Freddy is doing a new film edition to the Stinkweed series. He runs into the actor who plays Stinkweed who claims that he's being framed for some strange incidents.

The gang goes along with Scooby to his parents' house. Scooby's parents give him their heirloom, a special collar. Everything seems okay until the ghost of a long dead dogcatcher who was arrested when he tried to steal that collar off of a young Scooby comes to continue what he started years ago.

The doctor tells everybody to just play along with Shaggy's amnesia. So now Shaggy thinks he's Commander Cool. When he finally gets his memory back he doesn't remember what just happened.