Jack Benny appears as the mystery guest on What’s My Line? John Daly is the host and the panelists are Steve Allen, Hal Block, Arlene Francis, and Dorothy Kilgallen. (Benny’s segment begins at 17:02.) This episode was telecast live by CBS on February 8, 1953:
(This is the latest in a series of arts- and history-related videos that appear in this space each Monday, Wednesday, and Friday)