After Mr. Diaz fails to scare some kids with his haunted house, Star and Janna summon Hungry Larry, reputed to be a very scary spirit, to haunt the house. Janna goes missing and screams attract the kids back to the house. But the kids get scared and go missing; Star and Marco are attacked. Mr. Diaz arrives to find Hungry Larry has eaten everyone, and rescues them.
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.