Halo and
Mass Effect
Crossovers
13
The Call to War by
silencewillfall0091
In 2550 CE, 25 years into our war with the Covenant, a Turian fleet exploded out of the ice moon orbiting Lusitania. The Hierarchy, aching for a war since the humiliation of the Rachni invasion, stumbled into the most brutal conflict in recent galactic history.
T, English, Sci-Fi & Adventure, words: 2k+, favs: 60, follows: 85, 2/2
1
El Noble del Normandía Halo x Mass Effect » by
Aghriik
Reach, el bastión de la humanidad, ha caído. Uno de los Spartans del equipo Noble se quedó atrás para proteger al Pillar of Autumn, El es conocido como el Fantasma Viviente, el Lobo Solitario, la Parca Personal de la ONI... o simplemente, Noble Seis. Ahora, lejos de su hogar y su tiempo, deberá levantarse una vez más. No solo por un planeta. No solo por una especie. Una galaxia.
T, Spanish, Sci-Fi & Romance, chapters: 17, words: 154k+, favs: 10, follows: 11, updated: 2/1 published: 1/6, [SPARTAN-B312/Noble Six, Tali'Zorah] [Garrus V., Shepard]
38
The Terminus Exarchate » by
infamouswestgate
Qelet B'Norai, Batarian cartel-kin and agent of the Covenant, travels the swallowed-yet-undigested worlds of the Terminus Exarchate! Can he save the Covenant Empire from collapsing underneath its own great weight?
T, English, Sci-Fi, chapters: 26, words: 78k+, favs: 20, follows: 26, updated: 1/30 published: 9/11/2024
62
Halo Effect » by
kamilospl1312
What if UNSC replace System Allience from Mass Effect
T, English, Sci-Fi, chapters: 5, words: 15k+, favs: 98, follows: 161, updated: 1/26 published: 8/12/2024
2
Galactic Warbooks » by
DeafeningEcho
Throughout countless galaxies, civilizations have warred in the stars, clashing with their warships over endless worlds. Each of these civilizations calls their ships something different, let's find out what those are.
K, English, Sci-Fi, chapters: 8, words: 15k+, favs: 2, follows: 4, 1/24
65
Into the Howling Dark » by
long night of solace
Hundreds of millions of years ago, Humanity, Forerunners and the SanShyuum, the tier-1 species protected the galaxy. But the peace never lasted as the threat of flood and the reapers brought the Milkyway to the edge of extinction. Now the warriors of the past needs to guide the future galaxy and stop history from repeating itself.
T, English, Sci-Fi & Adventure, chapters: 7, words: 57k+, favs: 184, follows: 247, updated: 1/19 published: 10/23/2024, Master Chief/John-117, Didact, D. Anderson, Shepard
159
Echoes of the Forerunners: A Covenant Unveiled » by
Phorus Aedelmaer
The Covenant War erupts with far-reaching consequences across two universes. As the UNSC struggles to survive, they form an unexpected alliance with the species of the Citadel Council. Creative liberties will be taken with the timelines, events, and characters of both franchises.
K+, English, Sci-Fi, chapters: 17, words: 33k+, favs: 179, follows: 258, updated: 1/4 published: 9/8/2024
3
To The Stars and Beyond: The Babysitter by
tysons23
Cal - 141 and an ODST squad on board the cruiser OCS Ascraeus are sent on a mission to investigate some mysterious alien ruins and assasinate a high value targed in Covenant- controlled space.
T, English, Sci-Fi, words: 10k+, favs: 13, follows: 16, 10/20/2024, O'Brien, Cal-141
57
Odyssey of the Untrodden » by
RamPluto
After centuries of relative peace and isolation, the races of Citadel Space have decided to make the bold and historic step of activating a dormant Relay. Unknowing stumblingly into a war that will change the shape of the entire galaxy.
T, English, Adventure & Sci-Fi, chapters: 2, words: 8k+, favs: 216, follows: 350, updated: 10/5/2024 published: 10/1/2024, Master Chief/John-117, Garrus V., Tali'Zorah, Liara T'Soni
600
The Sins of our Fathers » by
MarkerMagnum
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.
T, English, Drama & Sci-Fi, chapters: 14, words: 147k+, favs: 1k+, follows: 2k+, updated: 9/1/2024 published: 2/11/2023, Cortana, Councilor Valern, Councilor Tevos, Councilor Sparatus
1k+
The Reclamation » by
Fade Maybe
Through ONI's manipulation, the UNSC stumbles upon a Mass Relay and is dragged into a new war. They'll discover the battered races of the Citadel, the political intrigue of its factions, and a second group of humans governed by the Systems Alliance, divided by Cerberus, and lead by Commander Shepard. Yet no one can stop what is to come: the Reclamation, and the death of the galaxy.
T, English, Drama & Suspense, chapters: 54, words: 407k+, favs: 1k+, follows: 2k+, updated: 7/25/2024 published: 3/13/2013
46
Massive Reckoning: Interstellar Assualt » by
vmoneywashere
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)
K+, English, Sci-Fi, chapters: 4, words: 31k+, favs: 271, follows: 380, updated: 6/18/2024 published: 10/9/2023, P. Cole, OC, Admiral Hackett, Shepard
23
Halo: A New Journey » by
mgarner3199
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...
