Fics where a character from the canon universe travels to an alternate universe or vice versa. Crossovers and fics set entirely in one alternate universe with no dimension travel are not included.
** = I love it, * = I like it
The Avengers
This Is Not My Beautiful House by AdamantSteve
K, Complete, >7,000
- Clint wakes up after a mission he can't remember with the boyfriend he never thought he'd have.
Fringe
Can't Get Next To You by Yahtzee
T, Complete, Olivia/Peter, >13,000
- Peter Bishop searches for Olivia through multiple parallel universes, adjusting to each new world -- and each new Olivia -- he finds. Set between seasons two and three.
Harry Potter
Alternative Universes community (fanfiction.net stories only)
Alternate dimensions in HP fics by painless-j
A Necessary Gift by Cossette_Aimee
T, WIP, >100,000
- The war drags on after Voldemort's defeat and the Order of the Phoenix are fighting a losing battle. When Harry is hit by yet another killing curse, he wakes up years in the past and in an alternate universe.
As an unknown child in an unfamiliar world, Harry has a chance to change the outcome of the war - while dealing with new magical talents, pureblood politics and Black family drama.
Merlin
Seven Magpies by syllic
MA, Complete, Merlin/Arthur, >33,000
- Arthur opened his eyes a minute later to the sight of seven magpies streaking across the top of the clearing, their shapes dark against the white clouds and the muted grey of the sky. He tried to remember what it was that seven magpies meant—he'd had a nurse who had sung the rhyme to him as a child—but couldn't.
Arthur wakes up somewhere he doesn't recognise, but where he clearly belongs.
* The Wrong Trouser Leg of Time & A Tale of Two Arthurs by kathkin
MA, Complete, Merlin/Arthur, >25,000
- Arthur thinks the space-time continuum is messing with him, but perhaps it's actually making things the way they're meant to be.
Naruto
A World of Truth by luchia
MA, Complete, Sasuke/Naruto & Kakashi/Obito/Rin, >23,000
- The world is trapped in an illusion which removes anger, hate, and death. It's paradise, giving everyone everything they've ever wanted and reviving anyone they've ever lost. Nearly two years into the illusion, Sasuke snaps back to his senses and must decide whether to keep the world in false bliss, or return it to war-torn reality.
Sherlock
Drifting Under Bridges by cleflink
K-M, WIP, >28,000
- The one where John finds himself in an alternate reality where he's an omega, Sherlock is an infuriating mad genius (and an alpha) and all these gender stereotypes are infuriating in the extreme.
Or, that gen omegaverse series. Because what else would you do with a trope that's all about kinky knotting sex but take out the sex?
* Watches 'Verse by bendingsignpost
T-E, WIP, Sarah/John & Sherlock/John, >66,000
- First, he is shot in Afghanistan. Second, he wakes to a phone call in Chelmsford, Essex. Third is pain, fourth is normalcy, fifth is agony and sixth is confusion. By the eighth, he's lost track. (John-centric AU)
Supernatural
Alternate Life by staceycj
K+, Complete, >45,000
- AU: What life could have been like for the Winchesters.
But For the Grace by Kroki Refur
T, Complete, 80,000
- Dean always thought he was prepared for Sam to leave him again, until it actually happened.
The Cancer Inside by purplehrdwonder
No rating (K+), Complete, >6,000, Warning: [physical abuse]
- Dean tangles with a djinn who grants you what you want most, with a wicked sense of what it probably thinks is humor. Dean's pissed at Sam, angry, just wants Sam to shut up and listen and grovel maybe a little bit more because hey, the guy jumpstarted the apocalypse and betrayed Dean. So yeah, Dean wants that. And in this world, Dean gets just that.
Falling Through by entangled_now
MA, Complete, >7,000
- Like his world is wrong in some way, for not having a Sam.
for the world's more full of weeping than you can understand by minviendha
No rating (T), Complete, >3,000
- Somewhere, there is a world where a six-month-old baby died instead of Mary. Somehow, Sam stumbles into it.
Getting to a Place I Never Left by saucyminx
MA, Complete, Sam/Dean, 40,000
- When Dean awakens he’s in another world, a world of no hunting where he’s happy and living with Sam. The problem is – he remembers another life – but which one is real?
