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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 - Care Bears & Mass Effect - Rated: M - English - Sci-Fi/Horror - Chapters: 12 - Words: 41,162 - Reviews: 21 - Favs: 20 - Follows: 22 - Updated: 13h - Published: 9/16
The Exiles:A New Power by Johnnieboy11 reviews
The beginning of the Battle For Earth signaled the start of the final, bloodiest campaign of the Human-Covenant War. Hastily, a plan is put into motion and an Ark Fleet, composed of a dozen Phoenix-class vessels and their escorts, makes the jump out of system. Either interference, or malfunction, causes their arrival to a new Galaxy, where new threats lurk just around the corner.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 12 - Words: 46,335 - Reviews: 219 - Favs: 723 - Follows: 1,092 - Updated: 19h - Published: 12/26/2021 - OC, Tali'Zorah, Admiral Hackett, Rael'Zorah
Stellar Effect by Brandon Storm reviews
The Reapers trap was perfect in its design. Their execution refined over billions of years, their technology refined since the dawn of time itself. Right up until Someone Broke the Trap!
Crossover - Mass Effect & Stellaris - Rated: T - English - Adventure/Sci-Fi - Chapters: 62 - Words: 272,873 - Reviews: 245 - Favs: 368 - Follows: 485 - Updated: 19h - Published: 8/7/2022
Ark effect Remake by EclipsePheniox reviews
After the attack on the Collector base failed, the Normandy SR-2 found themselves on Ark a planet roaming with primordial beasts. But as their Commander returns, things become more complex as they learn about Ark and the reason they are there and the purpose of the world.
Crossover - Mass Effect & ARK: Survival Evolved - Rated: T - English - Adventure/Sci-Fi - Chapters: 7 - Words: 27,042 - Reviews: 11 - Favs: 57 - Follows: 68 - Updated: 10/7 - Published: 1/3 - Liara T'Soni, Miranda L., Shepard
Final Destination by The Abyssal Writer reviews
Dr. Datenshi had seen it all. He was there when Admiral Perry ended Japan's Isolationism, he was there when Emperor Meiji turned Japan into a World Power, he was there during the Greatest Generation of Demon Slayers. He was there when Humanity looked to the stars, and joined a galactic community. Dr. Datenshi had seen it all… But Fate, it seemed, wasn't done with him yet.
Crossover - Mass Effect & Kimetsu no Yaiba/鬼滅の刃 - Rated: T - English - Adventure/Sci-Fi - Chapters: 1 - Words: 5,336 - Reviews: 1 - Favs: 11 - Follows: 16 - Published: 10/6 - Liara T'Soni, Tali'Zorah, Shepard, OC
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: 1 - Words: 5,676 - Reviews: 1 - Favs: 11 - Follows: 17 - Published: 10/6 - Master Chief/John-117, Shepard
The Eternal Lord 40k - ME by HellFox83 reviews
A battle against the forces of Chaos strands a Necron lord in the galaxy of Mass Effect. With what's left of his dynasty under his banner, Veronakh Lord of Solvatakh intends to lead his people to glorious conquest. Can Commander Shepard stop the Collectors and curtail the ambitions of the Necrons?
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 28 - Words: 338,716 - Reviews: 109 - Favs: 382 - Follows: 517 - Updated: 10/6 - Published: 6/13/2020 - Necrons, Shepard
Saga of the Bridger-Year 7 by Ganel750 reviews
The war between the Empire and the Coalition is about to enter its bloodiest phase as 2227 will go down as the 'year of battles'. Meanwhile the Jedi Order keeps fighting a parallel war against the Sith and the Imperial Federation is entangled with an emerging power in the Milky Way.
Crossover - Star Wars & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 10 - Words: 68,353 - Reviews: 8 - Favs: 16 - Follows: 13 - Updated: 10/6 - Published: 7/28 - Admiral Ackbar, OC, Ezra B., Shepard
A Whole New World by Spartan III Commando reviews
Noble six's story did not end on Reach, he escaped the doomed planet after saving the Pillar of Autumn, and he and 117 fought across each Halo, until an incident sent him to a whole new world. And he is wholly unprepared for the journey in store.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 11 - Words: 43,836 - Reviews: 66 - Favs: 350 - Follows: 498 - Updated: 10/6 - Published: 7/7/2016 - SPARTAN-B312/Noble Six
New era by martinantab reviews
Human-Covenant war ends and and UEG started with rebuilding. Former covenant races, after Elite-Brute Coalition sucess, entered the coalition and few years later humans too and new aliance was born. They thought, they will live in peace with no wars and/or limited conflicts, this was destroyed after discovery of suspect object not far away from Tassili, new harvest colony
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Humor - Chapters: 1 - Words: 1,876 - Reviews: 3 - Favs: 10 - Follows: 14 - Published: 10/6 - T. Hood, Master Chief/John-117, Councilor Sparatus, Councilor Tevos
The Return of Hope by Masso 2010 reviews
Commander Shepard is dead. Knowing that they needed someone to complete his work fighting against the Reapers, The Illusive Man set his sights on the next best thing, Humanities greatest hero. The only problem is that Superman gave up on hero work a long time ago but can the threat of galactic extinction be enough for him to once again step into the light.
Crossover - Superman & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 31 - Words: 252,220 - Reviews: 325 - Favs: 714 - Follows: 813 - Updated: 10/5 - Published: 7/10/2020 - Clark K./Kal-El/Superman, Miranda L.
Greetings from the Soviet Union by Autoiko reviews
After uniting the Earth under the Hammer and Sickle, the Soviet Union ventured into the cosmos. Equality, prosperity, and peace have finally been promised to humanity after centuries of struggle. However, communism faces new challenges, especially extraterrestrials. To succeed, humanity must establish camaraderie with the galaxy. At what cost? Let's find out.
