After an unsuccessful fishing trip, Scooby and the gang lose their way driving through the swamp. They stop to ask directions from someone standing on the side of the road. But when the man puts his lantern closer to his face, they see what he really is: a zombie. Later, they find a general store. The proprietor tells them that he and his friend had seen a witch bring the zombie back from the dead. The gang has a new mystery to solve. They'll find voodoo dolls, an airboat, a boat pull with a metal tip, and a derelict riverboat before their fishing trip brings them a bigger catch than they could have imagined.