It was almost a century ago that the great kingdom of Equestria was founded. The brave leaders of the unicorns, pegasi, and earth ponies finally learned to forgo their differences and live in harmony. Starswirl the Bearded has come to the newly-formed land to choose his new apprentice: An earth pony named Astelle. Astelle grew too fond of Starswirl during the time they had together, and ultimately refuses to perform the magical task he wishes her to complete. Astelle vanishes, and in her absense Starswirl has trained a young Celestia in her place. Now Celestia, Luna, and the Mane 6 have to face off against a scorned pony who re-appears in Equestria with an agenda of her own.

Trixie is tired of being the cast-off and the laughing stock of Equestria. When she gets her hooves on a rare spell, she finally has the means to seek her revenge on Princess Twilight. Switching their bodies, Trixie becomes an overbearing royal overlord who wants everything her way. In the meantime, Twilight is stuck in Trixie's body and the Mane 6 have all been scrambled. Twilight and her friends have to find the answers to this puzzling spell before Trixie ruins Equestria for everypony!