 An early eighth season episode, _Mole People, The (1956)_ (qv),  featured a cameo by Robert Smith, who was Running Back for the  Minnesota Vikings at the time. Playing a mute caveman hunk, he was  the shows first celebrity guest. Film critic Leonard Maltin (qv),  the shows only other celebrity guest, appeared in the ninth season  episode _Gorgo (1961)_ (qv) as himself.