Troy, the popular captain of the basketball team, and Gabriella, the brainy and beautiful member of the academic club, break all the rules of East High society when they secretly audition for the leads in the school's musical. As they reach for the stars and follow their dreams, everyone learns about acceptance, teamwork, and being yourself.

Marnie Piper prepares to begin a new school year, she asks the Halloweentown Hot Witches' Council to work toward openness between Halloweentown and the mortal world. She proposes to bring a group of Halloweentown students to her own high school in the mortal world.