Half-Life Crossovers
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The Mass Life Effect by nunouno1
With the Reaper threat imminent, Commander Shepard makes a desperate bargain with a mysterious man in order to save the entire universe. 20 years later Gordon Freeman awakes to find himself in a whole new world and universe that he had never expected, and now the question must be asked. What threat is the galaxy's true enemy, the Reapers or the mysterious Combine?
Crossover - Half-Life & Mass Effect - Rated: T - English - Drama/Horror - Chapters: 1 - Words: 3,877 - Published: 7h
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: 7 - Words: 21,002 - Favs: 1 - Follows: 1 - Updated: 7/30 - Published: 8/25/2014 - Gordon F., Caroline, Chell
Are You Okay? by NVA Commander Taney-Chan
Alisa watched as the soldier's body peeled off the ceiling, leaving a near perfect imprint with cracks. She winced as the soldier hit the ground, although she was sure his flak vest should muffle any damage done to him. She approached the man, grabbed his discarded assault rifle and kneeled. Alisa extended her right hand and tilted her head to the left. "Are you okay?"
Crossover - Tekken & Half-Life - Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 1,321 - Published: 7/19 - Alisa B. - Complete
The Freeman Odyssey: Connections by Elizabethia reviews
What if, on the way to the Borealis, the helicopter crashes? What if they get captured? Will they get to the Borealis before it's too late? What secrets will they discover? Find out in Connections. This is a hl2 continuation and is much better than the summary. It is also my first story, so please don't flame. Rated T because its tf2; however, some chapters may be rated M.
Crossover - Half-Life & Team Fortress 2 - Rated: T - English - Drama/Humor - Chapters: 16 - Words: 30,970 - Reviews: 4 - Favs: 3 - Follows: 3 - Updated: 7/18 - Published: 5/6 - Alyx V., Gordon F., OC
Right Woman, Wrong Place by du911 reviews
Rise and Shine Miss Universe! Rise and Shine! Not that I'm implying that you've been sleeping on the job. No one's more deserving of rest than you. But your son awaits...
Crossover - Half-Life & Steven Universe - Rated: T - English - Supernatural/Sci-Fi - Chapters: 2 - Words: 1,070 - Reviews: 3 - Favs: 1 - Follows: 3 - Updated: 7/10 - Published: 6/28 - G-Man, Rose Quartz, Steven U.
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: 9 - Words: 77,497 - Reviews: 71 - Favs: 142 - Follows: 160 - Updated: 6/22 - Published: 9/16/2013 - A. Shephard, Louise
Dalek combine war by agentl3
Daleks invade Combine Earth and the combine and the humans must fight back
Crossover - Doctor Who & Half-Life - Rated: T - English - Sci-Fi - Chapters: 2 - Words: 1,067 - Updated: 6/10 - Published: 6/8 - Daleks, W. Breen
General by Star Shimer reviews
This is the story of Aperture Science Laboratories Head of Security. Or, as he would later be known, General. Portal(one and two) X Half-life. Contains Android(ish) OC.
Crossover - Half-Life & Portal - Rated: T - English - Sci-Fi - Chapters: 1 - Words: 740 - Reviews: 1 - Published: 5/18 - G-Man, OC, GLaDOS
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: 10 - Words: 46,220 - Reviews: 317 - Favs: 387 - Follows: 482 - Updated: 5/15 - Published: 2/22/2014
Half-Life The Convergence by deathwing17 reviews
A Council funded expedition into a previously unexplored system has gone horribly wrong. Now the expedition team find themselves stranded on a hostile world and hunted by a ruthless enemy. They soon join forces with a group of rebels hell-bent on freeing their home world and stopping a threat that could destroy all of galactic civilization. A threat known only as the Combine.
Crossover - Half-Life & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 7 - Words: 36,844 - Reviews: 51 - Favs: 91 - Follows: 117 - Updated: 5/15 - Published: 9/12/2013 - A. Shephard, Alyx V., Gordon F., Liara T'Soni
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: 27 - Words: 132,578 - Reviews: 93 - Favs: 131 - Follows: 149 - Updated: 4/29 - 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: 75 - Favs: 68 - Follows: 77 - 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: 2 - Follows: 2 - 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 by LegoMan7.62
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: 486 - Favs: 1 - Follows: 3 - 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: 5 - Follows: 8 - 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 - Favs: 3 - Follows: 2 - 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: 50 - Favs: 67 - Follows: 102 - Updated: 2/23 - Published: 7/26/2013 - Alyx V., Gordon F., Chell, D. Rattmann
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: 2 - Follows: 3 - 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: 3 - Follows: 4 - 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: 11 - Updated: 1/6 - Published: 6/28/2012 - Chell
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
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