Star Butterfly is the princess of a kingdom in another dimension named Miouni. She was sent to Earth after accidentally destroying her home with her new magic wand, which she has not yet mastered very well. Arriving in the Diaz family, she makes a new best friend named Marco. The two heroes will then try to have a normal life, and at the same time, to fight the evil Ludo across dimensions so that Star's wand does not fall into his hands.