
When magical princess Star Butterfly receives a royal magic wand for her 14th birthday, she proves to her parents that she is not ready for the responsibility that comes with it. As a result, they send her to a place that doesn't have magic -- Earth -- in hopes that she will gain maturity. Upon her arrival, Star is given a family to help guide her, so she moves in with the Diaz family, which includes teenage son Marco. Star takes Marco with her as she battles villains -- both in their high school and throughout the universe -- as she attempts to protect her powerful wand.
Star's parents send a fairy godmother named Baby to evaluate Star, who takes the task seriously; Marco borrows Star's Dimensional Scissors to find a place to walk the laser puppies.
Star is called to solve a problem in Miss Skullnick's math class, but she refuses to do it; Pony Head tells Star the bad news that the Bounce Lounge, their favorite partying venue, is closing.
Rhombulus is convinced that Star is the source of a universe-wide magical glitch; Ludo forces Glossaryck to teach him about the Book of Spells.
Ms. Heinous shows up at the Diaz house and Marco must make amends for all the terrible things he has done.