The Coolsville bank is robbed. The janitor says that he saw a monster in the vault but nobody believes him and he is accused of the robbery. He's proven right when Scooby finds the monster inside his doghouse.

Scooby and Shaggy are at the Coolsville comic book convention where they learn their old friend has been saving the #1 comic book of Commander Cool for them. They find themselves in trouble when one Commander Cool's enemies comes to steal the comic book.