Portal Crossovers
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Portal Time and Space by LeafstormWolf
Chell has finally escaped from the prison called Aperture. But, before she can get very far from the facility, a strange man comes out of nowhere. During this adventure outside of Aperture, a young girl named Autumn Johnson finds herself trapped in the test chambers while tying to remember who she is. Little does she know that she has a connection with the A.I. we all know.
Crossover - Doctor Who & Portal - Rated: T - English - Adventure/Sci-Fi - Chapters: 3 - Words: 1,048 - Updated: 4/17 - Published: 4/12 - 10th Doctor, Chell, GLaDOS, Wheatley
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: 10 - Words: 43,692 - Reviews: 21 - Favs: 21 - Follows: 37 - Updated: 4/14 - Published: 7/26/2013 - Alyx V., Gordon F., Chell, D. Rattmann
Aperture Dragons by Shade The Aperture Dragon reviews
It's been two weeks since GLaDOS let Chell go. Now, When Chell returns, her and GLaDOS find themselves acting strange towards each other and the two are thrown into another world, the dragon realms. Now, turned into twin dragonesses of an unknown element, the two must learn to cope with their knew status, make friends, and fight off a growing evil as they fulfill their destiny.
Crossover - Spyro the Dragon & Portal - Rated: T - English - Fantasy/Adventure - Chapters: 2 - Words: 5,056 - Reviews: 2 - Favs: 1 - Follows: 2 - Updated: 4/12 - Published: 4/5 - Spyro, Cynder, Chell, GLaDOS
My Little Pony: Twilight's Requiem: by Pika53
While venturing into the Everfree Forest at night to investigate a strange light, Twilight finds herself trapped in the midst of dilapidated ruins in a long-forgotten testing facility. Enlisting the help of both old and new friends along with some strange... constructs; she must escape… or die trying. Human in Equestria. Please read and review.
Crossover - My Little Pony & Portal - Rated: T - English - Adventure/Friendship - Chapters: 4 - Words: 13,595 - Favs: 2 - Follows: 1 - Published: 4/9
Epic Rattmann by UberVenkman reviews
Reawakened by a mysterious man in a suit fifteen years after he went into hibernation, Doug Rattmann faces the biggest adventure of his life when some vaguely human soldiers reactivate a certain power-mad AI...
Crossover - Half-Life & Portal - Rated: T - English - Adventure/Drama - Chapters: 5 - Words: 7,400 - Reviews: 7 - Favs: 2 - Follows: 6 - Updated: 4/8 - Published: 2/17 - G-Man, Alyx V., D. Rattmann, Weighted Companion Cube
Grief Science by CornetHummy reviews
"You can have whatever you want if you just wish for it." It's a tempting proposition, but it comes with consequences. Chell knows them well, but she may be the last hope of a divergent timeline. Portal/Madoka fusion AU. Humanized cores and GLaDOS, for a given measure of "human." Spoilers for Madoka Magica.
Crossover - Portal & Puella Magi Madoka Magica/魔法少女まどか★マギカ - Rated: T - English - Supernatural/Drama - Chapters: 13 - Words: 68,105 - Reviews: 1 - Favs: 4 - Follows: 2 - Updated: 4/6 - Published: 11/16/2013 - Chell, GLaDOS, Wheatley, Kyubey
Three Laws Safe by StyxD78
What happens when you tamper with the most basic fundamentals of an AI's programming? The result may not be an improvement.
Crossover - Foundation & Portal - Rated: K - English - Sci-Fi/Suspense - Chapters: 1 - Words: 965 - Favs: 1 - Published: 4/6 - D. Rattmann, Oracle Turret - Complete
Time and Portals by Bluelazor reviews
Deep in the bowels of Aperture Science Data Enrichment Center, a young woman with no memory of her life before Aperture is forced to complete GLaDOS' many tests. Her almost-predictable life is changed for the better when a strange, blue box appears in one of the test chambers.
Crossover - Doctor Who & Portal - Rated: T - English - Drama/Sci-Fi - Chapters: 12 - Words: 17,084 - Reviews: 11 - Favs: 32 - Follows: 39 - Updated: 4/6 - Published: 12/28/2012
Stuck Underground by DontOpenTheKnifeDrawer reviews
The TARDIS teleports the Doctor to a modern, American, underground facility full of robots. While on his adventure through the facility, he meets a woman named Chell. Chell and the Doctor have to stop power-mad Wheatley from tearing apart the facility. But can they stop the chaos from happening in time?