Crossover - Call of Duty & Mass Effect - Rated: T - English - Sci-Fi/Friendship - Chapters: 1 - Words: 1,322 - Reviews: 1 - Favs: 13 - Follows: 15 - Published: 10/3 - OC, Councilor Valern, Councilor Tevos, Councilor Sparatus
The Eternal Cycle by Imperatix reviews
The Eternal Empire has carved a place in the galaxy through unity, duty, and faith. These tenants have allowed humanity to rule the stars, however it is uncertain times in the galaxy, with the Emperor's faithful being across the galaxy, it's only a matter of time before there is conflict. One such conflict has occurred on a planet known as Shanxi.
Crossover - Star Wars & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 1 - Words: 3,139 - Reviews: 3 - Favs: 12 - Follows: 15 - Published: 10/3
Mandalorian Effect by BulletstormX reviews
The Mandalorian and The Normandy crew attempt a daring rescue to save one of there own. One-Shot is co-written/created with FreeManWriter and Jebest4781
Crossover - Mass Effect & Mandalorian - Rated: M - English - Sci-Fi/Fantasy - Chapters: 1 - Words: 12,852 - Reviews: 7 - Favs: 11 - Follows: 10 - Published: 10/2 - Garrus V., Shepard, The Mandalorian/Din Djarin, The Child/baby yoda - Complete
Never Fade Away by Ideas-Guy reviews
Lives are cheap and money is everything. That's how the orphanage made its money - lending out children for human expirementation. L is an old man at the age of fifteen and he knows he doesn't have much time left. All that mattered was getting out, but he soon learns that the world is a lot bigger than Night City. And that the galaxy is a lot bigger than Earth.
Crossover - Mass Effect & Cyberpunk 2077 - Rated: M - English - Adventure/Drama - Chapters: 39 - Words: 185,345 - Reviews: 292 - Favs: 920 - Follows: 1,029 - Updated: 10/2 - Published: 10/31/2022 - Shepard, V
War of the Old Ones by Ian the Mechanic reviews
In forgotten ages past, two near eldritch forces vied for the very life essence of the Galaxy. Unknown to the young races, that war is still ongoing. how can the UNSC, the Citadel Council or the Covenant hope to stand against such forces, when they are still embroiled in their own petty squabbling? How could they hope to survive the War of the Old Ones?
Crossover - Mass Effect & Halo - Rated: M - English - Sci-Fi/Horror - Chapters: 24 - Words: 129,715 - Reviews: 142 - Favs: 288 - Follows: 432 - Updated: 10/2 - Published: 2/21/2022
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: 7 - Words: 41,049 - Reviews: 87 - Favs: 182 - Follows: 290 - Updated: 10/1 - Published: 8/7
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: 60 - Words: 218,791 - Reviews: 620 - Favs: 865 - Follows: 923 - Updated: 10/1 - Published: 4/14/2015
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: 5 - Words: 44,312 - Reviews: 24 - Favs: 102 - Follows: 152 - Updated: 10/1 - Published: 8/13
Bellum Terranum by F35B reviews
In the year 2585 the Humans have mostly recovered from the effects of the Human-Covenant War, however unknown to them, there is a much larger Galaxy out there... one that doesn't take kindly to humanity and their... antics... However an old threat still lays out there, ready to strike. Pls Read & Review (Slight HFY)(AU)
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 6 - Words: 29,252 - Reviews: 165 - Favs: 306 - Follows: 469 - Updated: 9/30 - Published: 7/31
Temporal Displacement with Gamer Characteristics by Keywielder reviews
As if shifting between the real world and Elite-verse when I had just graduated from Senior High for a few months wasn't enough, now they're telling me that it was a goddamned Beta THE WHOLE TIME, after FIVE FUCKING YEARS of God knows what in the actual fuck and ONLY NOW I get the full release! Fuck it. Let's just roll with this crap... Gamer, OC, SI. Current World: Mass Effect.
Crossover - Mass Effect & Elite Dangerous - Rated: M - English - Sci-Fi - Chapters: 6 - Words: 66,638 - Reviews: 61 - Favs: 294 - Follows: 379 - Updated: 9/30 - Published: 11/20/2021
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: 3 - Words: 15,458 - Reviews: 44 - Favs: 144 - Follows: 196 - Updated: 9/30 - Published: 2/6
Kage of the Stars V2 by Warlock99 reviews
Saving people is hard as is being a hero, but saving the universe? Well, that's going to take an army that transcends and breaks the laws of the universe. And a Kage to lead them to victory. This is the story of that Kage; this is the story of Naruto Uzumaki the Kage who rules the stars and all the universe.
Crossover - Naruto & Mass Effect - Rated: M - English - Adventure - Chapters: 5 - Words: 12,219 - Reviews: 3 - Favs: 31 - Follows: 39 - Published: 9/30 - Naruto U., Sara Ryder
Those Who Favor Fire by The.A.I.1502 reviews
In a universe reeling from the Blip, Isabelle Collins is shattered by her brother's death. But humanity's intent on colonizing the stars reveals an undeniable truth - Thanos was the harbinger of something much worse. Isabelle must peel back the layers of her new reality, because this time, the stakes are much higher than half of all life.
Crossover - Marvel & Mass Effect - Rated: M - English - Sci-Fi/Fantasy - Chapters: 32 - Words: 327,572 - Reviews: 22 - Favs: 60 - Follows: 73 - Updated: 9/29 - Published: 6/1/2020 - OC, P. Coulson, Harbinger, Shepard
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: 6 - Words: 38,353 - Reviews: 80 - Favs: 379 - Follows: 571 - Updated: 9/29 - Published: 1/17 - Adeptus Mechanicus, Tali'Zorah, Shepard
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