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

The Reclamation has already begun by Fade Maybe reviews
The Citadel Council and the Systems Alliance fight for survival against the Reaper onslaught. However, the UNSC, politically divided and still recovering from the Didact's assault discovers a Mass Relay that will force them into the fight and change the course of galactic history forever. The Reclamation has already begun, and we are hopeless to stop it. ME3/post Halo 4
Rated: T - English - Adventure/Sci-Fi - Chapters: 43 - Words: 394,378 - Reviews: 1279 - Favs: 1,337 - Follows: 1,705 - Updated: 5/30 - Published: 3/13/2013
The Wreck by Gabenator5 reviews
After the Normandy's destruction, Tali'Zorah goes out to traverse the lesser explored places in the galaxy in search of rare materials for the Migrant Fleet. While on her adventures she finds something that shouldn't belong... she finds a Wreck... The Galaxy will never be the same.
Rated: T - English - Fantasy/Sci-Fi - Chapters: 6 - Words: 11,367 - Reviews: 199 - Favs: 589 - Follows: 950 - Updated: 5/25 - Published: 1/7/2018 - Tali'Zorah
Codex of the Multiverse by hunter 139 reviews
This is a document that details the history and composition of the factions in the multiverse. Multicrossover between several different franchises.
Rated: T - English - Sci-Fi - Chapters: 7 - Words: 17,201 - Reviews: 14 - Favs: 20 - Follows: 13 - Updated: 5/23 - Published: 2/17/2015
Folks Need Heroes by Bodacity2.0 reviews
A nuke, a slipspace portal, and a human digitizer - the perfect ingredients for the unexpected. Fortunately for Shepard and Co., a little unexpected, or in this case, a BIG unexpected, is just what this galaxy needs. Get ready to finish the fight, laser up, and give some people back their bombs.
Rated: T - English - Adventure/Sci-Fi - Chapters: 11 - Words: 61,652 - Reviews: 129 - Favs: 330 - Follows: 502 - Updated: 5/23 - Published: 4/28 - Master Chief/John-117, Miranda L., Shepard
Spectre by blackshamrock333 reviews
L'équilibre galactique est sur le point d'être rompu, suite à l'attaque d'une colonie humaine par ce qui semble être des laquais de la citadelle. Toutefois, pour certains hauts gradés, il y a anguille sous roche. Une lourde tâche repose donc à présent sur l'équipage du prowler de l'UNSC Normandy: découvrir la vérité et empêcher une guerre fatalement dévastatrice.
Rated: T - French - Adventure/Sci-Fi - Chapters: 8 - Words: 19,034 - Reviews: 2 - Favs: 4 - Follows: 4 - Updated: 5/23 - Published: 7/25/2019 - Shepard
Spectre (english version) by blackshamrock333 reviews
Galaxy's peace is at stake, following the attack of Eden Prime by Citadel's lackey. However, for a handfull of high-ranking UNSC officer, something is off and it's now the job the Normandy crew to find the truth.
Rated: T - English - Sci-Fi - Chapters: 4 - Words: 7,524 - Reviews: 4 - Favs: 6 - Follows: 14 - Updated: 5/22 - Published: 5/4
Once a Rookie, Always a Rookie by Twisted Fate MK 2 reviews
(Credit to Adrasos on Archive and his story, Prepare to Drop, for the idea.) On the way down to New Mombasa, Rookie falls into the Slipspace Rupture and ends up crashing down on Menae, high above Palaven, while Shepard tries to find and rescue the new Primarch. From there, the war itself will shift and the fighting persists, but who knows what an ODST will add to the mix.
Rated: T - English - Adventure - Chapters: 46 - Words: 232,088 - Reviews: 364 - Favs: 712 - Follows: 1,017 - Updated: 5/20 - Published: 9/27/2018 - Rookie, Shepard, Javik
Catalog of War by hunter 139 reviews
A collection of one shots about events, including battles, conflicts and skrimishes, that occur in the shared multiverse of my stories. I do not own any of the franchises that appear in this series. Multicrossover.
Rated: T - English - Sci-Fi - Chapters: 21 - Words: 40,304 - Reviews: 17 - Favs: 26 - Follows: 18 - Updated: 5/16 - Published: 4/21/2015
The Howling Dark by smart grid reviews
Two years have passed since the dark day that humanity's best was extinguished. Now it appears that the dead Shepard is not so dead, and that the enemies Jorge helped defeat, are not so defeated. Shepard is going to need humanity's best to take on the genocidal threat of the Collectors. Fortunately for her, Jorge has volunteered to help.
