Mysterious occurrences at the Whirlen Merlin Magic Academy send Scooby and his friends on a mission to make sure that Daphne’s sister Melissa, who’s enrolled at the school, isn’t in any danger. The whole gang comes along to try to sort out the situation. Even though they specialize in investigating spooky situations, reports that a dragon has been spotted in the neighborhood have everyone on edge — especially Scooby.