On a dark and stormy night, the Scooby-Doo gang finds themselves in an abandoned mansion, where strange apparitions have frightened the local residents. Fred, Velma, Daphne, Shaggy and Scooby-Doo are determined to solve the mystery. They begin to investigate, each using their unique skills: Fred devises a plan, Velma analyzes the clues, Daphne searches for traps and Shaggy, along with Scooby, tries to avoid the ghosts. As they explore the dusty rooms, they find a series of clues that lead them to discover that the real “ghost” is, in fact, an old resident of the mansion who wants to protect his lost treasure. Together, they reveal the truth and restore peace to the city, proving once again that friendship and courage are the best weapons against fear.
