Halo and Mass Effect Crossovers
Filters
658 | Page 1 2 3 4 11 .. Last Next »

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.
Rated: M - English - Sci-Fi/Adventure - Chapters: 22 - Words: 86,875 - Reviews: 385 - Favs: 986 - Follows: 1,429 - Updated: 1h - Published: 12/26/2021 - OC, Tali'Zorah, Admiral Hackett, Rael'Zorah
Remnants by General Rage reviews
From Halo's ashes, a mismatched Alliance is born. UNSC soldiers now serve alongside both Batarian deserters and shifty Jackal Space Pirates. Now Shepard and Master Chief have to keep these strange bedfellows from killing one another before they can stop an emergent new threat to the galaxy. The Next Swashbuckling Chapter of the Wormhole Chronicles.
Rated: M - English - Adventure/Sci-Fi - Chapters: 43 - Words: 910,922 - Reviews: 854 - Favs: 514 - Follows: 590 - Updated: 6/2 - Published: 4/22/2016 - Master Chief/John-117, Cortana, Tali'Zorah, 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)
Rated: M - English - Adventure - Chapters: 24 - Words: 88,237 - Reviews: 163 - Favs: 567 - Follows: 844 - Updated: 6/2 - Published: 7/8/2022 - Rookie, Shepard
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.
Rated: M - English - Sci-Fi/Adventure - Chapters: 5 - Words: 27,538 - Reviews: 82 - Favs: 79 - Follows: 119 - Updated: 5/28 - Published: 4/4 - [Master Chief/John-117, Ashley W.] Arbiter, Saren A.
Outlaws of the Verse (REVISED, May 2024) by Coltkit Prods. - Omniva Verse reviews
Unofficial sequel/AU/Multi-Xover to "The Last Spartan" by DinoJake. After the defeat of the Reapers, Sapient races stopped aging (believed to be caused by the wave that reprogrammed the Reapers). Made sustainable thanks to Replicators, Dyson Spheres, & Magic giving near infinite land & resources. 3 Powers battle for the soul of the Galaxies: The Space Forces, Pirates, & The Outlaws
Rated: T - English - Sci-Fi/Family - Chapters: 30 - Words: 80,974 - Reviews: 2 - Favs: 16 - Follows: 10 - Updated: 5/28 - Published: 10/21/2023 - Master Chief/John-117, Shepard, OC, U. Grunt
The Sins of our Fathers by MarkerMagnum reviews
Unknown to the Citadel Council, the Human-Covenant war nears its vicious end. Miranda Keyes is seconds too slow. Delta Halo fires, leaving UNSC space as a lifeless snapshot in time. The Citadel must morn the loss of a civilization they never knew.
Rated: T - English - Drama/Sci-Fi - Chapters: 13 - Words: 134,428 - Reviews: 548 - Favs: 1,525 - Follows: 2,027 - Updated: 5/27 - Published: 2/11/2023 - Cortana, Councilor Valern, Councilor Tevos, Councilor Sparatus
Halo: A New Journey by mgarner3199 reviews
Master Chief wakes up in the Mass Effect universe and joins Commander Shepard in an effort to stop the Reapers. With time running out, can they stop the extinction of every species, or will they fade into legend?First, they got to stop the Reapers though...
Rated: K - English - Sci-Fi/Romance - Chapters: 4 - Words: 4,078 - Reviews: 21 - Favs: 53 - Follows: 90 - Updated: 5/18 - Published: 12/7/2021 - Cortana, Master Chief/John-117, Illusive Man, Shepard
The Wreck by Gabenator5 reviews
After the destruction of the Normandy, Tali'Zorah sets out to explore the lesser-explored regions of the galaxy in search of rare materials for the Migrant Fleet. During her adventures, she stumbles upon something that shouldn't exist within her universe. The galaxy will never be the same... [Rework: COMPLETED]
Rated: T - English - Fantasy/Sci-Fi - Chapters: 8 - Words: 25,101 - Reviews: 431 - Favs: 1,348 - Follows: 1,952 - Updated: 5/11 - Published: 1/7/2018 - 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. However a chance encounter with an alien artifact and following contact with the Council leads humanity and the rest of the Milky Way into a twisting conspiracy forging unexpected alliances between each race. A show that the Reapers are all too happy to watch. (Heavy AU)
Rated: M - English - Sci-Fi/Adventure - Chapters: 5 - Words: 46,193 - Reviews: 245 - Favs: 534 - Follows: 833 - Updated: 5/7 - Published: 7/31/2023 - Master Chief/John-117, J. Keyes, Illusive Man, 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.
