"Halloweentown III: High School Musical" is a 2004 Disney Channel Original Movie that continues the story of Marnie Piper, a young witch from Halloweentown. In this installment, Marnie faces the challenges of high school while trying to balance her magical heritage and her desire to fit in with her peers. The film features a musical element, showcasing various songs performed by the cast. Marnie, along with her friends, must confront a new threat to Halloweentown and work together to protect both their worlds. The movie combines themes of friendship, identity, and the importance of embracing one's true self.