The Addams Family

Hollister is an undercover operative who's been picking up odd radio signals from the Addams house. Convinced they're spies, he recruits the postman, Briggs, to help. Briggs panics when he gets in the house, though, and flees. Hollister then tries the plumber, Conkey, who's been called in to fix Kitty's water fountain. When Conkey acts suspiciously, Gomez calls the authorities ending up with Hollister. Morticia is convinced that Hollister is a spy, so they capture him and toss him in the dungeon. He sees that the source of the odd signals is Pugsley's new ham radio. Washington vouches for Hollister, so the Family allow him to go.