Halo and Mass Effect Crossovers
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Balaho Effect by Oledom reviews
In the Year 2142, Unggoy explorers on Buwan discovered the remains of an ancient spacefaring civilization. They called it the greatest discovery in Unggoy history The civilizations of the galaxy call it. Mass Effect
Rated: T - English - Sci-Fi/Humor - Chapters: 4 - Words: 6,340 - Reviews: 19 - Favs: 53 - Follows: 60 - Updated: 2/19 - Published: 1/28
Changing Universes by GamerDroid56 reviews
I am a Spartan. I was in one universe, finishing this fight, when I was sucked into another universe. Can I save humanity from yet another more powerful alien race? Will I be able to end the Reaper threat? Read to find out! Starts during ME2
Rated: T - English - Sci-Fi/Friendship - Chapters: 6 - Words: 6,542 - Reviews: 8 - Favs: 18 - Follows: 35 - Updated: 2/17 - Published: 10/7/2016 - OC, Shepard (F), Admiral Hackett, Miranda L.
Mass Effect - The Great Journey by ImperialSalesman reviews
Commander Shepard had failed. The Cycle continued, as planned. Now, the last cycle's failure will be the next cycle's trial, as the Great Journey draws ever near. Fighting against powers far beyond his own abilities, it is now up to Shipmaster Thel 'Vadamee to halt the return of the galaxy's most ancient foes, as dark powers work against everything he holds dear. (Halo AU)
Rated: T - English - Sci-Fi/Adventure - Chapters: 6 - Words: 21,848 - Reviews: 8 - Favs: 15 - Follows: 22 - Updated: 2/17 - Published: 2/3 - Arbiter, Rtas 'Vadumee, R. Moramee, Shepard (F)
Of The Future And Past by IAnswerToNoOne reviews
The UNSC/Covenant war is over. The UNSC, Covenant, and Prometheans have joined to create the Republic of Sentient Species and are now an almost galaxy-wide power. Still, with the discovery of a device in space, and learning of a new enemy, will the RSS be able to react in time?
Rated: T - English - Adventure - Chapters: 8 - Words: 20,830 - Reviews: 87 - Favs: 188 - Follows: 255 - Updated: 2/16 - Published: 10/1/2016
Mirrored Fates by long night of solace reviews
After the defeat of the didact, the galactic hero of the halo universe - Masterchief and his loyal blue team members embark on a strange new journey to an unknown universe in which later they come into contact with that universe's hero - Commander Shepard. Facing an unknown enemy, fighting a new war, its up to the heroes to save the day together.
Rated: T - English - Sci-Fi/Adventure - Chapters: 17 - Words: 132,813 - Reviews: 109 - Favs: 187 - Follows: 233 - Updated: 2/14 - Published: 5/3/2016 - Master Chief/John-117, Cortana, Admiral Hackett, Shepard (M)
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: 23 - Words: 154,094 - Reviews: 620 - Favs: 963 - Follows: 1,322 - Updated: 2/13 - Published: 11/26/2013 - Master Chief/John-117, Cortana, Shepard (F)
The Reclamation has already begun by Fade Maybe reviews
The Master Chief has defeated the Didact. Across the galaxy, the Reaper War wages on as the Citadel races struggle to survive while Commander Shepard and the crew of the SSV Normandy fights on. But a deeply divided UNSC discovers a Mass Relay that will change the course of the war and galactic history forever. The Reclamation has already begun. And we are hopeless to stop it.
Rated: T - English - Adventure/Sci-Fi - Chapters: 15 - Words: 160,866 - Reviews: 506 - Favs: 525 - Follows: 692 - Updated: 2/13 - Published: 3/13/2013
What Is It Worth? by The Best of Luck reviews
Humanity has known the Citadel Alliance for over six decades. After sixty years of isolation and limited contact, the UNSC have decided to open up more. When a joint dig at a Prothean site goes wrong, Commander Shepard will lead a mixed team consisting of the best the galaxy has to offer, regardless of their species, after one of the greatest enemies humanity has ever faced.
Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 3,127 - Reviews: 3 - Favs: 27 - Follows: 33 - Published: 2/12
Halo: Second Contact by Helezhelm reviews
What if Halo universe collides with Mass Effect universe! How would System Alliance among Council Citadel races react to another human race in other galaxy? We only will find out in upcoming fanfiction!
Rated: T - English - Sci-Fi/Adventure - Chapters: 6 - Words: 5,818 - Reviews: 54 - Favs: 168 - Follows: 204 - Updated: 2/10 - Published: 4/29/2015
Halo New galaxy by Commander Kelec reviews
In 2554 the UNSC made contact with the Citadel races. But not everyone wants peace. Is cooperation between the UNSC and Citadel possible against the ex-Covenant splinter factions or will it turn into a three way war. ODST Lt Colonel John Shepard and Spartan Fireteam Crimson is right in the middle of it.
Rated: T - English - Sci-Fi/Adventure - Chapters: 14 - Words: 43,570 - Reviews: 32 - Favs: 51 - Follows: 72 - Updated: 2/5 - Published: 11/21/2016 - Garrus V., U. Wrex, Shepard (M)
A Dark Occupation by mcd3424 reviews
Thessia has fallen and is now shadowed under the banner of the UNSC Eagle. Humanity now rules the Asari homeworld with an iron fist. There are many stories that can be told during this dark time. Here are a few from those who were there, accounts from both Human and Asari, Soldier and Civilian, Freedom fighter and Occupier. (Prequel to Dark Rising).
Rated: T - English - Tragedy - Chapters: 3 - Words: 2,155 - Reviews: 18 - Favs: 11 - Follows: 12 - Updated: 2/2 - Published: 1/19
Origins: A Dark Codex by mcd3424 reviews
Codex to Origins: Dark Rising. Includes Characters, Events, Timelines, and other important crap. Still under revision but while I work on revising Dark Rising this is where all that codex stuff will be.
Rated: T - English - Chapters: 1 - Words: 4,839 - Reviews: 1 - Favs: 4 - Follows: 4 - Published: 2/1
The Long Way Forward by DeathBladeVI reviews
A retelling of Mass Effect with the UNSC. After a joint-dig gone wrong, the UNSC sends Commander Shepard against Saren, the turian Spectre who attacked Eden Prime. Faced with being humanity's image to the rest of the galaxy, Shepard must deal with the Council, another turian Spectre, and being under the command of a captain determined to clear the name of her father.
Rated: T - English - Sci-Fi/Adventure - Chapters: 3 - Words: 7,686 - Reviews: 17 - Favs: 36 - Follows: 49 - Updated: 1/31 - Published: 1/28
Halo Mass Effect : Colonial War by tobiisagoodboy94 reviews
When a research ship finds a anomoly at the edge of Harvests system, a young militiaman and the whole UNSC are thrown into a galaxy much larger than they could have dreamed. Pre-war UNSC, with a mixture of Halo and Mass Effect characters and some OCs, all fighting for humanitys and maybe, if time and money is left over, the Citadels future.
