Half-Life Crossovers
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Overwatch Leader Lazlo:The Federation Empire by CoolDudeStar
Crossover of Camp Griffin and Half-Life 2,The GL-Man has accepted Lazlo's request to bring their armies to earth and Camp as well...Rated T-M for Laungage,Guns,Violence and more to come!
Crossover - Half-Life & Camp Lazlo - Rated: T - English - Adventure/Sci-Fi - Chapters: 2 - Words: 3,695 - Updated: 4/24 - Published: 4/23
And a Shepherd to Lead Us by A Very Thirsty Megalomaniac reviews
With the Earth ravaged by Combine negligence and xenian wildlife, the human/vortigaunt combined alliance takes to the stars. Commander Adrian Shepard (descendant of Cpl. Adrian Shephard, whose "H" was a casualty to history and poor spelling) sets to combat the new Reaper threat while shadow forces struggle to determine what humanity's future is going to look like.
Crossover - Half-Life & Mass Effect - Rated: T - English - Sci-Fi/Humor - Chapters: 26 - Words: 127,524 - Reviews: 86 - Favs: 126 - Follows: 139 - Updated: 4/24 - Published: 3/19/2014 - A. Shephard, G-Man, Shepard (F)
Salvation: The Taking of the Carmenta Illustria by Jesse De La Rosa reviews
Salvation - Episode I: After a hard fought battle, a little rest and relaxation seems ages overdue. However the proud crew of the SR-2 Normandy is about to be crudely reminded that there is no rest for the wicked... Follow-up to Salvation
Crossover - Half-Life & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 31 - Words: 214,076 - Reviews: 74 - Favs: 67 - Follows: 72 - Updated: 4/19 - Published: 5/11/2012
Half life: Singularity Collapse by Danger close reviews
William Wilks is many things, a former HECU Corpsmen, a CP , and a hater of the Combine. When the City 17 uprisings start he is ready to join the fight, but when two young women who "aren't from around here" cross paths with him, it will change his life and sent forth something greater then he could have expected.
Crossover - Half-Life & Strike Witches - Rated: T - English - Sci-Fi/Adventure - Chapters: 2 - Words: 3,046 - Reviews: 3 - Favs: 1 - Follows: 1 - Updated: 4/18 - Published: 3/30 - OC, Eila J., Sanya L.
Help from the Admin 2: shackles and binds by GuardianAlpha103
This story was inspired by a picture I found on the internet, I have no idea who drew it. This is what happens if my Gmod character is called to help Hiccup and Toothless who were captured by slavers. This story was written on the fly like the last one so its may not be very good. Once again I am new to this so please review for suggestions a new blood might need.
Crossover - Half-Life & How to Train Your Dragon - Rated: T - English - Supernatural/Hurt/Comfort - Chapters: 1 - Words: 1,330 - Published: 4/12 - OC, Hiccup, Stoick, Toothless
Half Life: Saurian Conflict (ON HOLD) by LegoMan7.62
ON HOLD UNTIL FURTHER NOTICE. While on a usual strike mission to undermine the Combines Chicago operations, 24 year old Resistance Fighter Daniel Williams is taken from his world and is forced to save a planet full of dinos and prevent it from shattering any further. Read and Review, Enjoy.
Crossover - Star Fox & Half-Life - Rated: T - English - Adventure/Sci-Fi - Chapters: 1 - Words: 443 - Favs: 1 - Follows: 1 - Published: 4/6 - Krystal, OC
Help from the Admin by GuardianAlpha103 reviews
This is just a short Oneshot I cobbled together one night about what would happen if I dropped my Garry's Mod character into the battle near the end of HTTYD 2. This is edited to an extent so please don't scream at me about little things (again I cobbled this together). Anyway this has some mild language and a small battle so I hope you enjoy. (SUBJECT FOR CHANGE)
Crossover - Half-Life & How to Train Your Dragon - Rated: T - English - Sci-Fi - Chapters: 1 - Words: 1,137 - Reviews: 1 - Published: 3/27 - Hiccup, Stoick, Toothless, Drago Bludfist - Complete
Initiation by jcdenton2012 reviews
A Salamanders Initiate suddenly finds himself being abducted by a strange and mysterious xeno for some unknown purpose.
