Too Close for Comfort (1980)

S2E12 A Fan for Henry

A devoted follower of Henry's Cosmic Cow comic strip, who has been sending increasingly strange letters, sneaks into his apartment one night through the open front door and steals his puppet. In a note, the fan promises to return by the weekend. Believing the message to be a life-threatening ultimatum, Henry and Monroe prepare to keep watch at the apartment with assistance from a police officer. However, their plan takes a turn when the officer receives an urgent call and abandons them, leaving Henry and Monroe to handle the situation on their own.