Gripped You Tight and Raised You From Biggerson's by sokiah
T, Complete, >24,000
- At the Biggerson's where Dean works, strange things have been happening. It's not long before he realizes they are the fault of his co-worker, Castiel. When Cas confesses he has the ability to manipulate the quantum superposition that Biggerson's inhabits, the two of them are in store for the adventure of a lifetime. Especially when Castiel makes the mistake of taking them too far, and they wind up in a parallel universe, where they must work together with other versions of themselves in order to get home.
* In the Name of the Father by Zanne
T, Complete, Sam/Dean (AU versions), >30,000, Warning: [major character death]
- What happens to John after he makes the deal with the YED?
"Maybe his Demon was playing some sort of joke on him. Maybe it thought this concept of Hell far too perfect for John - a world where his own sons didn't recognize him, demons had all the power, and John was a eunuch of God, backed by something no more substantial than a ghost."
* The Mirror by cloudyjenn
T, Complete, Dean/Castiel & Sam/Castiel, >25,000
- When Dean touches a strange mirror, he's whisked away to one alternate reality after another and it doesn't take him long to realize the universe is trying to tell him something.-Dean/Castiel
Missus a Deo by Kroki Refur
K+, Complete, >4,000
- In October 2008, Mary Winchester opens the door to something that looks like her son but isn't.
Napoleon Is Always Right by kellifer_fic
K-K+, Complete, >3,500
- The first time Dean hears about the man with no dæmon is when he overhears two hunters discussing the best way to kill him.
Permanent State by shannon-doll
M, Complete, Sam/Dean, >21,000
- For eight months, one week, and three days Dean has been trapped in supernatural limbo, living out alternate realities of his own life. He can’t control when the world decides to lurch, has no power over what version of himself comes next and why. Dean’s only concern is to get back to Sam, but time, he realizes, is running out.
Reality Check by NongPradu
T, Incomplete, Sam/Jess, >83,000
- After a bad hunt, Dean wakes up to find that nothing is as it should be. Rubber rooms and padded walls, with no hope of escape, unless he can convince Sam that he's not crazy.
Reality Is Relevant by Dolavine (alternative)
MA, Complete, Sam/Dean, >12,000
- Dean’s thrust into an alternate reality where he’s in an mental hospital. He’s not sure what’s real and what’s not as he slips between realities. His only constant is Sam who guides him and tethers him in both realms as he fights to keep Dean with in the real world.
Song of the Treadmill by tabaqui
No rating, Complete, >20,000
- It doesn't end with a bang, or a whimper. It doesn't end in ice or fire or with some rough beast, eternally slouching toward an impossible Bethlehem. It ends as it began, with a bargain – a deal. Life for life, soul for soul – Sam for Dean forever, Amen.
Swapping by Gillian Middleton (alternative)
K+, Complete, Sam/Dean, >13,000
- Our Sam swaps lives with Sam from an alternate reality, one without ghosts and ghoulies.
To Cross the Universe by Insane Troll Logic
T, Complete, >5,000
- The man Sam finds strung up in the djinn’s lair is not his brother. AU to WiaWSNB.
Will the Real Dean Winchester Please Stand Up by What You See in the Shadows
T, Complete, >32,000
- After being attacked, Dean wakes up in a world where there are no demons and his life has gone in a very different direction. But if he's there, who is the Dean Winchester now living his life? Takes place towards the end of season six.
Teen Wolf
If I Could Turn Back Time by Menacherie
No rating, Complete, Stiles/Derek, >5,000
- Stiles wakes up in a world in which Kate Argent was never born.
Make a Wish by kungfunurse
T, Complete, Stiles/Derek, >15,000, Warning: [graphic depictions of violence, underage]
- "Stiles wished he could fix this, wished so badly that he could make it up to Scott and somehow give him his life back. But Scott’s old life was gone and it was Stiles’ fault." Or the one where Stiles accidentally sparks a wish, Derek has a breakdown and then deals with his man-pain, and no one can get through breakfast without breaking something.
Play It Again by metisket
T, Complete, Stiles/Derek, >63,000, Warning: [graphic depictions of violence]
- In which Stiles goes along with one of Derek’s plans and ends up in an alternate universe as a result. He should’ve known better. He did know better, actually, and that means he has no one to blame but himself.
Something You Give Away by herlovewasajoke
MA, Complete, Stiles/Derek, >27,000
- No good deed goes unpunished.
Where the Inevitable Isn't by Survivah
M, Complete, Stiles/Derek & Allison/Scott & Vernon/Erica, >41,000
- Stiles has a magical thingamajig that's supposed to get him out of danger. Trouble is, it took him really, really far out of danger. Like, to the point where he isn't in the same universe anymore.