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

Halo-Mass Effect: Altered-Destiny by Azores reviews
In 2531 during the early years of the Great War, UNSC Spirit of Fire went missing and was declared lost with all hands. But what if the Spirit wasn't lost and adrift in space. What if it was sent to another Galaxy, before the Humans of this Galaxy hadn't discovered a certain set of ruins yet. How will Humanity's future change? How will the Galaxy be changed? Start 2100 AD. Book 1/3
Rated: T - English - Sci-Fi - Chapters: 10 - Words: 80,804 - Reviews: 269 - Favs: 512 - Follows: 678 - Updated: 11/20 - Published: 1/25 - J. Cutter, P. Cole, U. Wrex, Aria T'Loak
A Feeling of Importance by LebendenToten reviews
Well, after reading quite a bit of fanfiction I decided that maybe it was finally time for me to try and crank out one of my own. This is going to be a self insert story of sorts that starts in the Halo universe then eventually transitions to Mass Effect. This is my first Fanfic so be nice :P and constructive criticism/suggestions welcome! Rated T mainly for language.(changed to T)
Rated: T - English - Adventure/Friendship - Chapters: 18 - Words: 32,297 - Reviews: 117 - Favs: 145 - Follows: 203 - Updated: 11/16 - Published: 11/6/2014 - Master Chief/John-117, C. Halsey, OC, Shepard (F)
The Infinity Effect by creamofwheat2311 reviews
After discovering a Precursor artifact, the UNSC Infinity and the Sangheili Shadow of Intent are transported to a universe unlike anything they have ever seen, and forced into a war against a foe they never could have imagined: the Reapers. Alliances are founded, friendships are formed, and decisions are made that will change this galaxy forever. Post Halo 4, Pre ME3. AU
Rated: T - English - Sci-Fi/Adventure - Chapters: 23 - Words: 232,367 - Reviews: 1966 - Favs: 2,117 - Follows: 2,649 - Updated: 11/16 - Published: 10/9/2013 - Master Chief/John-117, T. Lasky, Admiral Hackett, Shepard (M)
The Halo Effect by Agentweapon-Proelium Tempus reviews
The UNSC dispatches a small task force to investigate an artefact with origins not of the Orion Arm. The Citadel Races, including the Systems Alliance, are in for an eye opener when two new players in galactic prowess are not only technologically superior but also not bound by the Element Zero and its constraints. Rated T for reasons. AU in both Halo and ME events.
Rated: T - English - Adventure/Humor - Chapters: 5 - Words: 20,534 - Reviews: 121 - Favs: 432 - Follows: 587 - Updated: 11/9 - Published: 8/6 - Master Chief/John-117, OC, Shepard (F)
Effects of a Titan by greeneman42 reviews
A small salvage ship comes across an interesting find while searching. Set before Halo 4 and before ME 2
Rated: T - English - Adventure/Sci-Fi - Chapters: 7 - Words: 30,035 - Reviews: 199 - Favs: 354 - Follows: 521 - Updated: 11/9 - Published: 11/26/2013 - Master Chief/John-117, Cortana, Shepard (F)
Mass Effect: The New Journey by Arashi the Solar Phoenix reviews
During a Joint Deployment, the UNSC Infinity and Her Sangheili allies are suddenly thrown into a new Galaxy, and end up near Charon before the Systems Alliance discovers the Charon Relay. Alliances are forged and how will the galaxy react to an aggressive humanity that not only doesn't use Mass Effect technology, but will not let anyone stand in their way of expansion? AU PreME1
Rated: T - English - Sci-Fi/Adventure - Chapters: 16 - Words: 147,507 - Reviews: 1061 - Favs: 1,604 - Follows: 1,988 - Updated: 11/7 - Published: 1/26/2014
Accounts of the Flood conflicts by hunter 139 reviews
A 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: 10 - Words: 14,191 - Reviews: 39 - Favs: 22 - Follows: 31 - Updated: 11/5 - Published: 1/15
Infinity by casquis reviews
Space is infinite, but under the right conditions even a galaxy can feel too small.
