Mildred Hubble may be the clumsiest witch at Miss Cackle's Academy, but as a senior student she's been assigned the important task of lighting lanterns and candelabras each evening. Inspired by this responsibility, Mildred tries to stay out of trouble. But there are many opportunities for mayhem when a wish on a star leads to a lovable stray pup who, unlike Mildred's timid tabby, loves to fly on a broomstick. Can Mildred keep Star a secret and avoid setting fire to the school despite an impending talent competition, the disapproving Miss Hardbroom, and her ever-spiteful classmate Ethel Hallow?