Rated: M - English - Sci-Fi - Chapters: 8 - Words: 37,444 - Reviews: 181 - Favs: 382 - Follows: 544 - Updated: 5/3 - Published: 2/6/2023
Voyage unto Infinity by supertruckin reviews
The USS Voyager comes face to face with the massive ship that is the UNSC Infinity after Voyager's nearly fatal first test of their quantum slipstream drive. Getting home isn't their only issue. They will have to work together in order to unravel the ancient threat that plagues the new galaxy that they find themselves in. Star Trek:Voyager, Mass Effect, and Halo triple crossover
Rated: T - English - Sci-Fi/Adventure - Chapters: 16 - Words: 92,085 - Reviews: 734 - Favs: 1,898 - Follows: 2,437 - Updated: 4/26 - Published: 4/10/2019 - Master Chief/John-117, Cortana, Shepard
Galaxy of Inheritors and Usurpers by HaloZealotDemon reviews
The Separatists destroy the Covenant in a brutal war, yet in the 2570s remnants persist, but their defeat is inevitable. However, The Gods have other plans. The Migrant fleet deciding to escape through a dormant Relay into unknown space, meet "Sleep-deprived Titans with negative zero fucks to give." -LTCOL Church. Heavy AU, RVB elements, swearing.
Rated: M - English - Sci-Fi/Drama - Chapters: 3 - Words: 28,112 - Reviews: 94 - Favs: 394 - Follows: 561 - Updated: 4/21 - Published: 12/25/2022 - Arbiter, T. Hood, Han'Gerrel, Rael'Zorah
Spirit Unto Dawn by free man writer reviews
Spartan's found only to be lost. A ship filled with humans in a galaxy not their own. The Spirit of Fire finds itself with new allies in a galaxy they are unfamiliar with, dealing with its own set of problems and apocalyptic enemies. Co-created and written with BulletStormX. UNDERGOING REWRITE AND REVAMP
Rated: M - English - Sci-Fi/Adventure - Chapters: 16 - Words: 122,216 - Reviews: 821 - Favs: 1,861 - Follows: 2,338 - Updated: 4/4 - Published: 4/16/2020 - Master Chief/John-117, SPARTAN-B312/Noble Six, Tali'Zorah, Shepard - Complete
New Mombasa The Rookie And Engineer by jabinker reviews
Rookie and Tali'Zorah, both separated from their squads and lost in the Mega-City of New Mombasa must work together to survive the Covenant forces to find clues of where their squads are and to also complete the mission, save New Mombasa.
Rated: M - English - Sci-Fi - Chapters: 1 - Words: 3,959 - Reviews: 6 - Favs: 23 - Follows: 44 - Published: 4/2 - Rookie, Tali'Zorah
Mass Effect: Forward Unto Dawn by WildcatWarrior67 reviews
Spartans never die. They're just missing in action. At least, that's how the saying goes. But for the Master Chief and Cortana, they're no longer missing. Awaking in a different universe, the two of them will uphold their oath: to protect Earth and all her colonies. Only it won't be from the Covenant this time.
Rated: T - English - Sci-Fi/Adventure - Chapters: 5 - Words: 10,714 - Reviews: 47 - Favs: 247 - Follows: 424 - Updated: 3/20 - Published: 11/26/2022 - Master Chief/John-117, Cortana, Shepard
Were it So Easy by Sigma0327 reviews
Six's life was a giant war. Every battle was a test of sheer tenacity and stubbornness against insurmountable odds. Every moment, every bullet fired, every Covenant, Insurrectionist, and Flood spore killed has led up to his last fight. Once again he was one of the few that stood between Earth and her enemies. This would be his final battle, and nothing could change that, right?
Rated: M - English - Adventure/Sci-Fi - Chapters: 12 - Words: 165,032 - Reviews: 234 - Favs: 1,062 - Follows: 1,507 - Updated: 3/17 - Published: 11/9/2020 - SPARTAN-B312/Noble Six, Tali'Zorah, Miranda L., Shepard
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.
