When her new crown is stolen from the Crystal Empire, Princess Twilight Sparkle pursues the thief, Sunset Shimmer, in an alternate world, where she finds herself turned into ... a girl! To regain her crown and return to Equestrian, Twilight must learn to fit in in this strange new world and defeat Sunset Shimmer in a competition to be crowned princess of the Fall Formal at Canterlot High. Luckily, she has the assistance of Spike and five girls who remind her of a certain group of ponies back home.