In 1964, Kellerman played Judith Bellero, the manipulative and ruthless wife of Richard Bellero (played by Martin Landau), in an episode of "The Outer Limits" titled "The Bellero Shield". A role as Holly Mitchell, perverted mistress of George Peppard's character in the film "The Third Day" (1965), followed. She played leading lady to David Niven in his television series "The Rogues" in 1965 for an episode titled "God Bless You, G. Carter Huntington" which revolved around her striking beauty to a large degree, and appeared in a 1965 "Alfred Hitchcock Hour" episode titled "Thou Still Unravished Bride."