My Little Pony: Equestria Girls (2013)

Via a magic mirror, Twilight Sparkle travels into an alternate universe in order to recover a crown that was stolen from the Crystal Empire. Upon her arrival she is horrified to learn that she has turned into a human.

Director: Jayson Thiessen
Writers: Meghan McCarthy, Lauren Faust (television series: "My Little Pony: Friendship is Magic")
Stars: Tara Strong, Ashleigh Ball, Andrea Libman