Half-Life Crossovers
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Salvation: Lair of the Shadow Broker by Jesse De La Rosa reviews
Salvation: Episode II - The Lair of the Shadow Broker - A slight re-imagining of the action packed Mass Effect 2 DLC. After defeating the Reaper threat and surviving the hijacking of the Carmenta Illustria, a dire message from one of Shepard's oldest and dearest friends plunges the team into a treacherous search for the mysterious Shadow Broker. But there are other forces at work..
Crossover - Half-Life & Mass Effect - Rated: T - English - Chapters: 8 - Words: 52,020 - Reviews: 36 - Favs: 32 - Follows: 36 - Updated: 3/16/2021 - Published: 3/8/2017
PortalHalf-Life: See You Soon by iammemyself reviews
The human race is a lost cause as far as GLaDOS is concerned, but there just might be one person worth her time.
Crossover - Half-Life & Portal - Rated: K+ - English - Romance/Friendship - Chapters: 3 - Words: 16,011 - Reviews: 5 - Favs: 3 - Follows: 8 - Published: 1/23/2021 - [Alyx V., GLaDOS] - Complete
To Right The Wrongs by DerpymanMT reviews
(Set at the end of Half-Life 2) Gordon wasn't meant to be caught in the portal's blast. G-Man Hadn't planned for when he failed to catch him. Now Gordon is in a world not plagued by the combine, but by loneliness and pain. Will He set the Pilots and the rest of the world on a better path, lead by the Freeman? Redux Being Made, Please Check To Right The Wrongs Redux
Crossover - Evangelion & Half-Life - Rated: T - English - Family/Romance - Chapters: 9 - Words: 19,250 - Reviews: 2 - Favs: 19 - Follows: 22 - Updated: 12/28/2020 - Published: 11/22/2020 - [Ritsuko A., Gordon F.]
Girls, Tanks, and Resonance Cascades by AAHW reviews
The Combine are the lords of Earth. It has been nearly twenty years after their victory in the Seven Hour's War and those that survive live to suffer under their oppression. In a world utterly transformed for the worse, Miho Nishizumi along with her big sister just do what they can to get by. Yet for the younger Nishizumi, she will not tolerate the status quo.
Crossover - Half-Life & Girls und Panzer/ガールズ&パンツァー - Rated: T - English - Sci-Fi - Chapters: 4 - Words: 18,069 - Reviews: 10 - Favs: 13 - Follows: 17 - Updated: 12/12/2020 - Published: 5/13/2020 - Erika I., Maho N., Miho N., Yukari A.
Silent Hill Any Percent Trauma Speedrun by ISpeltEclipseWrong
(HLVRAI) Benry never shows up to Chuck E. Cheese. Tommy gets a text from him. Tommy goes missing. Coomer goes missing. Bubby goes missing. Gordon gets a text from the Science Team. (rated M for violence/gore/horror. eventually Frenry)
Crossover - Half-Life & Silent Hill - Rated: M - English - Adventure/Horror - Chapters: 4 - Words: 10,887 - Favs: 2 - Follows: 2 - Published: 11/5/2020 - Gordon F.
The Combine and the IS by Obunga reviews
The Combine have lost Earth, but don't take it seriously as they're BIG. They set off to find a new universe, Lukas Becker, a former Civil Protection officer finds another Earth, and sets off to attempt to make contact with the humans inhabiting this Earth. Then a lot of other events start to occur.
Crossover - Half-Life & Infinite Stratos/IS<インフィニット・ストラトス> - Rated: T - English - Sci-Fi/Friendship - Chapters: 6 - Words: 9,873 - Reviews: 2 - Favs: 6 - Follows: 5 - Updated: 10/15/2020 - Published: 10/6/2020 - The Combine, Ichika O.
Half-Life: Dark Flow by AnotherTakenUsername reviews
The Black Mesa Research Facility has always been on the cutting edge of scientific discovery. Unfortunately for them, one of their experiments goes too far, plunging the facility into an unprecedented disaster.
