I'm My Own Grandpa

An actor plays a relative of their usual character.

The Odd Couple

Appearances

• The Munsters: Season 1, episode 9, "Knock Wood, Here Comes Charlie" (1964). Fred Gwynne plays both Herman Munster and his brother, Charlie.
• The Patty Duke Show: Season 2, episode 18, "The Perfect Hostess" (1965). Patty Duke plays Patty and Cathy's cousin Betsy, who comes to visit from the south.
• The Dick Van Dyke Show: Season 5, episode 7, "The Great Petrie Fortune" (1965). Dick Van Dyke plays both Rob Petrie and his deceased uncle, Hezekiah.
• The Addams Family: Season 2, episodes 2-3, "Morticia's Romance" (1965). Carolyn Jones plays both Morticia Addams and her sister, Ophelia Frump.
• The Odd Couple: Season 1, episodes 22, "What Makes Felix Run" (1971). Felix has a flashback to his childhood in which Tony Randall plays Felix's grandfather.
• The Odd Couple: Season 2, episode 18, "Where's Grandpa?" (1972). Tony Randall plays Felix's grandfather, who comes to stay with Oscar while Felix is on vacation.
• The Odd Couple: Season 4, episode 15, "Cleanliness is Next to Impossible" (1974). Jack Klugman plays Oscar's father in a flashback with his son, Adam Klugman, playing young Oscar.
• The Odd Couple: Season 5, episode 10, "Our Fathers" (1974). Jack Klugman and Tony Randall play Oscar's and Felix's fathers in a flashback story about how they happened to meet in Chicago during prohibition.
• Are You Being Served?: Season 5, episode 3, "Founder's Day" (1977). John Inman plays both Mr. Humphries and his mother.
• Mary Hartman, Mary Hartman: Season 2, episode 182 (1977). Martin Mull, who previously played the late Garth Gimble, returns as Garth's twin brother, Barth.
• Soap: Season 1, episode 20 (1978). Howard Hesseman, who previously played a defense attorney who refused to take Jessica's case, returns as his twin brother, who's prosecuting Jessica's case.
• WKRP in Cincinnati: Season 3, episode 7, "Bah, Humbug" (1980). Gordon Jump plays Mr. Carlson and the ghost of his grandfather.
• WKRP in Cincinnati: Season 4, episode 20, "The Impossible Dream" (1982). Richard Sanders plays Les Nessman and his mother.
• Cheers: Season 2, episode 2, "Little Sister, Don't Cha" (1983). Rhea Perlman plays both Carla and her sister, Annette.
• It's a Living: Season 6, episode 13, "He Never Sang for His Father" (1989). Paul Kreppel plays both Sonny Mann and his father, Irving.
• Seinfeld: Season 7, episode 16, "The Doll" (1996). Jerry Stiller plays Frank Costanza and his Italian cousin from Tuscany, Giuseppe.
• The Simpsons: Season 2, episode 15, "Oh Brother, Where Art Thou?" (1991). Harry Shearer plays Dr. Hibbert and Dr. Hibbert's long lost twin brother, who is the director of the orphanage where Homer is looking for his long lost brother.
• The Simpsons: Season 4, episode 2, "A Streetcar Named Marge" (1992). Jon Lovitz plays twin siblings Llewellyn and Ms. Sinclair.
• Arrested Development: Season 1, episode 20, "Whistler's Mother" (2004). Jeffrey Tambor plays both George Bluth and his twin brother, Oscar.
• Toast of London: Season 3, episode 5, "Man of Sex" (2015). Harry Peacock plays both Ray Purchase and his brother, Bill.