Half-Life Crossovers
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Subject: Asriel Dreemurr (A Glitchtale Half Life Crossover) by super mariolevi reviews
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Crossover - Half-Life & Undertale - Rated: T - English - Mystery/Sci-Fi - Chapters: 1 - Words: 1,262 - Reviews: 1 - 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
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 - 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: 32 - Follows: 44 - 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: 5 - Follows: 4 - 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: 5 - Favs: 16 - Follows: 22 - 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: 2 - 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: 30 - Follows: 48 - 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: 11 - Favs: 8 - Follows: 10 - 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: 21 - Favs: 40 - Follows: 60 - Updated: 4/5/2020 - Published: 8/21/2019 - [A. Shephard, Chara]
Gate: Thus The Combine Empire Fought There 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: 11 - Favs: 34 - Follows: 39 - Published: 3/29/2020
Finally Human (A Portal Fanfiction) RETURNING by Morgan64 reviews
What would happen if Wheatley and GLaDoS were finally human?
Crossover - Half-Life & Portal - Rated: T - English - Sci-Fi/Mystery - Chapters: 5 - Words: 1,809 - Reviews: 1 - Favs: 6 - Follows: 4 - Updated: 3/12/2020 - Published: 12/2/2015 - GLaDOS, Wheatley
Freeman's Mind in Neptunia by Uranium Whale reviews
Follow the thoughts of Dr. Gordon Freeman, a 27 year old theoretical physicist, neurotic individual, and a unique "hero" to a new strange world. (Rating may change.)
Crossover - Half-Life & Hyperdimension Neptunia - Rated: T - English - Humor - Chapters: 10 - Words: 36,518 - Reviews: 34 - Favs: 53 - Follows: 64 - Updated: 1/31/2020 - Published: 10/2/2019
A Familiar Force REDUX by Jeggetts4.0 reviews
After defeating the Gene Worm, Adrian Shephard thought it was his fate to be forever sealed in an endless void. However it turns out that someone has an... interest in the events that will take place on a world far away, involving a girl that calls out for a familiar.
Crossover - Half-Life & Familiar of Zero - Rated: T - English - Fantasy/Sci-Fi - Chapters: 2 - Words: 7,912 - Reviews: 27 - Favs: 72 - Follows: 96 - Updated: 12/31/2019 - Published: 1/15/2019 - A. Shephard, Louise
A Tear in The Source Engine by Unforeseen Consequences reviews
First story on here, originally I posted unrevised version of the story on Amino. thought I might spruce it up and put it here. Summary: Gordon and Alyx fuck shit up in Remnant.
Crossover - RWBY & Half-Life - Rated: T - English - Humor/Adventure - Chapters: 2 - Words: 2,687 - Reviews: 6 - Favs: 11 - Follows: 20 - Updated: 11/22/2019 - Published: 10/29/2019 - Gordon F., Alyx V., Team RWBY, Team RNJR
Resistance Effect by Elvenlord2001 reviews
(Title subject to change) Twenty years after the Resonance Cascade, the event is detected by the Council. A ship is sent to investigate. When it is shot down, and survivors land on the planet, they have to survive against the the odds and the Combine until they can escape.
Crossover - Half-Life & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 1 - Words: 4,626 - Reviews: 10 - Favs: 40 - Follows: 70 - Published: 10/31/2019 - OC, Garrus V., Liara T'Soni, Tali'Zorah
Half Life Episode Archie by 9one1ong3nough
In the next chapter of the (nonofficial) Worlds Collide saga, destroying the Borealis in a nuclear explosion wasn't a good idea. Now Gordon Freeman and his newfound friends must traverse different worlds to fix reality and stop any villain who gets in their way. Properties belong to: Valve Capcom SEGA
Crossover - Mega Man & Half-Life - Rated: T - English - Sci-Fi/Adventure - Chapters: 2 - Words: 3,148 - Favs: 2 - Follows: 1 - Updated: 9/10/2019 - Published: 8/28/2019 - Gordon F., Alia, Alyx V., Barney C.
