George Blair Director Jacques Bergerac Desmond Actor Allison Hayes Justine Actor Marcia Henderson Marcia Blaine Actor Merry Anders Dodie Wilson Actor Joe Patridge Det. Sgt. Dave Kennedy Actor Guy Prescott Dr. Philip Hecht Actor Ferdinand Waldo Demara The Great Impostor Actor Jimmy Lydon Emergency Doctor Actor Gitta Woodfield Screenwriter William Read Woodfield Screenwriter Charles B. Bloch Producer Ben Schwalb Executive Producer Archie R. Dalzell Cinematographer William Austin Film Editing