless multiverse. In these set of universes, there are orbs that manipulate and alter any reality, rip apart the boundaries between them. If left unchecked, they will bring an end of everything. Welcome to the multiverse. Enjoy your stay.
Crossover - Mass Effect & Game X-overs - Rated: M - English - Sci-Fi/Adventure - Chapters: 25 - Words: 103,977 - Reviews: 37 - Favs: 124 - Follows: 104 - Updated: 2/18 - Published: 12/16/2012 - Shepard
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: 14 - Words: 267,265 - Reviews: 38 - Favs: 147 - Follows: 172 - Updated: 2/18 - Published: 4/10/2023 - C. Carmine, Samantha B./Sam, Shepard, Tali'Zorah
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: 4 - Words: 31,484 - Reviews: 46 - Favs: 271 - Follows: 380 - Updated: 6/18/2024 - Published: 10/9/2023 - P. Cole, OC, Admiral Hackett, Shepard
An intriguing result by ReligiousZealot reviews
The Turians, the military arm of the Council and the galaxy's peacekeepers, initially stood alone during their encounter with the Council. However, what if they hadn't been alone? What if their first contact wasn't solely with the Council? Imagine if they had an unexpected ally—a species unlike any other: the Zerg collective
Crossover - StarCraft & Mass Effect - Rated: T - English - Mystery/Suspense - Chapters: 9 - Words: 16,852 - Reviews: 29 - Favs: 87 - Follows: 124 - Updated: 2/17 - Published: 5/14/2024
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: 30 - Words: 185,636 - Reviews: 99 - Favs: 57 - Follows: 79 - Updated: 2/17 - Published: 7/7/2024 - Garrus V., Shepard, Osiris, Cayde-6
Audax Novus by A-01 reviews
A bold new world - A strange new reality - Fresh trials, tribulations, allies, and enemies. John fell through the portal from the Mantles Approach, but his luck works in mysterious ways. Now stranded in an alternate reality, how will he strive forward? The galaxy takes a sharp turn from the world we know, and the Reaper threat looms just as large, but no longer so uncontested.
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Romance - Chapters: 26 - Words: 676,710 - Reviews: 840 - Favs: 1,936 - Follows: 2,364 - Updated: 2/16 - Published: 9/4/2020 - [Master Chief/John-117, Miranda L.] [Shepard, Tali'Zorah]
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: 39 - Words: 138,364 - Reviews: 222 - Favs: 696 - Follows: 990 - Updated: 2/15 - Published: 7/8/2022 - Rookie, Shepard
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: 17 - Words: 99,268 - Reviews: 418 - Favs: 607 - Follows: 856 - Updated: 2/15 - Published: 2/6/2023
Into the Howling Dark by long night of solace reviews
Hundreds of millions of years ago, Humanity, Forerunners and the SanShyuum, the tier-1 species protected the galaxy. But the peace never lasted as the threat of flood and the reapers brought the Milkyway to the edge of extinction. Now the warriors of the past needs to guide the future galaxy and stop history from repeating itself.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 7 - Words: 57,716 - Reviews: 63 - Favs: 180 - Follows: 241 - Updated: 1/19 - Published: 10/23/2024 - Master Chief/John-117, Didact, D. Anderson, Shepard
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: 25 - Words: 150,917 - Reviews: 992 - Favs: 2,337 - Follows: 2,782 - Updated: 2/14 - Published: 8/9/2017 - Son Gohan, Son Goku, Vegeta
Mass Effect: A Custodian's Tale by Glader96 reviews
The Adeptus Custodes. The Talons of the Emperor. The Emperor's Legion. Bar the Primarchs, the 10000 are the greatest warriors sworn to the Master of Mankind. For so long they did not concern themselves with the galaxy beyond Sol, after the Fall of Cadia they now depart the Throne World to wage war. One of their kind finds himself in a galaxy so very different from what he knows.
