Star Butterfly is a magical princess from the dimension of Mewni. Marco Diaz of Earth is her best friend, who does his best to keep up with the magical Star. Together at Echo Creek Academy, the friends deal with everyday school life while keeping Star's magic wand out of the hands of Ludo, a villain from Mewni who has an army of monsters at his command. Join Star in her battle against the forces of evil. But be warned, things may get a little weird!