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To Infinity by
creamofwheat2311 reviews
After discovering an ancient artifact, the UNSC's most advanced warship and a Sangheili Assault Carrier are transported to a universe unlike anything they have ever seen, and forced into a war against a foe they never could have imagined.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 46 - Words: 390,407 - Reviews: 3553 - Favs: 4,073 - Follows: 4,888 - Updated: 7/25 - Published: 10/9/2013 - Master Chief/John-117, Arbiter, T. Lasky, 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: 1072 - Favs: 3,020 - Follows: 3,421 - Updated: 4/6 - Published: 6/5/2013 - Shepard (M)
From the Ashes by
erttheking reviews
Even after seeing their world burned, Humanity was able to stand up again, and push beyond their pre-war status and reach the heavens. But how will a hardened Humanity handle life among the stars? And how will others react to this aggressive newcomer?
Crossover - Fallout & Mass Effect - Rated: T - English - Sci-Fi/Romance - Chapters: 118 - Words: 913,475 - Reviews: 3479 - Favs: 2,661 - Follows: 2,507 - Updated: 2/24 - Published: 5/17/2012
Halo: New Horizons by
creamofwheat2311 reviews
In 2559, and the UNSC has discovered a large anomaly on the edge of the galactic rim. What it turns out to be has the potential to change history, but maybe not in the way the UNSC intended. Meanwhile, with the first Death Star destroyed, the Rebel Alliance is desperately trying to overthrow the Empire, but it will take the help of new allies to liberate the galaxy. Discontinued.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 23 - Words: 155,262 - Reviews: 942 - Favs: 1,069 - Follows: 1,106 - Updated: 9/30/2016 - Published: 11/1/2012 - Luke S., G. Marek/Starkiller, T. Lasky - Complete
Mass Effect: Clash of Civilizations by
Eterna1Soldier reviews
In 2157 a Citadel Council exploratory vessel is tasked with opening a dormant Relay into unknown regions of the galaxy. What they find is something they never expected. What happens when two civilizations centered around different technologies clash?
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Mystery - Chapters: 21 - Words: 96,812 - Reviews: 3394 - Favs: 5,052 - Follows: 5,933 - Updated: 5/22/2016 - Published: 10/13/2011 - Tali'Zorah
Guilty Sparks by
General Rage reviews
Fleeing from the glassing of Reach in the belly of the Pillar of the Autumn, the crew of the SR-2 Normandy find themselves stranded with their UNSC allies on a strange Forerunner constructed ring world called Halo with the Covenant hunting them. But Halo holds a secret, one deadlier than both the Covenant and Reapers combined... and it's hungry.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Horror - Chapters: 38 - Words: 890,061 - Reviews: 1022 - Favs: 642 - Follows: 565 - Updated: 1/28/2015 - Published: 11/5/2012 - Master Chief/John-117, Shepard (M) - Complete
Enemy Returned by
Palladius reviews
The Ethereal assault on Earth was foiled by Colonel Jane Shepard. The Temple Ship taken intact, XCOM gained the capability to strike back against the Ethereals. However, Humans weren't the only species the Ethereals had set their sights on. For they were determined to make this cycle different.
Crossover - X-Com & Mass Effect - Rated: M - English - Sci-Fi/Family - Chapters: 38 - Words: 161,748 - Reviews: 1015 - Favs: 1,124 - Follows: 1,278 - Updated: 1/17/2015 - Published: 10/3/2013 - Shepard (F), U. Wrex, Tali'Zorah, Admiral Hackett
Mass Effect: Reclamation by
reptilia28 reviews
The Reapers have been harvesting the organic races of the galaxy since time immemorial, but the galaxy is a big place; even they cannot cover everything. Within the myriad cracks they left, the Forerunners and humanity arose. What will happen when the UNSC encounters the numerous other races of the galaxy, just in time to witness the Reapers' return? AU. Post-H4/pre-ME1.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 4 - Words: 39,922 - Reviews: 214 - Favs: 689 - Follows: 906 - Updated: 7/27/2014 - Published: 10/26/2013 - Shepard (M), Nihlus K.
Fifty Shades of Overkill by
TheBleachDoctor reviews
When you become an extragalactic entity, meeting other galactic civilizations becomes an inevitable occurrence, and First Contact rarely goes well for the less-advanced society. Pre-ME through ME3. Rated T for language and implied sexual situations later on. Extremely Light parody on Halo OPness AKA Halo tech taken to its logical conclusion.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 4 - Words: 34,074 - Reviews: 751 - Favs: 1,062 - Follows: 1,336 - Updated: 4/11/2014 - Published: 2/11/2013 - Shepard (F), Admiral Hackett, Tali'Zorah, EDI
The Lord of Revenge by
Primordial Soul reviews
The Light and the Dark have fought for thousands of years, each possessing their own champions. But now, both will tread in fear of one, displaced from his time, who is the Master of both Light and Dark. One who wants Revenge. DS Ending Male Revan, time travel.
Crossover - Star Wars & Star Wars - Rated: T - English - Adventure - Chapters: 11 - Words: 66,752 - Reviews: 400 - Favs: 851 - Follows: 917 - Updated: 3/27/2014 - Published: 8/2/2012 - Revan
The Space Race by
Palladius reviews
The USA and the USSR turned their long-standing animosity to the stars with the launch of Sputnik I in 1957. Two hundred years on, the superpowers and their alien allies find themselves embroiled in the machinations of entities beyond their comprehension. AU first contact.
Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 42 - Words: 125,469 - Reviews: 599 - Favs: 703 - Follows: 758 - Updated: 12/16/2013 - Published: 6/20/2013 - Shepard (F), Garrus V.