The Munsters (1964)

S2E8 Lily’s Star Boarder

Herman's jealousy reaches new heights when Lily invites Chester, an enigmatic boarder, into their home as part of her latest money-making venture. Convinced that Chester is a criminal after snooping through his belongings, Herman believes he has uncovered evidence that links him to gang activity. In reality, Chester is not a thug at all, but rather a lieutenant with the police department.