Rated: T - English - Sci-Fi/Adventure - Chapters: 7 - Words: 24,941 - Reviews: 140 - Favs: 497 - Follows: 678 - Updated: 5/12 - Published: 3/4/2019 - Jorge-052/Noble Five, Shepard
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.
Rated: T - English - Sci-Fi/Adventure - Chapters: 50 - Words: 434,567 - Reviews: 3807 - Favs: 4,522 - Follows: 5,366 - Updated: 5/10 - Published: 10/9/2013 - Master Chief/John-117, Arbiter, T. Lasky, Shepard
All the Stars by BlueWay reviews
When the Long Night of Solace is evaporated over Reach via the weaponized usage of a Slipspace Drive, it ferries with it in its swallowed sections the Covenant Empire and, more horrifyingly, the desperate measures that the UNSC used to fight them. When they are found in a universe on the precipice of their own history, the meaning of the term "Mass Effect" will change forever.
Rated: T - English - Sci-Fi/Adventure - Chapters: 25 - Words: 441,010 - Reviews: 588 - Favs: 928 - Follows: 1,208 - Updated: 5/1 - Published: 6/8/2018 - SPARTAN-B312/Noble Six, Rookie
Glitters in the Dark by The Flippant Writer reviews
The galaxy is an expansive and mysterious frontier, waiting to be claimed by those bold enough to reach for it. One must be careful not to reach further than they can handle.
Rated: T - English - Sci-Fi - Chapters: 3 - Words: 14,078 - Reviews: 37 - Favs: 116 - Follows: 198 - Updated: 4/27 - Published: 10/17/2019
In the name of Earth and Balaho, till the bitter end! by dutchsoldier reviews
The Reapers say they do not know fear and never experience it, but how long will this remain the truth when Humanities greatest heroes from another dimension come here with ships and allies? Will the name demon rise once more, with now entire armada's of Reapers fleeing at the mere sight of him, or will humanity and their allies die fighting like the Protheans before them?
Rated: T - English - Chapters: 7 - Words: 86,763 - Reviews: 48 - Favs: 108 - Follows: 149 - Updated: 4/20 - Published: 3/21/2019 - Master Chief/John-117, Cortana, Admiral Hackett, Shepard
It Started At Shanxi by SpaceTurtleOX reviews
One hundred years after the end of the Human-Covenant War an ill-fated UNSC expedition opens Relay 314, revealing a civilization unprepared for their arrival, and relics from a terrible past.
Rated: T - English - Sci-Fi/Adventure - Chapters: 13 - Words: 59,886 - Reviews: 372 - Favs: 1,095 - Follows: 1,723 - Updated: 4/15 - Published: 7/26/2019 - Master Chief/John-117, Cortana, Zaeed M., OC
Heroes UNITE! by So-Pro Warrior reviews
Commander Shepard and his team have gathered together the races of their Galaxy in an effort to defeat the Reapers. But is it enough? When the team comes across a strange woman they find out that if they are to truly defeat the Reapers once and for all. They will need all the help they can get. But not from their Universe. Multiverse Crossover! Chapters 6-22 Being Rewritten!
Rated: T - English - Adventure/Sci-Fi - Chapters: 42 - Words: 1,142,220 - Reviews: 735 - Favs: 287 - Follows: 291 - Updated: 4/6 - Published: 6/21/2013 - Master Chief/John-117, Shepard
Halo: Clash of Galaxies by Jochern reviews
Through unknown forces of immense and unimaginable power, two galaxies merge and superpowers of both galaxies is forced to deal with the reality of the broken status quo. Jane Shepard, first human Spectre, finds herself in the center of the events to come, for in the dark void outside the galaxy, the Reapers prepare their return to cleanse this new galaxy of life.
Rated: T - English - Sci-Fi/Adventure - Chapters: 14 - Words: 45,162 - Reviews: 59 - Favs: 185 - Follows: 283 - Updated: 3/27 - Published: 9/5/2019 - T. Hood, J. Garson, Garrus V.
