While putting up Shaggy's papers for his morning route, Scooby runs into a gr...
A Pup Named Scooby-Doo
Season 1 Episode 2: The Sludge Monster from the Earth's Core
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.