Velma's Aunt Thelma summons the Scooby-Doo Detective Agency. She's head of the Marine Institute, and their dolphins are disappearing. The scary Headless Skateboarder and the frightening Seaweed Monster are just two of the culprits the gang pursues as they unravel the mystery.
Did You Know?
When Daphne and Velma are examining Al's trophies, Velma's lips are moving, but Daphne's voice is heard reading the inscription. See more