Petergeist is episode 26 of family guy season 04. It was originally aired on May 7, 2006.
After Joe builds a new home theater system, Peter tries to top it by building a multiplex in his backyard and discovers an Indian burial ground. But when he takes an Indian chief’s skull, the house becomes haunted and Stewie pulls a “Carol Anne” and gets sucked into the television. Unfortunately for the Griffins, getting Stewie back from the poltergeist is just the beginning.