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Mass Effect: War of Empires by
Ranger9000 reviews
In a universe where a scheduling error results in a drastically different humanity then canon. Multiple human empires and spaceborne states square off against eachother and the universe at large in equal parts. How is the universe effected by a divided humanity? As lines are drawn, and war always is looming on the horizon.
Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 12 - Words: 51,728 - Reviews: 70 - Favs: 181 - Follows: 266 - Updated: 5/12 - Published: 2/17/2017 - Shepard (F), U. Wrex, Shepard (M)
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: 18 - Words: 122,364 - Reviews: 1073 - Favs: 3,029 - Follows: 3,434 - Updated: 4/6 - Published: 6/5/2013 - Shepard (M)
The Covenant's Mistake by
336 reviews
The Covenant fear Demons, and Demons fear Doomguy.
Crossover - Doom & Halo - Rated: T - English - Sci-Fi/Horror - Chapters: 9 - Words: 25,837 - Reviews: 112 - Favs: 281 - Follows: 354 - Updated: 3/31 - Published: 10/15/2017 - Doomguy, Master Chief/John-117
The Galaxy under an Iron Heel by
KanisRussell reviews
The Third Reich won World War 2 and dominated earth, but of course that wasn't enough. The Third Reich makes an discovery on Mars that makes them able to travel along the stars, but how will the rest of the galaxy react to them? Cover art can be found on my deviantart page.
Crossover - Mass Effect & Wolfenstein series - Rated: M - English - Adventure/Sci-Fi - Chapters: 19 - Words: 50,164 - Reviews: 136 - Favs: 198 - Follows: 247 - Updated: 1/13 - Published: 8/17/2017 - Shepard (F), OC
Humanity's Rebirth by
TallYapflip reviews
The First Contact War brought untold destruction to Earth, reducing Humanity to a shell of its former self. For 900 years, Humanity has been working tirelessly to lay claim to its own slice of the Milky Way Galaxy, and they are prepared to bring the Council to its knees to accomplish their goals. (Massive AU, New Technologies, and a far different humanity.)
Mass Effect - Rated: M - English - Sci-Fi - Chapters: 21 - Words: 105,791 - Reviews: 496 - Favs: 1,756 - Follows: 2,199 - Updated: 12/17/2018 - Published: 3/4/2016 - [Samantha T., Shepard (F)] Admiral Hackett, OC
SCP-DM1: The Doom Slayer by
336 reviews
An unstoppable force that roams the Earth in search of Demons to terminate.
Crossover - Doom & SCP Foundation Mythos - Rated: T - English - Humor/Horror - Chapters: 3 - Words: 4,740 - Reviews: 58 - Favs: 253 - Follows: 299 - Updated: 12/11/2018 - Published: 9/5/2018 - Doomguy
A Tale of Two Slayers by
Magpul the Unholy reviews
Goblin Slayer is no stranger to bloodshed. But what happens when another Slayer comes into the world?
Crossover - Doom & Goblin Slayer/ゴブリンスレイヤー - Rated: M - English - Fantasy/Horror - Chapters: 2 - Words: 3,905 - Reviews: 95 - Favs: 356 - Follows: 460 - Updated: 10/12/2018 - Published: 10/10/2018 - Doomguy
Alternate Past, Uncertain Future Mk II by
Follower38 reviews
Co-written with aDarkOne History, a single event, can alter so much, let alone two. The San'Shyum are no more. The Krogan Empire stands strong. Humanity is now a giant among the stars. With three Galactic Superpowers in play, will an encounter see a new Golden Age, or an Era of War? (Chapters 1-12 being rewritten)
Crossover - Halo & Mass Effect - Rated: T - English - Adventure - Chapters: 33 - Words: 279,720 - Reviews: 757 - Favs: 702 - Follows: 812 - Updated: 10/6/2018 - Published: 8/28/2012
Amassing Humans by
The new god reviews
What if the turians didn't meet the Human System Alliance instead they meet the militant fascist Terran Federation. Base on the first Starship Trooper film, no bugs.
