Portal Crossovers
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Is Your Great-Aunt an AI? ! by Quatermass reviews
Petunia sends a baby Harry to her aunt, living in America, Caroline Evans. Some years later, Caroline becomes GLaDOS, and only Harry stops her from her rampage. Now, Harry is eleven, and he's heading to Hogwarts. Of course, with an amoral scientist/computer for a great-aunt and a mute big sister, the question is not whether he is ready for Hogwarts. Is Hogwarts ready for him?
Crossover - Harry Potter & Portal - Rated: T - English - Humor/Fantasy - Chapters: 11 - Words: 28,082 - Reviews: 124 - Favs: 531 - Follows: 679 - Updated: 22h - Published: 10/18/2015 - [Harry P., Hermione G.] GLaDOS, Chell
TOD dr who portal by 1980-somethingspace-girl reviews
Just read.
Crossover - Doctor Who & Portal - Rated: T - English - Sci-Fi/Humor - Chapters: 3 - Words: 715 - Reviews: 4 - Favs: 1 - Follows: 1 - Updated: 2/8 - Published: 1/4/2015
We don't need Portals by BacktotheFanfics
When a modified DeLorean and a lightning bolt get Doc and Marty stuck in a post-apocalyptic America, their only hope of a way home is to investigate a shed. But when that shed hides more than just tools, they discover a whole underground scientific labyrinth, a couple of crazy AIs and the adventure of a lifetime.
Crossover - Back to the Future & Portal - Rated: T - English - Adventure/Friendship - Chapters: 12 - Words: 26,726 - Favs: 1 - Follows: 3 - Updated: 2/7 - Published: 1/30 - Doc/Dr. Emmett Brown, Marty McFly, GLaDOS, Wheatley
What Could Be by FPSCanarussia
A short crossover between Portal and AtLA. Nothing Canon-breaking, just a little plot bunny I had. What if Aperture was suddenly transported to Ba Sing Se? What would change? Not much, apparently. Also, the Announcer annoys everyone.
Crossover - Avatar: Last Airbender & Portal - Rated: K+ - English - Humor - Chapters: 1 - Words: 1,590 - Follows: 2 - Published: 2/6
Digital Hearts by JustAnotherFandomWriter reviews
A chance discovery leads Mettaton to cross paths with a certain robot who's intelligence and elegant beauty rivals his own, causing him to uncover something deep within himself.
Crossover - Portal & Undertale - Rated: T - English - Humor/Romance - Chapters: 2 - Words: 1,236 - Reviews: 3 - Favs: 4 - Follows: 5 - Updated: 2/6 - Published: 1/16
Beyond Science: Pandora's Box by Alexandroid99
This is the start of a crossover that I've long wanted to write and finally got around starting. What you have before yourself is the first attempt at creating a basic setting introducing Doug Rattman as the main protagonist for now and his Companion (Cube). I am still pretty new to writing bigger stories, so do make sure you give me lots of constructive criticism! I hope you enjoy
Crossover - Doctor Who & Portal - Rated: K - English - Chapters: 1 - Words: 1,124 - Published: 2/6
PorTale by IgnisWings reviews
The monsters of the underground live peacefully, before a human salt mine, some abandoned labs, and a murderous computer are discovered. The characters shall test their way out of the abandoned labs. Rated K , due to Portal's rating.
Crossover - Portal & Undertale - Rated: K+ - English - Sci-Fi/Angst - Chapters: 4 - Words: 1,514 - Reviews: 3 - Favs: 7 - Follows: 10 - Updated: 2/6 - Published: 1/29 - Cave Johnson, GLaDOS, Papyrus
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: 55 - Words: 363,434 - Reviews: 74 - Favs: 69 - Follows: 68 - Updated: 1/30 - Published: 2/17/2012 - Dragonborn/Dovahkiin, D. Rattmann, Wheatley, Chell
Portal Secret Santa 2015 by Blueotterkitty reviews
The Crystal Gems encounter a certain Aperture Science personality construct. (Written for drawinggalaxy for Portal Secret Santa 2015.)