Crossover - Half-Life & Warhammer - Rated: T - English - Horror/Sci-Fi - Chapters: 1 - Words: 1,570 - Reviews: 2 - Favs: 4 - Follows: 6 - Published: 3/27
Danny Phantom and Half-life prompt or challenge by ghostboy1225 reviews
a prompt/ challenge i came up with PM me if you make a story and credit me for the prompt Disclaimer: i own neither Danny Phantom or Half-life
Crossover - Half-Life & Danny Phantom - Rated: T - English - Chapters: 1 - Words: 176 - Reviews: 1 - Published: 3/14 - Complete
The World After by Imperator Augustus
GLaDOS realizes that maybe she can't just delete feeling from herself, that she needs that mute lunatic in her artificial life Yeah, it's not actually a crossover, Portal and Half Life are in the same Universe
Crossover - Half-Life & Portal - Rated: T - English - Adventure/Sci-Fi - Chapters: 1 - Words: 787 - Published: 3/9
Dark Designs by Mr. Hybrid
After the end of the Combine Empire and Great Spirit Robot battle, Helryx takes a small group to explore a newly discovered underwater location. Whatever is down there isn't happy to see them and it's discovery changes everything about what was supposed to be a simple exploration mission. (Dead Fic, will be rewritten eventually)
Crossover - Half-Life & Bionicle - Rated: T - English - Adventure/Horror - Chapters: 4 - Words: 3,171 - Updated: 2/23 - Published: 1/27
After Aperture by Shius reviews
After everything she's been through, all the testing, mocking, and fighting with A.I.'s, Chell is finally free from Aperture. But what now? Without any knowledge of the outside world, and the war between humanity and the Combine, how will Chell survive? Follow the story of our favourite mute protagonist as she dives head first into the world of Half-Life, the world beyond Aperture.
Crossover - Portal & Half-Life - Rated: T - English - Adventure/Sci-Fi - Chapters: 12 - Words: 53,139 - Reviews: 46 - Favs: 59 - Follows: 90 - Updated: 2/23 - Published: 7/26/2013 - Alyx V., Gordon F., Chell, D. Rattmann
1920s Portal x Half Life by talietikasero
A 1920s double AU in which Aperture and Black Mesa are rival crime organizations, headed by Caroline and Breen respectively, and a night out turns into something unexpected
Crossover - Half-Life & Portal - Rated: K - English - Chapters: 6 - Words: 17,165 - Favs: 1 - Follows: 1 - Updated: 2/13 - Published: 8/25/2014 - Gordon F., Caroline, Chell
The Spell Gone Wrong by Kokara1352 reviews
A simple spell. That's all Twilight thought it was after finding a strange spell called the "Xen portal" in a spell book somepony left on her doorstep, but something has gone wrong. Something has gone so, so wrong. These monsters, these things, are appearing in Ponyville, attacking and killing anything they can. Now Twilight, must stop these monsters before Equestria is doomed.
Crossover - Half-Life & My Little Pony - Rated: T - English - Sci-Fi/Supernatural - Chapters: 2 - Words: 11,421 - Reviews: 3 - Favs: 1 - Follows: 2 - Updated: 2/2 - Published: 8/16/2013 - Twilight Sparkle, Spike, Flash Sentry
Life Crysis by Romulus98
The world united in its efforts to help the Vortigaunts fleeing Xen as refugees through portals successfully opened at Black Mesa. After forcing the portal to close, the Combine forced it back open. Thus began the war for the survival of the human and Vortigaunt race. Completely and most definitely AU.
Crossover - Half-Life & Crysis - Rated: T - English - Adventure/Sci-Fi - Chapters: 1 - Words: 1,938 - Favs: 2 - Follows: 2 - Published: 1/16 - Eli V., Gordon F., Alcatraz, Laurence Barnes/Prophet
Social Encounter by Weezel Soup reviews
She fought and struggled until she'd gotten out and she's made it through. She even got people that she could call friends, friends that need her to fight with them. It seems manageable because now, she isn't alone. That also makes it much harder. T to be safe and some language
Crossover - Half-Life & Portal - Rated: T - English - Adventure/Friendship - Chapters: 5 - Words: 9,469 - Reviews: 4 - Favs: 6 - Follows: 12 - Updated: 1/6 - Published: 6/28/2012 - Chell
Dark Skies by CentuariAlpha reviews
Book 1 of 3. As ancient powers and enigmatic figures make their move, the stars will darken and the heavens will tremble as a scarred and battered humanity still reeling from the Combine occupation encounters the rest of the civilized galaxy.