Halo: Ascension - Status Update on Last Chapter by Hunter63 reviews
[ After the Great War, Humanity begins to rebuild, and while many challenges present itself to the surviving government, nothing will have as much as an impact as Shanxi. The Galaxy shall become the center point for an ancient threat's plans, people of all backgrounds must come together, and Humanity must finally ascend to its rightful throne as inheritors of the Mantle. ]
Rated: T - English - Sci-Fi - Chapters: 5 - Words: 14,217 - Reviews: 35 - Favs: 203 - Follows: 270 - Updated: 3/25 - Published: 5/31/2013 - Master Chief/John-117, Arbiter, J. Garson, Garrus V.
The Damaged ODST by Rookie1998 reviews
An ODST is mysteriously transported to the Mass Effect universe when a slip space accident occurs amidst the finale evacuation of Reach. Will he be a help or hindrance in the fight to come?
Rated: T - English - Adventure/Sci-Fi - Chapters: 5 - Words: 12,692 - Reviews: 13 - Favs: 33 - Follows: 64 - Updated: 3/7 - Published: 9/19/2019 - OC, Shepard
The Lost Civilization by Apollonir reviews
After the Battle of the Ark, a UNSC Pelican dropship crash lands on Thessia. Two ODSTs survive the crash and make contact with primitive Asari. Ninety thousand years later, Liara T'Soni discovers a strange looking aircraft and Human remains in an ancient cave burial chamber. The discovery she makes will take the Asari on a journey to discover their true lineage.
Rated: T - English - Mystery/Suspense - Chapters: 9 - Words: 16,933 - Reviews: 456 - Favs: 1,440 - Follows: 2,081 - Updated: 3/1 - Published: 7/2/2017 - Ashley W., Liara T'Soni, Mordin S., Shepard
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 slipstream warp 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: 13 - Words: 66,230 - Reviews: 367 - Favs: 927 - Follows: 1,285 - Updated: 2/25 - Published: 4/10/2019 - Master Chief/John-117, Cortana, Shepard
The Spartan Crew Member by Daisy Rhine reviews
Commander Shepard and his crew find the other half of the ship that MC is on. When they find him they have no idea what they should expect but an chemically suped up human was not one of them. I don't own Halo or Mass Effect 343industries and BioWare do.
Rated: T - English - Friendship/Adventure - Chapters: 36 - Words: 75,000 - Reviews: 211 - Favs: 340 - Follows: 456 - Updated: 2/21 - Published: 8/14/2017 - Master Chief/John-117, Garrus V., Tali'Zorah, Shepard
Accounts of the Flood conflicts by hunter 139 reviews
A multicrossover series of one-shots depicting several franchises and their encounters with the Flood. I do not own Halo or any other franchises depicted in these stories.
Rated: T - English - Horror/Sci-Fi - Chapters: 37 - Words: 93,943 - Reviews: 189 - Favs: 132 - Follows: 142 - Updated: 1/25 - Published: 1/15/2015 - Gravemind
Book One: Dawn of a New Age by DragonheartODST reviews
Humanity had been expanding across the stars for over 5 centuries in relative peace. But an alien alliance known as the Covenant wishes to destroy humanity entirely. Now threatened with extinction, can the fate of just one battle-scared survivor change the events of the war and those participating in it? Multi-crossover with Halo, Mass Effect, and a little bit of StarCraft. Hiatus
Rated: T - English - Adventure - Chapters: 14 - Words: 131,491 - Reviews: 289 - Favs: 318 - Follows: 373 - Updated: 1/3 - Published: 5/19/2016
Element Halo by Iron Warriors reviews
When we started to expand past the Orin Arm of the Milkyway, we didn't know what to expect. Once we were out there though, things changed big time. For those brief 30 years we were the top dogs of the galaxy in all powers but like always when humanity reaches a higher seat of power, something always comes to make us fall... This time however the fall will cost our entire race.
Rated: T - English - Sci-Fi - Chapters: 25 - Words: 85,332 - Reviews: 254 - Favs: 509 - Follows: 731 - Updated: 1/2 - Published: 12/11/2017 - OC
This, Our Galaxy by Jocson reviews
A short history of the Orion Arm of the Milky Way Galaxy, from the perspective of those existing within Systems Alliance space, submitted as part of my qualifying project on governmental analysis. July 25, 2585.
Rated: T - English - Sci-Fi/Friendship - Chapters: 2 - Words: 7,752 - Reviews: 8 - Favs: 17 - Follows: 21 - Published: 12/31/2019 - Complete
393 | Page 1 2 3 4 11 .. Last Next »