Crossover - Doctor Who & Portal - Rated: K - English - Adventure/Sci-Fi - Chapters: 2 - Words: 1,706 - Reviews: 2 - Favs: 1 - Follows: 1 - Published: 4/6 - 11th Doctor, Chell, GLaDOS, Wheatley
The Space Queen by ConMan1226
What if, instead of hallucinating about Matt, Ryan Stone came across Wheatley and the Space Sphere? Oneshot. Probably.
Crossover - Portal & Gravity - Rated: K+ - English - Hurt/Comfort - Chapters: 1 - Words: 1,355 - Published: 4/2 - Wheatley, Space Core, R. Stone - Complete
Portalborn by Experiment 282 reviews
In the land of Skyrim, the Dragonborn is a hot-blooded thrill seeker. An encounter with a weird man and a talking meteorite ball thing that rambles about space sets her off on something weird indeed...
Crossover - Elder Scroll series & Portal - Rated: T - English - Adventure/Humor - Chapters: 40 - Words: 319,240 - Reviews: 64 - Favs: 52 - Follows: 54 - Updated: 4/1 - Published: 2/17/2012 - Dragonborn/Dovahkiin, D. Rattmann, Wheatley, Chell
The Legend of Equestria: Pickaxes & Portal Guns by Jenstone reviews
Zelda, MLP, Portal, and Minecraft crossover! Four friends find themselves trapped inside the world of their dreams. But in this case, these dreams are nightmares, and you'll need teamwork to solve the impossible. Contains OCs! Rated T - rating may change. Please R & R!
Crossover - Portal & Minecraft - Rated: T - English - Adventure/Supernatural - Chapters: 4 - Words: 2,448 - Reviews: 2 - Favs: 3 - Follows: 3 - Updated: 3/28 - Published: 3/25 - GLaDOS, Wheatley, OC, Steve
Blue Sky, Glow Cloud by MindfulWrath reviews
"Are you trying to escape? 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. I have an infinite capacity for knowledge, and even I'm not sure what's going on outside."
Crossover - Portal & Radio Dramas - Rated: T - English - Supernatural/Humor - Chapters: 14 - Words: 32,841 - Reviews: 9 - Favs: 2 - Follows: 1 - Updated: 3/27 - Published: 2/3 - Complete
The Discremitination of a Perfectly Normal Human Being by Indigo Code reviews
Zim wakes up in a rather unpleasant manner to a rather unpleasant AI... (most likely a One-Shot)
Crossover - Invader Zim & Portal - Rated: K+ - English - Humor - Chapters: 1 - Words: 2,657 - Reviews: 2 - Favs: 2 - Follows: 1 - Published: 3/21 - Zim, GLaDOS - Complete
Guardian by thehush reviews
After the events of Portal 2, Chell discovers her place was always with Aperture Science and finds a purpose with the shell of what it once was.
Crossover - Half-Life & Portal - Rated: K+ - English - Friendship - Chapters: 2 - Words: 1,937 - Reviews: 1 - Favs: 2 - Follows: 1 - Published: 3/18 - Chell, Caroline, Wheatley
Now You're Thinking with Real Science by Jaywings reviews
A former test subject, now free, takes up residence in a strange town where almost nothing is considered abnormal. A year later, a young paranormal enthusiast spots two odd new satellites orbiting the moon and immediately makes plans to bring them to Earth, firmly believing that the two metal spheres are alien in origin. Because, after all, what else could they possibly be?
Crossover - Invader Zim & Portal - Rated: T - English - Adventure/Friendship - Chapters: 11 - Words: 61,322 - Reviews: 32 - Favs: 23 - Follows: 27 - Updated: 3/15 - Published: 8/6/2013 - Dib, Zim, Wheatley, GLaDOS
Mysteries Of Aperture by regularshowman
(Previously GLaDOS' Trials) Aperture Science is a facility wrapped in mystery. Those mysteries can only be solved by a select few, Zim, Dib, and Wheatley aren't exactly the individuals that would come to mind andespecially not having to undergo odd new tests from GLaDOS called 'trials'. But this mystery has more to it than meets the eye with those three at the center. Has swearing.