Crossover - Half-Life & Mass Effect - Rated: T - English - Chapters: 9 - Words: 39,113 - Reviews: 272 - Favs: 349 - Follows: 445 - Updated: 12/31/2014 - Published: 2/22/2014
A Familiar Force by Jeggetts 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 called Halkegenia.
Crossover - Half-Life & Familiar of Zero - Rated: T - English - Sci-Fi/Fantasy - Chapters: 8 - Words: 65,006 - Reviews: 59 - Favs: 132 - Follows: 147 - Updated: 12/25/2014 - Published: 9/16/2013 - A. Shephard, Louise
Mobius Opposing Forces by LegoMan7.62
My second fanfic and my first crossover idea I've just came up with involving Shepherd from Opposing Force and Sonic Satam, this is for those of you who read ANY half life and sonic fanfictions at all. Please Enjoy, read and Review at your own discretion.
Crossover - Sonic the Hedgehog & Half-Life - Rated: T - English - Adventure/Sci-Fi - Chapters: 2 - Words: 956 - Updated: 12/9/2014 - Published: 11/27/2014 - Sonic, Sally, A. Shephard
Semper Fi by Magnificent Bosh'tet
It's 1957. 90% of humanity is dead or worse. The planet is being frozen by a race of blood-thirsty, mutagenic, aliens. However, they didn't count on a HECU marine showing up.
Crossover - Half-Life & Resistance: Fall of Man - Rated: T - English - Sci-Fi/Horror - Chapters: 2 - Words: 1,228 - Favs: 3 - Follows: 1 - Updated: 12/8/2014 - Published: 11/21/2014 - A. Shephard, G-Man, J. Capelli
Half Dead by Pachy
Takashi,Rei,Saeko y su grupo intentarán sobrevivir a las criaturas alienígenas que llegaron a la tierra,pero no son su única amenaza...Zombies,Insectos Gigantes,Fauna Extraterrestre,pero están en la mira de la "Alianza"...
Crossover - Half-Life & Highschool of the Dead - Rated: T - Spanish - Adventure/Drama - Chapters: 2 - Words: 1,627 - Favs: 1 - Follows: 1 - Updated: 12/6/2014 - Published: 12/5/2014
Portal storms and Chipmunks by billboard018
Through one of Simon's latest inventions, Alvin and the gang find them self in a world struggling to survive in the aftermath of an alien invasion and are facing their biggest challenge yet.
Crossover - Half-Life & Alvin and the chipmunks - Rated: T - English - Sci-Fi/Adventure - Chapters: 2 - Words: 18,528 - Updated: 12/2/2014 - Published: 6/6/2014
MOCII - The Failed Voyage of the Borealis by Lagiacrus reviews
Sequel to 'The Misadventures of Caroline II'. When a Floppy Disk containing a challenge and information about the Borealis comes into GLaDOS' possession, she's willing to cross the sea to find out who dared challenge her. Caroline II is of course dragged along for the ride. But there's more to the Borealis than meets the eye - was its initial disappearance really an accident...?
Crossover - Half-Life & Portal - Rated: T - English - Adventure/Hurt/Comfort - Chapters: 4 - Words: 12,865 - Reviews: 18 - Favs: 12 - Follows: 13 - Updated: 11/3/2014 - Published: 8/8/2014
Universe's Crack by freakytiki34 reviews
Told to writes the fanfictions. Never writes fanfictions before. Here is crossover. Inspired by the works of Hanz Von Hozel. I still don't know what danube means.
Crossover - Half-Life & Firefly - Rated: T - English - Sci-Fi/Humor - Chapters: 1 - Words: 84 - Reviews: 1 - Published: 10/25/2014 - Gordon F., Kaylee - Complete
Non-Unified World Theory by AlmostVortal reviews
The Combine races to uncover the secrets of the Borealis with the Resistance on their tail. Little do either parties know (with the exception of a certain university professor) that the secrets it holds may change both the human world and the fantasy world forever. Two entities whom govern over both worlds must make their moves wisely, or prepare to meet unforeseen consequences.
Crossover - Half-Life & Touhou Project - Rated: T - English - Sci-Fi/Fantasy - Chapters: 1 - Words: 1,780 - Reviews: 2 - Follows: 1 - Published: 10/25/2014 - G-Man, Gordon F., Maribel H., Reimu H.
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