Crossover - Portal & Steven Universe - Rated: K - English - Humor/Friendship - Chapters: 1 - Words: 2,342 - Reviews: 4 - Follows: 1 - Published: 1/28 - Space Core, Pearl, Steven U., Peridot - Complete
The Long Road Ahead, and the Parts Behind Me by PixelsShattered
Not really an official story, just a selection of ficlets (if you can even call them that) from the last 2 years set both in both the Pokémon and Portal worlds. Or maybe they're the same. Or maybe not.
Crossover - Pokémon & Portal - Rated: K - English - Chapters: 1 - Words: 1,025 - Favs: 1 - Published: 1/24
The Witch in Aperature by AdamGregory03 reviews
What happens when a certain sexy witch winds up in a facility with a mute woman with a portal gun, a British robot core, and a cynical main computer system operating it all? ...Pretty much the one thing you would expect to ensue: Shenanigans.
Crossover - Portal & Bayonetta - Rated: T - English - Humor/Sci-Fi - Chapters: 1 - Words: 1,088 - Reviews: 1 - Favs: 2 - Follows: 2 - Published: 1/21
Compy: Keeper Of Memory by GingerFloof26 reviews
Fouth installment in the "Compy" series. Compy, formerly known as GLaDOS, and Lucca Ashtear plunge headlong into a conflict with the Combine in an effort to retrieve the Frozen Flame. But the greatest obstacles they face will be from within. Can they surmount their own fears in time to prevent a multidimensional disaster?
Crossover - Chrono Trigger & Portal - Rated: K+ - English - Romance/Sci-Fi - Chapters: 3 - Words: 3,634 - Reviews: 3 - Updated: 1/14 - Published: 11/26/2015
Life in Aperture by roket333 reviews
Cave Jonson has developed inklings and does a 5-day report on them that turns permanent. Inspired by Kingtutgaming's "A week at Aperture Science" fic Yes, I know misspelled Cave Johnson's last name.
Crossover - Portal & Splatoon - Rated: T - English - Humor/Sci-Fi - Chapters: 1 - Words: 778 - Reviews: 1 - Favs: 1 - Published: 1/11
The Things We Do For Science by Kineil D. Wicks reviews
Cooperative testing is supposed to bring people together through science. Cake is often a good motivator, but escaping a madhouse that tries to pass itself off as a science facility works better. Will they escape? Or will the facility keep them clutched in its iron grasp forever?...
Crossover - Portal & Don't Starve - Rated: T - English - Adventure - Chapters: 35 - Words: 24,011 - Reviews: 4 - Favs: 1 - Follows: 3 - Updated: 1/8 - Published: 5/5/2015 - Wilson H., Willow
Into the Fire by cmpmatthews reviews
When the Doctor and Donna land in the Enrichment Center of Aperture Science after 30 years of silence, they decide to explore. Little do they know that they are about to be tested to the max by a lonely, bored AI that had been dormant for 30 years prior.
Crossover - Doctor Who & Portal - Rated: T - English - Sci-Fi/Adventure - Chapters: 5 - Words: 3,264 - Reviews: 10 - Favs: 8 - Follows: 13 - Updated: 1/5 - Published: 11/26/2013 - 10th Doctor, Donna N., GLaDOS, Weighted Companion Cube
Meeting new friends by KittyHawkSG63 reviews
Wheatley is Pulled back into Aperture, then is thrown into a portal with other cores into a very magical land, and I mean Magical
Crossover - My Little Pony & Portal - Rated: K+ - English - Friendship/Adventure - Chapters: 1 - Words: 1,721 - Reviews: 2 - Favs: 2 - Follows: 4 - Published: 1/2 - Twilight Sparkle, OC, Wheatley, OC
Weatley and Space Cores UnBEARable Adventure by thenewjimmyj reviews
When Space Core accidentally bumps into Wheatley he sends themselves back to earth to the humid san fransisco. I will tell more in the story.