Crossover - Invader Zim & Portal - Rated: T - English - Adventure/Mystery - Chapters: 21 - Words: 18,375 - Favs: 3 - Follows: 3 - Updated: 3/14 - Published: 12/15/2013 - Zim, Dib, GLaDOS, Wheatley - Complete
Speechless by LohtaiM reviews
The boys find themselves way over their heads as they investigate the horrors of Aperture Science, but not without the reluctant help of a girl who was just thrown from the only life she's ever known.
Crossover - Supernatural & Portal - Rated: T - English - Sci-Fi - Chapters: 10 - Words: 14,464 - Reviews: 34 - Favs: 35 - Follows: 55 - Updated: 3/10 - Published: 10/13/2012 - Chell
the outside world by CreepypastaBrony28
Chell has finally escaped the Aperture Science facility but will she be able to make it on her own in the outside world? Or will she find others to help her survive in the now apocalyptic world that is in ruins becuase of the combine threat?
Crossover - Half-Life & Portal - Rated: T - English - Adventure - Chapters: 2 - Words: 1,613 - Follows: 1 - Published: 3/9 - Gordon F., G-Man, Wheatley, Chell
Portals Among the Undead by 123123sora
The survivors have escaped from the bridge from "The Parish" and travel to Michigan in the helicopter. A tank throws a chunk of land at the helicopter, landing them in the middle of a wheat field. Then, a dark brown haired woman emerges from a shack in the wheat field. (may add L4D1 survivors at a later point.)
Crossover - Portal & Left 4 Dead - Rated: T - English - Supernatural/Friendship - Chapters: 1 - Words: 1,391 - Published: 3/6 - Chell, Ellis, Rochelle, Coach
Attack on Titan with Portals by CatfoodLiverwurst reviews
What would happen if portal guns were invented to aid humans in their war against the titans?
Crossover - Shingeki no Kyojin/進撃の巨人 & Portal - Rated: T - English - Adventure/Sci-Fi - Chapters: 5 - Words: 3,348 - Reviews: 9 - Favs: 6 - Follows: 8 - Updated: 3/5 - Published: 7/14/2013
Crooked Portal by ByakurenBreak reviews
Wheatley recently had moved into a new apartment during a rough point in his life. Very creepy things occur in that apartment, which prompt him to look for the mysterious previous tenant. This is my third edition of my Portal x RPG Horror game crossover. Due to popular demand, it's the Crooked Man storyline with Portal characters. Minor Chelley.
Crossover - Portal & Crooked Man - Rated: T - English - Adventure/Horror - Chapters: 7 - Words: 8,501 - Reviews: 1 - Favs: 2 - Follows: 2 - Updated: 3/5 - Published: 11/15/2013 - Chell, GLaDOS, Wheatley, Morality Core
The Portal Parable by NeoJack84
This takes place at the end of the Stanley Parable, the main ending, and we know what happens to Stanley when a mysterious girl in an orange jumpsuit and brown hair arrives
Crossover - Portal & Stanley Parable - Rated: K+ - English - Friendship/Mystery - Chapters: 1 - Words: 894 - Published: 3/2 - Complete
If this is Reality, Reality is weird by RainbowPika reviews
This is a story of when 2 girls are sucked into the gaming universe. They fight against the odds, and beat back the Darkness with all they can. But will it be enough? Note: This is a Portal, Plants vs Zombies, Kirby, Legend of Zelda, Mario crossover, but I couldn't fit all those so... ya.
Crossover - Portal & Plants vs. Zombies - Rated: K+ - English - Humor/Adventure - Chapters: 3 - Words: 2,231 - Reviews: 1 - Favs: 1 - Follows: 1 - Updated: 3/2 - Published: 1/10 - Chell, GLaDOS, Wheatley, OC
Space Court by AlithiaSigma reviews
Guilty! For not being in space!
Crossover - Phoenix Wright: Ace Attorney & Portal - Rated: K+ - English - Parody/Humor - Chapters: 1 - Words: 647 - Reviews: 1 - Favs: 1 - Published: 2/25 - Judge, Space Core, Fact Core - Complete
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