Rated: T - English - Sci-Fi - Chapters: 3 - Words: 9,417 - Reviews: 86 - Favs: 143 - Follows: 228 - Updated: 11/5 - Published: 10/12
HaloEffect: Rise of The Republic by Fernix13 reviews
When Great War ended, humanity and covenant merged. New formed Republic of Orion Arm is trying to create a war-free civilization, but what will happen when empire of 3000 worlds will meet another galactic goverment? Rated T for blood, death etc. Multiverse crossover
Rated: T - English - Sci-Fi - Chapters: 6 - Words: 17,499 - Reviews: 72 - Favs: 250 - Follows: 325 - Updated: 11/1 - Published: 8/24
Unflinching Resolve by gwb99 reviews
The Human/Covenant was a long one, billions died on both sides yet Humanity always stood tall, fought back and kept going even when it seemed impossible. For the UNSC battlegroup Lima they will need to do this once again when they are thrown into another universe entirely and for one SPARTAN super soldier she'll need to overcome her hate and learn to trust those she despises.
Rated: T - English - Adventure/Sci-Fi - Chapters: 3 - Words: 13,786 - Reviews: 22 - Favs: 62 - Follows: 102 - Updated: 10/28 - Published: 9/4 - Kurt-051, OC, Admiral Hackett, 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 Commander and his team come 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!
Rated: T - English - Adventure/Sci-Fi - Chapters: 17 - Words: 441,427 - Reviews: 145 - Favs: 91 - Follows: 80 - Updated: 10/22 - Published: 6/21/2013 - Master Chief/John-117, Shepard (M)
The Sum is Greater than its Parts by Maersikai reviews
Having long since combined forces, a fleet of the Humans and Covenants finest are torn from the universe they know to be thrown in to a strange and desolate reality. They will strive to uphold the Mantle against the Mass Effect's most Ancient Enemy. Will they break the cycle?
Rated: T - English - Sci-Fi - Chapters: 16 - Words: 155,749 - Reviews: 243 - Favs: 640 - Follows: 809 - Updated: 10/21 - Published: 3/2 - T. Hood, Cortana, Shepard (F)
Halo The Evolution Continues by UNSpaceCommand reviews
First time Crossover. Constructive Critic welcome. Enjoy and pls Review. Chapter 27 is up. A long lost ship is returning home but it seems fate have a decision to make a mess of things. Looking for Beta Reader.
Rated: T - English - Sci-Fi - Chapters: 27 - Words: 56,469 - Reviews: 315 - Favs: 425 - Follows: 499 - Updated: 10/14 - Published: 9/22/2011
Shadow Contingency by Andrithir reviews
As the war against the Covenant takes another turn, humanity must confront a wider galactic community beyond the known regions.
Rated: T - English - Adventure/Sci-Fi - Chapters: 4 - Words: 48,788 - Reviews: 52 - Favs: 143 - Follows: 186 - Updated: 10/13 - Published: 7/15 - Master Chief/John-117, Shepard (F)
The Spirit of Thessia by NewWorldFiction reviews
For several decades the Spirit of Fire has lumbered through the empty void to find not the UNSC, but something terrible: The destruction of the newly space faring civilization of the Asari by the hands of the Batarian Hegemony, a slaver species. Now, forced into a war that is impossible to win, the crew will face insurmountable odds against a enemy that cannot be beat. One-shot.
Rated: T - English - Chapters: 2 - Words: 14,755 - Reviews: 35 - Favs: 129 - Follows: 93 - Updated: 10/12 - Published: 7/29 - Complete
New Galaxy, Same Problems by Sheogorath's Avatar reviews
After recovering a broken and barely-sane Cortana, Chief is sucked into the ME 'verse by a slipspace anomaly. How will he deal with the knowledge that his only remaining friend is now illegal? REWRITE PENDING
Rated: T - English - Sci-Fi/Drama - Chapters: 2 - Words: 1,788 - Reviews: 10 - Favs: 38 - Follows: 67 - Updated: 10/10 - Published: 10/8 - Master Chief/John-117, Cortana, Shepard (M)
Of Ancients and Giants by Mediam Noctem reviews
The war is over. Billions are dead. Hundreds of planets are forever tainted. In this grim, hopeless future, humanity finds itself fighting day-by-day for the right to exist in a universe that shows no mercy. Yet things only get more complicated with the arrival and invasion by a new species of aliens who expose humanity to a much larger galaxy... and Greater Evil. (AU Pre-Halo 4)
Rated: T - English - Sci-Fi - Chapters: 4 - Words: 24,395 - Reviews: 55 - Favs: 97 - Follows: 125 - Updated: 10/10 - Published: 7/17 - Fred-104, J. Locke, Shepard (F)
The Fighting Spirit by smart grid reviews
Spartans never die, they say. When Jorge gave his life to save his home planet of Reach, he never imagined that he would survive. But now he finds himself neck deep in the troubles of another universe; he will do what he has been trained to do, what all Spartans do best: fight.