Crossover - Portal & We Bare Bears - Rated: K+ - English - Humor/Adventure - Chapters: 3 - Words: 581 - Reviews: 4 - Updated: 12/14/2015 - Published: 11/13/2015
Tendrils by SilencedHearts
Chell and Wheatley discover that something dangerous lies in the woods. Chelley with Core!Wheatley and Mute!Chell. Includes Slenderman. Rating may go up, but T for now.
Crossover - X-overs & Portal - Rated: T - English - Romance/Horror - Chapters: 1 - Words: 272 - Published: 12/11/2015
Worlds Collide by nadiarose1205 reviews
GLADoS gets bored of just testing with Chell, and the robots Atlas and Peabody don't interest her. So being the supercomputer that she is, GLADoS finds Tony Stark in a hidden Apeture Laboratories file, and of course wanting the best, she kidnaps him and places him in a testing chamber. What will happen when the worlds of Iron Man and Portal collide? Who knows. Let the fun begin.
Crossover - Ironman & Portal - Rated: T - English - Adventure/Friendship - Chapters: 3 - Words: 1,491 - Reviews: 1 - Favs: 1 - Follows: 3 - Updated: 12/8/2015 - Published: 5/20/2015 - A. E. Stark/Tony, Chell, GLaDOS, Wheatley
My Little Portal Portals are magic by KittyHawkSG63 reviews
Cave here, Welcome to Aperture Science Innovators, Wonderbolts, Equestrian war heros, and smart ponies, you're here cause we need the best and you are it, and remember, The future starts with YOU!
Crossover - My Little Pony & Portal - Rated: T - English - Suspense/Adventure - Chapters: 1 - Words: 1,140 - Reviews: 1 - Favs: 1 - Published: 12/4/2015 - Twilight Sparkle, OC, Cave Johnson, OC
Finally Human (A Portal Fanfiction) by Morgan64
What would happen if Wheatley and GLaDoS were finally human?
Crossover - Half-Life & Portal - Rated: T - English - Sci-Fi/Mystery - Chapters: 1 - Words: 286 - Published: 12/2/2015
Aperture tag advanced! by loosecat56
Zak and Dr. Beeman wake up in a strange place called Aperture and discover that they have to go through several tests under the surveillance of a female AI. Eventually they bump into a young girl who claims that they are in a video game. Can they escape or be trapped in a faux science facility forever?
Crossover - Portal & Secret Saturdays - Rated: K+ - English - Adventure/Parody - Chapters: 1 - Words: 804 - Published: 11/27/2015 - GLaDOS, Space Core, Zak S.
Compy: Chrono Convergence by GingerFloof26 reviews
The third installment in the "Compy" series. GLaDOS, now known as Compy, sends the Borealis to her old ally, Lucca Ashtear. But when the Combine steal the Frozen Flame of Chronopolis, will it be an opportunity to make amends with her past, or will it doom all their worlds to destruction?
Crossover - Chrono Trigger & Portal - Rated: T - English - Romance/Sci-Fi - Chapters: 17 - Words: 26,454 - Reviews: 9 - Updated: 11/24/2015 - Published: 4/27/2015 - Complete
Horrifying Metal (portal and fnaf crossover) by lex1013
Dem just got a assistant job with Mike at Freddy's. But on Night 5, the paradox begins. Portal is owned by Valve. FNAF is owned by Scott Cawthon. My only ideas were the OC. Originally from my blog dubbed as Skypemare.
Crossover - Portal & Five Nights at Freddy´s - Rated: K - English - Supernatural/Adventure - Chapters: 1 - Words: 1,967 - Published: 11/15/2015
Where Shall We End? by kyatonipunyaanyaa reviews
A mega crossover- Portal, Lego Movie, MLP:FiM, Hetalia, Homestuck, Marvel, and Warriors. ((Marvel was not featured in the first chapter.))
Crossover - My Little Pony & Portal - Rated: T - English - Adventure/Sci-Fi - Chapters: 2 - Words: 940 - Reviews: 2 - Updated: 11/14/2015 - Published: 11/3/2015 - Twilight Sparkle, Fluttershy, Chell, GLaDOS
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