Seattle, Washington is plagued by hissing, steamin’ demons from an underground city, and The Scooby-Doo Detectives set out to solve the mystery. A music store and an old dockside hotel provide clues that leads the gang on a scary chase on underground cable cars. The villain, finally trapped in a barrel is revealed to be none other than Sam Crenshaw, owner of a destruction company harassed by the demons, who planned to rob his own company under the impression of the legendary demons burglarizing his office. After the capture, in a restaurant, Scooby-Doo is frightened by a steaming dish only to discover a giant steamed lobster under the cover.
