Too Close for Comfort (1980)

S02E14 Charlie's Last Hurrah

Title: Charlie's Final Fling Plot: Henry receives a call from a competing cartoonist known for pulling pranks on him throughout the years. Teaming up with Monroe, Henry devises a scheme to get back at him during a dinner invitation. However, when the rival suddenly asserts he’s on his deathbed, Henry finds himself feeling morally bound to help him execute a complicated plan to deceive his spouse.