Rated: T - English - Adventure - Chapters: 36 - Words: 168,046 - Reviews: 627 - Favs: 803 - Follows: 1,042 - Updated: 10/8 - Published: 12/1/2011 - Jorge-052/Noble Five, Shepard (F)
Halo-Mass Effect: Codex by Azores reviews
Welcome to the Codex for the Crossover Book, Halo-Mass Effect: Altered Destiny. This Codex is to help get more in depth with the world of this Universe and explore more in depth certain events such as the Fall of Lorek and the Terra Nova Campaign, along with giving some key information on warships of the H-ME Universe. Enjoy.
Rated: K - English - Chapters: 5 - Words: 14,516 - Reviews: 12 - Favs: 19 - Follows: 31 - Updated: 10/1 - Published: 3/15 - J. Cutter, P. Cole, OC, Aria T'Loak
Mass Effect: Contact by FuzyDr4G0NZ reviews
In 2560, just years after the end of hostilities between the Earth based UNSC and the New Colonial Alliance, the Industrial colony of Falkland is slowly being turned into a Fortress as a defense against the perceived Colonial threat. But within months of his transfer to the colony, Lance Corporal David Campbell will find out first hand whether or not the fortress will hold.
Rated: T - English - Adventure/Sci-Fi - Chapters: 16 - Words: 49,383 - Reviews: 188 - Favs: 240 - Follows: 338 - Updated: 10/1 - Published: 5/8/2014 - OC
The Signal by NewWorldFiction reviews
A single world lies a mere 1000 light years from earth. It's a garden world, just like any other. Except for one thing: there's A signal. Mini One-shot. Possible to longer and more detailed rewrite.
Rated: T - English - Mystery/Tragedy - Chapters: 1 - Words: 892 - Reviews: 13 - Favs: 26 - Follows: 24 - Published: 9/12 - Liara T'Soni - Complete
Halo Mass Effect: The New Dawn by OverLord3475 reviews
Humanity has joined forces with their former enemies to form the OSA, they have formed new alliances that have made them stronger, but what awaits them beyond the relay are they ready for a new chapter? inspired by Halo a new age and HaloMasssEffect: ruptured universe. this is a multicrossover (other franchises).
Rated: T - English - Sci-Fi - Chapters: 4 - Words: 27,016 - Reviews: 68 - Favs: 175 - Follows: 237 - Updated: 9/5 - Published: 7/1/2014 - Master Chief/John-117, Shepard (M)
The Cycle by Church -Caboose- Shepard reviews
Fighting off extinction Shepard must find the legacy left to humanity by the Forerunners. And find a way to defeat both the Reapers and the Prophet of Truth from gaining the power to destroy all sentient life in the Galaxy.
Rated: T - English - Sci-Fi/Adventure - Chapters: 29 - Words: 78,417 - Reviews: 115 - Favs: 34 - Follows: 47 - Updated: 9/2 - Published: 8/29/2012 - Arbiter, Prophet of Truth, Shepard (M), OC
Heart of the Storm by Cypherian reviews
Reach has fallen and Noble Six is all that remains on the planet. In a valiant last stand Six mysteriously finds himself in the world of another. How will he come to terms with it? What will he do? Can he overcome his loss and find peace at last? Six pairing is yet to be decided. Plan to span over whole mass effect series and possibly beyond. (Alternate Universe)
Rated: T - English - Adventure/Romance - Chapters: 14 - Words: 24,947 - Reviews: 77 - Favs: 170 - Follows: 252 - Updated: 8/30 - Published: 3/4 - SPARTAN-B312/Noble Six, Garrus V., Tali'Zorah, Shepard (M)
Shattered Universes by general MB reviews
Ch 12: Commander Shepard tries to sell his origin story to the people of Earth and Reach, while Halsey and Mordin's plan hits a snag. The Master Chief and his spartans are given a secret mission, as pieces start to fall into position. Events are occurring that will shape everything else that is to come.
Rated: T - English - Sci-Fi/Adventure - Chapters: 12 - Words: 86,373 - Reviews: 313 - Favs: 316 - Follows: 398 - Updated: 8/24 - Published: 1/3/2011 - [Tali'Zorah, Shepard (M)] Master Chief/John-117, J. Keyes
341 | Page 1 2 3 4 11 .. Last Next »