Scooby-Doo! Mystery Incorporated Season 1 Episode 23

Something is going on in Fred's house. His father has been the victim of a reluctant poltergeist, who seems to want him out of the house. When the gang steps in to solve this mystery, they find out that Mayor Jones is in possession of a piece of the mysterious puzzle that Scooby and the gang found in Darrow Manor. Could the poltergeist be after it?