Answer
Frasier, a popular sitcom, featured Patrick Macnee in a 2001 episode titled "The Show Must Go Off." Macnee, known for his iconic role as John Steed in The Avengers, portrayed the character of Nigel Hawthorne, an elderly actor who becomes a guest star on Frasier's radio show. The episode showcases Macnee's comedic timing and his ability to bring a charming and eccentric character to life.