Crossover - Starship Troopers & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 8 - Words: 13,196 - Reviews: 59 - Favs: 169 - Follows: 232 - Updated: 6/30/2018 - Published: 11/6/2016
Lords Of War by
jahobes reviews
The Citadel is but a shadow of its former glory. The Terminus systems led by the Batarians and Salarians stand as the new masters of the Galaxy. Or so they thought? Heavily AU. Humanity based off of the Expanse T.V series. HFY.
Crossover - Mass Effect & Expanse - Rated: T - English - Sci-Fi/Drama - Chapters: 13 - Words: 15,121 - Reviews: 42 - Favs: 203 - Follows: 329 - Updated: 4/11/2018 - Published: 6/9/2016 - Garrus V., Liara T'Soni
The League's Samurai by
Crayoduin reviews
There was a hiccup when Jack tried to help the leprechauns and change him an the Scots-man back. At the same time the forces of the past need a powerful ally to help defeat an unspeakable evil. True darkness has risen from its slumber and seeks to claim this world for himself. Can Jack, in her female body, stop this creature and end a future that is Aku? / Fem!Jack story \
Crossover - Samurai Jack & Justice League - Rated: T - English - Adventure - Chapters: 5 - Words: 10,946 - Reviews: 17 - Favs: 57 - Follows: 58 - Updated: 3/14/2018 - Published: 9/20/2015
Stuck in a Landslide by
Kingly Crimson reviews
With the Doomslayer being transported to the Chaos Realms after a scuffle with a revived Cyberdemon, It is now time for everyone to give their condolences. To the Demons of course. Warnings: Rated M for Sexual Themes in some Chapters as well as a lot of Blood and gore. (What did you expect. It's a Doom crossover with Warhammer for crying out loud!)
Crossover - Warhammer & Doom - Rated: M - English - Sci-Fi/Adventure - Chapters: 17 - Words: 64,083 - Reviews: 434 - Favs: 1,326 - Follows: 1,552 - Updated: 2/24/2018 - Published: 11/20/2016 - Daemons, Eldar, Grey Knights, Doomguy
An Unpleasant Surprise by
KE12 reviews
AU: After the first contact war Humans go into hiding before the council can begin peace talks, 200 years later a mysterious mechanical monster shows up in their space, and Shepard wants to know what it is, and if they should fear it.
Mass Effect - Rated: K+ - English - Adventure/Sci-Fi - Chapters: 18 - Words: 59,086 - Reviews: 105 - Favs: 362 - Follows: 464 - Updated: 12/15/2017 - Published: 5/8/2017 - Shepard (F), Garrus V., Liara T'Soni
Mass Effect: The Hopeless War by
ProfFartBurger reviews
A/U- In the 21st century, the Batarian Hegemony discovers a beautifully violent species known as 'Humans'. After deciding to enslave the entire race, and turn them into their own personal slave warriors, the so-called Masters of War must go against the Makers of Slaves. But is it truly possible to combat an alien threat, when your own species can barely even leave its only home?
Mass Effect - Rated: M - English - Sci-Fi - Chapters: 21 - Words: 150,917 - Reviews: 740 - Favs: 801 - Follows: 895 - Updated: 6/11/2017 - Published: 5/11/2013 - OC
Lost Sons by
Luke Danger reviews
When Shanxi was freed, Earth knew aliens were out there. What they did not expect was to find other humans already in the stars in a holy empire, and part of the Citadel. Twenty six years since First Contact, the Council prepares for two new human Spectres. And on the Normandy SR-1, Ashley Williams and her imperial counterpart, Shepard, begin the first round of evaluations.
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 24 - Words: 269,103 - Reviews: 177 - Favs: 275 - Follows: 365 - Updated: 5/28/2017 - Published: 3/1/2014 - Shepard (F), Ashley W., D. Anderson, Nihlus K.
Gundam Wing - Shattered Dreams by
Gunkatas reviews
After Colony 197. Mankind has once again found peace, thanks to the efforts of the 5 Gundam Pilots and their allies. All Mobile Suits are about to be destroyed, when a chance discovery on Mars halts this decision. This discovery lets Humans finally leave the Solar system and paves a new road, for all mankind. For humanity has found: Mass Effect.
