When a medical emergency sidelined Herbert Marshall in May 1951, three of his friends and fellow actors stepped in to record three episodes of Marshall's radio espionage drama The Man Called X. Ken Thurston, the titular agent played by Marshall, was "on sick leave," but the forces of evil were fought by three top-notch talents in his absence. We'll hear Van Heflin in "A Man, a Girl, a Plot" (originally aired on NBC May 25, 1951); John Lund in "Stalin Plus Seven" (originally aired on NBC on June 1, 1951); and Joseph Cotten in "The Casbah" (originally aired on NBC on July 6, 1951).