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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: 1 - Words: 2,676 - Reviews: 5 - Favs: 9 - Follows: 12 - Published: 4/10 - G-Man, Imperial Guard, Inquisition, Planetary Defence Forces
Libera Terra by Johnnieboy11 reviews
When Earth fell in the grip of the Universal Union, mankind had lost hope. Few dared oppose the alien army that won the 7 Hour War and since their crushing victory, Our Benefactors have lived relatively unopposed... Until now.
Crossover - Half-Life & Halo - Rated: M - English - Sci-Fi/Horror - Chapters: 2 - Words: 7,983 - Reviews: 8 - Favs: 21 - Follows: 36 - Updated: 4/10 - Published: 4/8
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: 4 - Favs: 4 - Follows: 8 - Updated: 4/9 - Published: 8/4/2019 - S. Carter, D. Jackson, J. O'Neill
Freeman's odyssey by megacoldfusion reviews
After the events of Half-life episode 2, Gordon is left to wonder what to do next and Doctor Kliner has the answer for him. It will take him to strange new dimensions in meeting interesting people to warn of the Combine threat, the real question remains is he already too late?
Crossover - X-overs & Half-Life - Rated: M - English - Adventure/Sci-Fi - Chapters: 187 - Words: 301,714 - Reviews: 23 - Favs: 41 - Follows: 33 - Updated: 4/8 - Published: 5/5/2013 - Gordon F.
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: 19 - Favs: 24 - Follows: 40 - Updated: 4/5 - 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: 7 - Favs: 25 - Follows: 26 - Published: 3/29
Hired by Sion4Four reviews
After being told he couldn't be a hero, Izuku Midoriya decided to end it all until a strange man offers him a deal he won't refuse.
Crossover - My Hero Academia/僕のヒーローアカデミア & Half-Life - Rated: M - English - Adventure - Chapters: 4 - Words: 3,162 - Reviews: 8 - Favs: 15 - Follows: 15 - Updated: 3/26 - Published: 3/24 - G-Man
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: 5 - Follows: 3 - Updated: 3/12 - Published: 12/2/2015 - GLaDOS, Wheatley
Zootopia 17 by lopezz
Tras un misterioso y extraño incidente en el teletransportador del doctor Keller, Gordon Freeman es enviado a zootopia y una vez dentro de la ciudad, Gordon tendra que arreglarselas para escapar de este extraño lugar de alguna forma por si mismo aun si tuviera que enfrentarse contra toda la ciudad el solo como el primer humano en pisar zootopia
Crossover - Half-Life & Zootopia - Rated: T - Spanish - Adventure - Chapters: 27 - Words: 86,965 - Favs: 1 - Follows: 1 - Published: 2/26
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: 27 - Favs: 39 - Follows: 52 - Updated: 1/31 - Published: 10/2/2019
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: 1 - Words: 4,643 - Reviews: 2 - Favs: 12 - Follows: 15 - Published: 1/8 - OC, Nitori K., Yukari Y., F. n. Mokou
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: 22 - Favs: 63 - Follows: 86 - Updated: 12/31/2019 - Published: 1/15/2019 - A. Shephard, Louise
A Business Deal for a Friend by Prof. Pancakes reviews
Deals are made for the one known as Gordon Freeman, yet the one who accepts such deals is none other than the mysterious man himself. When the time comes to accept a job from a dear "Business Partner", there is none other than the one Freeman to do it.
Crossover - Half-Life & RWBY - Rated: T - English - Humor/Fantasy - Chapters: 17 - Words: 93,942 - Reviews: 84 - Favs: 107 - Follows: 137 - Updated: 12/30/2019 - Published: 11/19/2017 - G-Man, Gordon F., 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: 7 - Words: 15,620 - Reviews: 43 - Favs: 46 - Follows: 64 - Updated: 11/25/2019 - Published: 10/25/2019
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: 7 - Follows: 14 - Updated: 11/22/2019 - Published: 10/29/2019 - Gordon F., Alyx V., Team RWBY, Team RNJR
Freeman's Blessings by Charles From IRS reviews
Free from G-Man's grasp and his name forgotten in time, Gordon sets out in The Borealis expecting death. Instead, he is sent to purgatory and made an offer, save another world and get a reward for it, basically. He can do it, after all, he is The Freeman. WARNING, Dumpster fire of a fanfiction and T for blood, violence and swearing.
Crossover - KonoSuba: God's Blessing on This Wonderful World & Half-Life - Rated: T - English - Adventure/Fantasy - Chapters: 2 - Words: 1,166 - Reviews: 6 - Favs: 8 - Follows: 19 - Updated: 11/3/2019 - Published: 9/22/2019 - Aqua, Kazuma S., Megumin, Gordon F.
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: 8 - Favs: 33 - Follows: 60 - Published: 10/31/2019 - J. Garson, Garrus V., Liara T'Soni, Tali'Zorah
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: 2 - Words: 242 - Updated: 10/27/2019 - Published: 10/19/2019 - G-Man, Gordon F., Caroline, Cave Johnson
HDN: Half-Life (Rewritten) by AntmanGoesUpThanosThanus
In an alternate universe where Freeman fails to travel to Xen because of an alien controller's efforts to stop him. He finds himself in a world similar to Earth. How will our mute protagonist survive in this new world?
Crossover - Half-Life & Hyperdimension Neptunia - Rated: T - English - Adventure/Supernatural - Chapters: 1 - Words: 1,168 - Favs: 5 - Follows: 7 - Published: 10/24/2019
Samantha and Ronin Faces the Grimm Forces of Remnant by RemarkableTreat reviews
Samantha Burrs, a rather unorganized prison shotgunner sergeant, and Ronin Shiyoshi, a loyalist prison specialist, are involved in an accident that causes them to violently teleport to another world while the forces of the Universal Union are trying to get them back.
Crossover - Half-Life & RWBY - Rated: M - English - Adventure/Tragedy - Chapters: 2 - Words: 9,529 - Reviews: 6 - Favs: 6 - Follows: 6 - Updated: 10/12/2019 - Published: 7/9/2019 - OC, The Combine, Team RWBY, Team JNPR
Warhammer 40K: Heralds of Doom by Larry The Mailman reviews
In the grim darkness of the forty-first millenium, there is only war... and war has become much more drastic. Suffering from xenos incursions and attacks from the Ruinous Powers of Chaos, who, or what, could possibly make the Imperium more scared of its position that it is now? :: Rated M due to self-explanatory reasons.
Crossover - Half-Life & Warhammer - Rated: M - English - Sci-Fi/Adventure - Chapters: 2 - Words: 8,048 - Reviews: 2 - Favs: 6 - Follows: 9 - Updated: 10/12/2019 - Published: 4/30/2019
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: 9 - Words: 65,133 - Reviews: 26 - Favs: 64 - Follows: 92 - Updated: 9/11/2019 - Published: 2/2/2019 - A. Shephard, G-Man, Team RWBY, Team JNPR
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: 1 - 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: 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: 2 - Favs: 3 - Follows: 2 - Published: 8/17/2019 - Eleven/Jane H., G-Man
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