K, English, Sci-Fi & Romance, chapters: 4, words: 4k+, favs: 56, follows: 95, updated: 5/18/2024 published: 12/7/2021, Cortana, Master Chief/John-117, Illusive Man, Shepard
441
The Wreck » by
Gabenator5
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...
T, English, Fantasy & Sci-Fi, chapters: 8, words: 25k+, favs: 1k+, follows: 2k+, updated: 5/11/2024 published: 1/7/2018, Tali'Zorah
751
Voyage unto Infinity » by
supertruckin
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
T, English, Sci-Fi & Adventure, chapters: 16, words: 92k+, favs: 2k+, follows: 2k+, updated: 4/26/2024 published: 4/10/2019, Master Chief/John-117, Cortana, Shepard
50
Mass Effect: Forward Unto Dawn » by
WildcatWarrior67
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.
T, English, Sci-Fi & Adventure, chapters: 5, words: 10k+, favs: 264, follows: 449, updated: 3/20/2024 published: 11/26/2022, Master Chief/John-117, Cortana, Shepard
20
Legacy by
WisdomOfCelestials
Keys, Answers, Questions, Doors. What starts, What ends? Lord of Admirals, Lord of Beggars. Time and Un-Time
T, English, words: 9k+, favs: 96, follows: 115, 2/19/2024
624
The Sword of the Geth » by
Doctor poo and the TURDIS
Dying on Mantle's Approach, Cortana wakes up in an unfamiliar environment. In her drive to get home, she 'employs' the assistance of the local synthetics. She never wanted to be a galactic overlord. But a UNSC AI in an environment woefully unprepared for one of her caliber makes an easy one.
T, English, Sci-Fi & Humor, chapters: 23, words: 123k+, favs: 1k+, follows: 2k+, updated: 2/4/2024 published: 11/23/2023, Cortana, Shepard
131
On the Shoulders of Giants » by
Shoot The Runner
Two galaxies thrown together by a cosmic fluke. On one side of the galaxy, the war-weary UNSC vows to rebuild and become a giant in the stars so that they will never be so helpless again. Whilst another humanity is still finding its feet in the Citadel, with treachery and politics hindering its progress. How does the merging of two galaxies impact the course of all of their fates?
T, English, Sci-Fi & Adventure, chapters: 2, words: 19k+, favs: 462, follows: 673, updated: 1/14/2024 published: 6/20/2023, Master Chief/John-117, T. Hood, Shepard, D. Udina
1k+
All the Stars » by
BlueWay
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.
T, English, Sci-Fi & Adventure, chapters: 46, words: 802k+, favs: 1k+, follows: 2k+, updated: 11/9/2023 published: 6/8/2018, SPARTAN-B312/Noble Six, Rookie, Shepard
663
It Started At Shanxi » by
SpaceTurtleOX
Fifty 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.
T, English, Sci-Fi & Adventure, chapters: 17, words: 90k+, favs: 2k+, follows: 2k+, updated: 9/16/2023 published: 7/26/2019, Master Chief/John-117, Cortana, Zaeed M., OC
11
Spectre with a Spartan Sister » by
ZeBear
In 2574, after the formation of the United Sentient Species Federation, they find more intelegent life. Having infiltrated the Normandy Project, they save John Shepard from dying after the Collectors attack at the end of Mass Effect 1. Neglecting to tell his friends. Now with and entire Federation of Species behind him, instead of Cerberus, how will John deal with it all?
T, English, Sci-Fi, chapters: 5, words: 6k+, favs: 67, follows: 104, updated: 8/20/2023 published: 7/28/2023, [Shepard, Tali'Zorah] Garrus V.
1k+
The Unknown Defender » by
Gabenator5
A new faction stirs, its green-clad enforcers seemingly unstoppable. Rumors spread, pirate bases go dark, and both the enslaved and kidnapped are discovered free. Who are these new interlopers, and what is their goal? For good or ill, the powers that be intend to find out.
T, English, Adventure & Sci-Fi, chapters: 19, words: 153k+, favs: 4k+, follows: 5k+, updated: 7/30/2023 published: 9/27/2016, Master Chief/John-117, Cortana, Tali'Zorah, Leviathan
349
Unknown events have unmeasurable answers » by
El callampas
When someone contacts the Quarians about old machinery, they should think twice before engaging with a strange yet so familiar species, a war, and circumstances that will shock two galaxies now that the rift is open.
T, English, Sci-Fi & Drama, chapters: 19, words: 171k+, favs: 631, follows: 868, updated: 6/25/2023 published: 4/21/2022, [Master Chief/John-117, Tali'Zorah] J. Cutter
3
Un grand angle d'ombre » by
blackshamrock333
2560. L'humanité a survécu à la grande guerre contre les covenants et découvert l'espace concilien. Le Longest Day, prowler de l'UNSC en mission secrète, débarque en pleine attaque d'une colonie frontalière. Quelques jours plus tard, un médecin humain est découvert assassiné sur la Citadelle. Deux événements aléatoires, annonciateurs d'une course pour sauver la galaxie.
T, French, Sci-Fi & Adventure, chapters: 3, words: 35k+, favs: 7, follows: 11, updated: 5/9/2023 published: 1/27/2023
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