Star tries to fix Marco's arm with magic but accidentally turns it into a giant tentacle. The Diazes are visited by their former exchange student Gustav, and Star becomes jealous.
After having skirmished with a number of dangerous monsters, Star Butterfly arrives on Earth to live with the Diaz family. However, rather than living a normal life, Star continues on having to battle villains both throughout the universe and in their high school, although if only to protect her extremely powerful wand, an object which she is still confused with.