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 4 - Words: 9,814 - Reviews: 54 - Favs: 51 - Follows: 71 - Updated: 2/14 - Published: 1/30 - The Emperor, Garrus V., Miranda L., Shepard
First Contact with the Angels by AntrosAscended reviews
Horus rebelled against the machinations of Chaos and sacrificed himself for the Galaxy; Lorgar's Rebellion finally seems to have become a distant memory for the Imperium. On the 30th Anniversary of the Warmaster's death, a new swath of space would be found by accident, setting new possibilities or new failures in motion. I'm Antros. I'm back to remake my first story
Crossover - Warhammer & Mass Effect - Rated: T - English - Drama/Sci-Fi - Chapters: 8 - Words: 85,250 - Reviews: 192 - Favs: 447 - Follows: 602 - Updated: 2/13 - Published: 1/10/2024 - Space Marines, Primarch/s, Councilor Tevos, Councilor Sparatus
Terran Federation: Counterstrike by L4 of the WEST reviews
It's been 8 years since the end of the 2nd Bug war. Humanity is starting to enter its golden age in the galactic stage, with technology no one can replicate, with allies that no one has accepted, and a military capable of taking on any competitor it seems. But that will change, those who employ chains are circling like wolves, and an enemy thought dead return
Crossover - Starship Troopers & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 23 - Words: 168,342 - Reviews: 195 - Favs: 678 - Follows: 741 - Updated: 2/12 - Published: 2/16/2017
Across A Sea Of Stars by Unruly Marmite reviews
The year is 2823, and the dream of human unity across the Inner Sphere is dead. War, encompassing and ravenous, is the destiny of man, and the Great Houses rush to embrace it. But when a routine pirate hunting mission turns into First Contact with an alien race, that destiny might shift. For good or for ill, there may be worse things than mankind lurking among the stars.
Crossover - Mechwarrior/Battletech & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 1 - Words: 11,249 - Reviews: 5 - Favs: 22 - Follows: 31 - Published: 2/12 - Shepard, Han'Gerrel, Rael'Zorah
Let There Be Light by Phorus Aedelmaer reviews
The Imperium of Man arrives in the Mass Effect galaxy, igniting war with the Citadel Council. As the Imperium sees only heresy, the Council scrambles to survive. The Reapers, faced with an empire that defies their cycle, prepare to adapt. With war looming, the fate of the galaxy hinges on whether diplomacy or extermination prevails.
Crossover - Warhammer & Mass Effect - Rated: T - English - Sci-Fi/Fantasy - Chapters: 11 - Words: 23,225 - Reviews: 68 - Favs: 153 - Follows: 183 - Updated: 2/11 - Published: 1/29
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: 41 - Words: 226,973 - Reviews: 265 - Favs: 309 - Follows: 372 - Updated: 2/11 - Published: 4/26/2024 - Liara T'Soni, Tali'Zorah, Miranda L., Shepard
The Hero of Torfan and The Demon of Empire City by Mad Leprachaun reviews
She was an orphaned colonist turned soldier, and he was a bike courier turned messiah. Both suffered hardships. Faced down insurmountable odds, and won. Now, the weight of the galaxy rested on their shoulders. They were made strong, ruthless, all so when they face their destiny, they can make the impossible decisions, all for the common good. The galaxy depended on it.
Crossover - Mass Effect & inFAMOUS - Rated: M - English - Chapters: 13 - Words: 82,647 - Reviews: 11 - Favs: 66 - Follows: 99 - Updated: 2/10 - Published: 3/28/2023 - Shepard, Cole MacGrath
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: 29 - Words: 183,608 - Reviews: 327 - Favs: 500 - Follows: 678 - Updated: 2/10 - Published: 8/7/2023
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: 31 - Words: 469,380 - Reviews: 638 - Favs: 813 - Follows: 956 - Updated: 2/8 - Published: 12/28/2020 - OC, U. Wrex, Shepard, Councilor Tevos
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: 14 - Words: 170,464 - Reviews: 59 - Favs: 40 - Follows: 43 - Updated: 2/7 - Published: 8/11/2024 - [OC, Princess Allura] [Ashley W., Shepard]
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