Guest Stars Patricia Medina as Mrs. Corot Heidi Vaughn as Marie Fenlon George Voskovec as Niles Co Starring William H. Burton Jr. as Harker Bob Orrison as Kalish Bert Kramer as Boyle Nicholas Cortland as Gilbert Douglas Paul Mantee as Frank Viola Gregory Morton as Prof. Brooks Fenlon Len Wayland as Chief Wedlow Tom Stewart as Dr. Norman Wellesley Patty Elder as Barbara Uncredited Jack Clinton as Agent Steven Benson as Waiter