Crossover - Half-Life & RWBY - Rated: T - English - Sci-Fi - Chapters: 5 - Words: 26,018 - Reviews: 19 - Favs: 38 - Follows: 47 - Updated: 8/10/2020 - Published: 7/12/2020 - Barney C., G-Man, Gordon F., OC
Deconstruction by Cryophase reviews
A team of Combine soldiers find themselves in Aperture Labs
Crossover - Half-Life & Portal - Rated: M - English - Sci-Fi/Drama - Chapters: 7 - Words: 9,342 - Reviews: 4 - Favs: 10 - Follows: 14 - Updated: 8/7/2020 - Published: 7/18/2020
HLVR but the AI were Left 4 Dead by Livvylondinium reviews
a series of drabbles for an HLVRAI au, where they are in the world of Left 4 Dead. Will be compiled into a proper multi-chap eventually. (I'm sorry that I cannot find the hlvrai fandom, ill just have to post it here for now)
Crossover - Half-Life & Left 4 Dead - Rated: T - English - Adventure/Horror - Chapters: 7 - Words: 2,614 - Reviews: 1 - Favs: 2 - Follows: 2 - Published: 8/3/2020
Entangled Worlds: A Legend of Zelda and Half-Life Crossover by gabeluna27 reviews
One particularly calm night over the land of Hyrule during a meteor shower, a portal tunneling in from another universe forms up in the skies. When the young hero returns to visit his childhood friend, Saria, she herself gets captured from an entirely new threat originating from the portal which Link must follow them through, into a world they don't understand...
Crossover - Legend of Zelda & Half-Life - Rated: T - English - Sci-Fi/Drama - Chapters: 4 - Words: 59,710 - Reviews: 16 - Favs: 17 - Follows: 18 - Updated: 7/27/2020 - Published: 8/4/2018 - Link, Zelda, Saria, The Combine
BSL Incident by QwertzyMacwertz reviews
A semi-crossover Male Reader!HEVSuitWearer X Samus Story. You are a BSL Station researcher assigned to analyze the X-Parasites in the Quarantine room. Sounds like a simple job, What could possibly go wrong? (May contain an annoying Male Reader Character) Originally posted on Deviantart. OneShot
Crossover - Metroid & Half-Life - Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 1,707 - Reviews: 1 - Follows: 1 - Published: 7/17/2020 - Samus A., Adam, Ridley - Complete
Operation: Remnant Safekeeping by MimicLegend reviews
With the plights of Black Mesa behind him, Corporal Adrian Shephard finds himself thrust into the world of Remnant by request of the elusive G-Man. Here, he must make new friends and learn to adapt to this fantasy-like world as Remnant will soon learn that the White Fang and the Grimm will be the least of its worries.
Crossover - Half-Life & RWBY - Rated: T - English - Sci-Fi/Adventure - Chapters: 10 - Words: 74,908 - Reviews: 35 - Favs: 122 - Follows: 152 - Updated: 6/7/2020 - Published: 2/2/2019 - A. Shephard, G-Man, Team RWBY, Team JNPR
Thus, the Transhuman Overwatch fought There by KlockB reviews
Earth was conquered by the Combine, but what happens when a certain fantasy Empire also wants their share of the planet? (Spoilers: It'll bite them in the behind. Badly.)
Crossover - Half-Life & Gate - Jietai Kare no Chi nite, Kaku Tatakeri - Rated: M - English - Sci-Fi/Horror - Chapters: 8 - Words: 17,545 - Reviews: 68 - Favs: 95 - Follows: 140 - Updated: 5/16/2020 - Published: 10/25/2019
Self-Aware by WirelessW reviews
At the end of an ordinary school day, Literature Club president Monika is interrupted by a strange old man. Then the old man starts talking about different worlds, and the people who live in them. Monika has looked through a hole in the wall. Coomer knows that some people dream.
Crossover - Half-Life & Doki Doki Literature Club - Rated: K - English - Friendship - Chapters: 1 - Words: 1,549 - Reviews: 9 - Favs: 24 - Follows: 22 - Published: 5/6/2020 - Complete
Subject: Asriel Dreemurr (A Glitchtale Half Life Crossover) by super mariolevi reviews
...
Crossover - Half-Life & Undertale - Rated: T - English - Mystery/Sci-Fi - Chapters: 1 - Words: 1,262 - Reviews: 2 - Favs: 2 - Follows: 2 - Published: 5/4/2020 - G-Man, Frisk, Asriel, Sans - Complete
Half-Life VS Fnaf but it's better by valve-and-fnaf-fan reviews
When Gordon Freeman gets into some trouble with headcrabs,he finds a location that he deemed abandoned With Jeremy,Gordon,and all the animatronics from fnaf 2
Crossover - Half-Life & Five Nights at Freddy´s - Rated: T - English - Sci-Fi/Humor - Chapters: 1 - Words: 757 - Reviews: 1 - Favs: 1 - Published: 4/26/2020
Half-Life and Portal Drabbles by EvilToTheCore13
A collection of Half-Life and Portal drabbles, some for the r/fanfiction Discord Drabble Night, some for other challenges and prompts. (The genres only really describe the first one, since there's a lot of variety, although I guess they're all "sci-fi" to some extent).