Rated: T - English - Sci-Fi/Adventure - Chapters: 6 - Words: 32,888 - Reviews: 45 - Favs: 79 - Follows: 108 - Updated: 1/29 - Published: 1/11 - T. Lasky, OC, Garrus V., Shepard (M)
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: 16 - Words: 30,867 - Reviews: 72 - Favs: 51 - Follows: 62 - Updated: 1/29 - Published: 1/15/2015 - Gravemind
Origins: Dark Rising by mcd3424 reviews
Humanity has won. The Citadel has fallen, the Council abolished, Thessia subjected to occupation. An Imperialistic humanity now rules the galaxy with an iron fist. Resistance will not be tolerated. There are no more good guys, the bad guys won and it's now up to those in the middle to heal a galaxy gone mad. AU universe Star Wars/Mass Effect/ Halo Crossover [UNDER REVISION]
Rated: T - English - Adventure/Sci-Fi - Chapters: 15 - Words: 60,954 - Reviews: 98 - Favs: 54 - Follows: 71 - Updated: 1/23 - Published: 11/7/2016 - P. Cole, OC, Liara T'Soni, D. Anderson
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: 32 - Words: 301,976 - Reviews: 2531 - Favs: 2,732 - Follows: 3,333 - Updated: 1/20 - Published: 10/9/2013 - Master Chief/John-117, T. Lasky, Admiral Hackett, Shepard (M)
The Demon Effect by SSJ Lone Wolf reviews
Noble Three, Five and Six. after surviving Reach are upgraded with forerunner augmentations, amour, weapons, given a new A.I and a new Ship before they fly through a portal only to be transported to an entirely new universe and arrive in 2176 CE where the Colony of Elysium is under attack by Batarian's. Halo x Mass Effect x Star wars fic
Rated: T - English - Sci-Fi - Chapters: 2 - Words: 13,235 - Reviews: 23 - Favs: 98 - Follows: 125 - Updated: 1/17 - Published: 1/16 - Jorge-052/Noble Five, Jun-A266/Noble Three, SPARTAN-B312/Noble Six, Shepard (F)
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: 22 - Words: 509,562 - Reviews: 221 - Favs: 144 - Follows: 137 - Updated: 1/16 - Published: 6/21/2013 - Master Chief/John-117, Shepard (M)
Challenge A Shepard into the Halo Universe by Zealswordsmen reviews
Okay so, we all see the fics were Master chief comes into the Mass Effect universe and beat the shit out of the galaxy. That great and all and fun. I would like to see a Shepard coming into the Halo universe and doing what Shepard does better. Bringing people together.
Rated: K - English - Chapters: 1 - Words: 411 - Reviews: 6 - Favs: 1 - Follows: 1 - Published: 1/16 - Complete
A VERY BIG MASS EFFECT by cyrus saint 1st true god reviews
a remembrance day of the great war was under way when a slip- space portal drags the fleets of both parties in to the mass effect 3, the reapers are going to die a horrible death [in progress]
Rated: T - English - Adventure/Sci-Fi - Chapters: 5 - Words: 11,003 - Reviews: 20 - Favs: 50 - Follows: 62 - Updated: 1/10 - Published: 10/7/2016 - Master Chief/John-117, P. Cole, T. Lasky, Shepard (M)
Halo 3:The Rookie by death7559 reviews
The Rookie. One of those strong, silent, types. After finding himself trapped in a strange alien universe, The Rookie joins on with commander Shepard to hunt down a rogue SPECTRE who may just know The Rookie. On Hiatus.
Rated: T - English - Chapters: 4 - Words: 3,409 - Reviews: 49 - Favs: 75 - Follows: 132 - Updated: 1/4 - Published: 4/1/2014 - Rookie, Shepard (F), Garrus V., Tali'Zorah
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.
Rated: T - English - Adventure - Chapters: 9 - Words: 95,855 - Reviews: 145 - Favs: 156 - Follows: 185 - Updated: 1/1 - Published: 5/19/2016
The Avalon Federation Codex by DragonheartODST reviews
A full codex dedicated to the characters, cultures, places, objects, times, etc., related to the Concordian Cycle starting from Book One: Dawn of a New Age. Will be constantly updated alongside the books to fit with the details of the series. Please read the series first if you wish to gain a greater understanding.
Rated: T - English - Sci-Fi - Chapters: 3 - Words: 17,274 - Reviews: 12 - Favs: 13 - Follows: 12 - Updated: 1/1 - Published: 11/30/2016
The Last Spartan by DinoJake reviews
An AU fic in which the Halo and ME universes share the same galaxy. After a well deserved rest in Cryo-Sleep, Master Chief finally awakens...to a whole new galaxy.
Rated: T - English - Sci-Fi/Adventure - Chapters: 51 - Words: 461,909 - Reviews: 3461 - Favs: 3,162 - Follows: 3,224 - Updated: 1/1 - Published: 5/2/2010 - Master Chief/John-117
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