The Doctor accidentally finds himself in another world once again, this one having particular... tastes when it comes to the appearance of the denizens. Thankfully the Doctor was already regenerating, so no damage done... Right?
Embark on a journey as The Doctor somehow ends up taking on the funniest and most chaotic earth pony in the history of Equestria as his companion!
His name is Time Turner he's not the Doctor
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This is a crossover story. The Doctor (from Doctor Who) regenerates into a pony here. He will end up using the name Time Turner as an alias soon though.