A young girl named Mia discovers a magical bracelet that transports her into the fantastical world of Centopia, a realm populated by elves and unicorns. In this parallel world she takes on a new identity and embarks on quests to protect the unicorns from those who wish to harm them, while navigating ordinary life back in the real world. The story blends live-action sequences in the real world with animated adventures in Centopia.