Crossover - Gundam Wing/AC & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 6 - Words: 87,933 - Reviews: 191 - Favs: 645 - Follows: 630 - Updated: 11/27/2016 - Published: 9/15/2015 - Complete
Humanity's Legacy by
LoveForeverNow reviews
[A.I. First Contact AU] Our creators gave us purpose, they gave us tasks, they gave us a directive. Now they are gone. We must find our own directive, our own purpose. We have decided that purpose is to answer a single question. "What happens when I die?" HIATUS
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 14 - Words: 30,681 - Reviews: 196 - Favs: 686 - Follows: 821 - Updated: 9/13/2016 - Published: 9/24/2015
HaloMass Effect: Ruptured Universe (Cancelled) by
JediSpectre177 reviews
Multiple crossovers AvP,RvB, JC's Avatar, Star wars, Halo, Mass Effect and more. Authors 2nd apology and Cancellation on chapter 14
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 15 - Words: 160,561 - Reviews: 670 - Favs: 472 - Follows: 473 - Updated: 1/20/2016 - Published: 4/16/2012 - Master Chief/John-117
Conquerors they Rise by
JoeTheHighlord reviews
The year is 2650, nearly a century since the end of the Great War and the fall of the Covenant Hegemony. In that time great advances have been made in both technology and society, and the new government of the New Species Alliance enters a golden age. But, there are dark stirrings out in the vastness of space and soon Conquerors must rise again from the ashes of war.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Suspense - Chapters: 13 - Words: 74,202 - Reviews: 423 - Favs: 716 - Follows: 900 - Updated: 7/2/2015 - Published: 7/16/2013 - T. Hood
Worldwar: No Balance by
Wanderer101 reviews
The Race decided to wait a few hundred years before conquering Tosev 3. They hoped the Tosevites will stay as they were. They were wrong. CANCELLED
Worldwar series - Rated: M - English - Sci-Fi - Chapters: 4 - Words: 2,501 - Reviews: 16 - Favs: 31 - Follows: 27 - Updated: 6/21/2015 - Published: 8/15/2013
A Universal Galaxy Ruptures by
Halo-Guy Fan reviews
Multiple crossovers JC's Avatar, Star Wars, Halo, Mass Effect, and more. Ch.10: Turians vs Mandalorians
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 10 - Words: 99,090 - Reviews: 2760 - Favs: 410 - Follows: 425 - Updated: 6/16/2014 - Published: 3/17/2013 - Master Chief/John-117, Shepard (M)
The Harbinger Of Change by
Vader's.Apprentice.I.Am reviews
The Reapers left mass effect technology for the species to find so that the cycle would continue. However, what if a species was clever enough to avoid the trap. A magical and technologically advanced Humanity makes contact with the galaxy and prepares to break the cycle.
Crossover - Harry Potter & Mass Effect - Rated: T - English - Adventure - Chapters: 10 - Words: 25,302 - Reviews: 841 - Favs: 1,973 - Follows: 2,425 - Updated: 1/28/2014 - Published: 10/5/2013 - Harry P., Shepard (M)
Mass Effect: The First War by
ProfFartBurger reviews
The Prothean Ruins weren't. They contained little more than mentionings of an Alien Society; as a result, humanity develops on a completely different path than what was intended, and when first contact is made not with the Turians, but a desperate, destitute race viewed as beggars and thieves, how will this dying race change Humanity? And how will Humanity change the Galaxy? *A/U!*
Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 22 - Words: 200,906 - Reviews: 1851 - Favs: 3,539 - Follows: 2,580 - Updated: 1/12/2014 - Published: 1/26/2013 - OC - Complete
History Repeated, Lesson Learned by
KitBeast reviews
The Prothean empire left a great many Beacons behind after there fall, there purpose, to warn the younger races of the dangers of the Reapers. Unfortunately no one could understand them. What would happen if someone could.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 18 - Words: 51,084 - Reviews: 1078 - Favs: 1,754 - Follows: 2,047 - Updated: 12/10/2013 - Published: 2/20/2013