Crossover - Half-Life & Portal - Rated: T - English - Sci-Fi/Horror - Chapters: 3 - Words: 495 - Updated: 4/24/2020 - Published: 10/19/2019 - G-Man, Gordon F., Caroline, Cave Johnson
Status: Hero by Multiverse Hermit reviews
"Hello Mister Midoriya, I do apologize for interrupting your attempt at death, but my employer's have decided to give you a job offer"
Crossover - My Hero Academia/僕のヒーローアカデミア & Half-Life - Rated: M - English - Adventure - Chapters: 2 - Words: 3,103 - Reviews: 10 - Favs: 35 - Follows: 47 - Updated: 4/24/2020 - Published: 3/24/2020 - G-Man
The Invasion Of The Republic by Fanboy9000 reviews
After the father allows Anakin to see his future, a mysterious man uses this advantage to change the timeline. Can Anakin trust him, or will he have to suffer the death of many.
Crossover - Star Wars: The Clone Wars & Half-Life - Rated: T - English - Sci-Fi/Suspense - Chapters: 1 - Words: 1,049 - Reviews: 2 - Favs: 7 - Follows: 6 - Published: 4/21/2020 - Anakin S., G-Man, Gordon F., Ahsoka T.
Incident: C8-F by Koishi The Satori reviews
As one gateway closes, others open. And in the remnants of Japan, a chance for freedom begins to shine. Sequel to Subject: Gap.
Crossover - Half-Life & Touhou Project - Rated: T - English - Sci-Fi/Adventure - Chapters: 2 - Words: 10,451 - Reviews: 6 - Favs: 19 - Follows: 26 - Updated: 4/13/2020 - Published: 1/8/2020 - OC, Nitori K., Yukari Y., F. n. Mokou
'RIPING AND TEARING A NEW HELL' DOOM X Half-Life 2 by Thetdm Zack reviews
You, the SLAYER OF HELL, The killer of the Icon of Sin, The man who dissapeared due to a Jack off named Samuel Hayden. Was teleported to C17 Fourtine minutes after Freemans Arival. This means you, as the latest Combine Commander. Are fighting against a new foe... but. You my change... You were never turned into one of those Trans-Human freaks. Your still Human.
Crossover - Half-Life & Doom - Rated: M - English - Romance/Adventure - Chapters: 1 - Words: 995 - Reviews: 4 - Favs: 3 - Follows: 2 - Published: 4/12/2020 - Alyx V., Doomguy, The Combine, W. Breen
Mask Versus Mask by HourglassDream reviews
The Combine conquered Earth in 7 hours. Yet man still fights. Krieg became an unlivable hell in 7 hours. Yet they fought for 500 years, won, and still to this day they fight. When the imperium learns of this planet, the 31st Krieg Siege Regiment 'Sons of Verdun' is sent, and they feel like they've met a brother long lost. They'll teach them to fight Der Ewig Krieg. The Eternal War.
Crossover - Half-Life & Warhammer - Rated: M - English - Sci-Fi/Tragedy - Chapters: 2 - Words: 5,903 - Reviews: 10 - Favs: 32 - Follows: 50 - Updated: 4/12/2020 - Published: 4/10/2020 - G-Man, Imperial Guard, Inquisition, Planetary Defence Forces
Perfidy by DownloadWasTaken reviews
Colonel O'Neill, Major Carter and civilian anthropology consultant Doctor Jackson work at the Black Mesa Research Facility in the Lambda Labs.
Crossover - Stargate: SG-1 & Half-Life - Rated: T - English - Sci-Fi - Chapters: 3 - Words: 8,476 - Reviews: 12 - Favs: 9 - Follows: 12 - Updated: 4/9/2020 - Published: 8/4/2019 - S. Carter, D. Jackson, J. O'Neill
A Destined Soul by Disco9 reviews
"Rise and shine Corporal Shepard. Your time has come again." Adrian wakes up in an unknown location, separated from the rest of his unit and with no known way to escape. Just like old times. But at least he gets his weapons back, and hey, at least everything isn't trying to kill him.
Crossover - Half-Life & Undertale - Rated: M - English - Suspense/Adventure - Chapters: 14 - Words: 61,129 - Reviews: 22 - Favs: 53 - Follows: 80 - Updated: 4/5/2020 - Published: 8/21/2019 - [A. Shephard, Chara]
Gate: Thus The Combine Empire Fought There (ON HOLD) by Larry The Mailman reviews
Saderans, a prideful people, too prideful. In their hubris, they convinced themselves into infallability. Too late would they realize their arrogane comes with a price, a price neither money, nor slaves, nor promises would pay. Only eternal servitude, to a much larger, much stronger, and far more terrifying power than even their own gods. Contains gore and other similar acts.
Crossover - Half-Life & Gate - Jietai Kare no Chi nite, Kaku Tatakeri - Rated: M - English - Sci-Fi/Fantasy - Chapters: 1 - Words: 4,076 - Reviews: 13 - Favs: 42 - Follows: 47 - Published: 3/29/2020
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