Rated: M - English - Adventure/Romance - Chapters: 26 - Words: 656,439 - Reviews: 819 - Favs: 1,843 - Follows: 2,259 - Updated: 3/2 - Published: 9/4/2020 - [Master Chief/John-117, Miranda L.] [Shepard, Tali'Zorah]
Noble Reborn (Timeline of Events) by TheJSmooth reviews
This is a timeline of events that intertwines the universes of Halo and several other fandoms, the biggest being Mass Effect. Changes here and there have altered the final script in the Infinite Journey of the Master Chief as well as his equal Noble Six. Dare to take a peek inside...
Rated: M - English - Sci-Fi/Adventure - Chapters: 5 - Words: 14,250 - Reviews: 2 - Favs: 15 - Follows: 16 - Published: 3/2 - Complete
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)
Rated: K+ - English - Sci-Fi - Chapters: 3 - Words: 25,036 - Reviews: 36 - Favs: 213 - Follows: 309 - Updated: 3/1 - Published: 10/9/2023 - P. Cole, OC, Admiral Hackett, Shepard
Mass effect: the Jaded ones by Dozerrk reviews
A UNSC Human-covenant war-era battle group led by a Punic class supercarrier is introduced to a new galaxy. One where people are xenophilic, use to times of peace and harmony, and against disrupting the Status Quo. What will an extremely aggressive xenophobic and battle-hardened human faction add to the mix? and will their addition change the future of this galaxy. (No Spartans)
Rated: M - English - Adventure/Humor - Chapters: 6 - Words: 37,211 - Reviews: 78 - Favs: 197 - Follows: 294 - Updated: 2/29 - Published: 2/6/2022 - E. Buck, OC
The UNSC and her allies by Xenofoxwolf reviews
what happens when a multiversal entity decides to save several species from Extinction by pulling them from their original realities? what happens when those species get dropped around the UNSC before the human Covenant war during the insurrection?
Rated: M - English - Adventure - Chapters: 2 - Words: 6,081 - Reviews: 26 - Favs: 85 - Follows: 131 - Updated: 2/24 - Published: 2/18
On the Illusion of Might by evevee reviews
We thought ourselves powerful, able to conquer a galaxy with nothing but toys. When we overcame every challenge, breached the space between the galaxies themselves, what use were the words of a race ashamed of their own past? Yet we cannot deny that we were warned, for while a challenge to a human is laughable, a challenge to humanity is a death sentence.
Rated: M - English - Sci-Fi - Chapters: 28 - Words: 308,369 - Reviews: 2235 - Favs: 4,181 - Follows: 5,222 - Updated: 2/21 - Published: 2/21/2017 - Master Chief/John-117, Cortana, Garrus V., Shepard
Legacy by WisdomOfCelestials reviews
Keys, Answers, Questions, Doors. What starts, What ends? Lord of Admirals, Lord of Beggars. Time and Un-Time
Rated: T - English - Chapters: 1 - Words: 9,444 - Reviews: 16 - Favs: 86 - Follows: 105 - Published: 2/19
To Become Something More by Sha825 reviews
Humanity discovers the Mass Effect earlier, and as a result, the First-Contact war doesn't end on Shanxi. A renegade Asari matriach ferries ancient knowledge to a new and unlikely ally, kick-starting a secretive program to recruit 75 children and make them something more. A hardened, militaristic, but united humanity emerges to the galactic scene. An ancient cycle rumbles to life.
Rated: M - English - Sci-Fi/Suspense - Chapters: 1 - Words: 2,110 - Reviews: 16 - Favs: 100 - Follows: 164 - Published: 2/13 - Master Chief/John-117, C. Halsey, Cortana, D. Anderson
The Adventures of the Lucen: The VykurCorp Conspiracy by General Rage reviews
Liara T'Soni continued her mission to protect the Galaxy while Commander Shepard is in another dimension. She must stop the Covenant and the allies they've gathered from wreaking havoc in a Galaxy without it's greatest hero. While she's had some success, there's a gathering storm on the horizon and one of her crew of misfits will be forced to confront her past before it clears.
Rated: M - English - Sci-Fi/Adventure - Chapters: 17 - Words: 275,180 - Reviews: 186 - Favs: 145 - Follows: 153 - Updated: 2/11 - Published: 6/26/2016 - OC, Liara T'Soni, U. Wrex - Complete
658 | Page 1 2 3 4 11 .. Last Next »