Two Ships by csvolny
What would happen if the Half-Life protagonist were to meet the Portal protagonist? In the broken streets of downtown City 17, this is what happened. Rated T, for violence.
Crossover - Half-Life & Portal - Rated: T - English - Adventure/Hurt/Comfort - Chapters: 1 - Words: 5,315 - Favs: 6 - Follows: 3 - Published: 9/9/2019 - Gordon F., Chell - Complete
Jane & the Stranger by Strange.Imagination reviews
Hopper made a new rule: no using of powers unless necessary. El has never used her spying abilities ever since Hopper established that rune. Apparently, it invades privacy-something that even Mike values. One night, El unintentionally spies on someone she doesn't even know and gets to chat with another person who apparently "spies" as well.
Crossover - Stranger Things, 2016 & Half-Life - Rated: K+ - English - Mystery/Sci-Fi - Chapters: 1 - Words: 1,715 - Reviews: 3 - Favs: 3 - Follows: 2 - Published: 8/17/2019 - Eleven/Jane H., G-Man
Late for work by General secretary
After leaving Ooarai, Mako found employment abroad in a high tech research facility. Unfortunately, she is late for work, what could go wrong?
Crossover - Girls und Panzer/ガールズ&パンツァー & Half-Life - Rated: T - English - Adventure/Sci-Fi - Chapters: 27 - Words: 7,141 - Favs: 3 - Follows: 4 - Updated: 7/12/2019 - Published: 5/20/2019 - Assam, Erwin, Kay, Mako R. - Complete
Subject: Gap by Koishi The Satori reviews
As the uprising within City 17 reaches it's climax, a group of Overwatch soldiers are sent to recover an important prisoner.
Crossover - Half-Life & Touhou Project - Rated: T - English - Sci-Fi/Adventure - Chapters: 10 - Words: 33,869 - Reviews: 14 - Favs: 27 - Follows: 37 - Updated: 5/19/2019 - Published: 8/8/2018 - Complete
High Elf from ESO trailer gets Raped by The Placoderm reviews
Gordon Freeman, an Elder Scrolls Online addict watches the ESO trailers fro the first time and falls in love at the Altmer Spellsword. He goes to Dr. Kleiner for a portal so he can sexually assault her.
Crossover - Half-Life & Elder Scroll series - Rated: M - English - Hurt/Comfort/Crime - Chapters: 1 - Words: 2,657 - Reviews: 1 - Favs: 1 - Follows: 1 - Published: 5/7/2019 - Gordon F., Altmer - Complete
Xen Attacks Episode 1: The Wonderful World by thestevemann123 reviews
In a world where the invasion ended much earlier, Xen would become the mightiest force in all realms. In this episode, the Nihilanth and his forces set their eyes on a certain Wonderful World.
Crossover - Half-Life & KonoSuba: God's Blessing on This Wonderful World - Rated: T - English - Fantasy/Adventure - Chapters: 1 - Words: 252 - Reviews: 1 - Favs: 2 - Follows: 1 - Published: 5/7/2019
Half Life : A Path Divided by discet04 reviews
What if Chell had managed to fight off the party escort bot after her showdown with GLaDOS. Freed from the Enrichment Center to explore the world beyond, for better or worse. "Things have changed since the last time you left the building. What's going on out there will make you wish you were back in here..."
Crossover - Half-Life & Portal - Rated: T - English - Adventure/Hurt/Comfort - Chapters: 5 - Words: 23,529 - Reviews: 15 - Favs: 49 - Follows: 69 - Updated: 4/21/2019 - Published: 1/19/2017 - Alyx V., Chell, D. Rattmann
G&K Experimental Unit: XVL1456 by VentXekart reviews
In the year 2063, Persica and a small group of G&K personnel rediscover an old research facility as well as some information about the projects that were being worked on there. One project in particular would lead to the birth of a new model of T-Doll.
Crossover - Half-Life & Girls' Frontline/少女前线 - Rated: T - English - Sci-Fi - Chapters: 1 - Words: 5,062 - Reviews: 5 - Favs: 15 - Follows: 9 - Published: 1/11/2019 - Complete
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