Roy Ward Baker Director Ralph Bates Dr. Jekyll Actor Martine Beswick Sister Hyde Actor Gerald Sim Professor Robertson Actor Lewis Fiander Howard Actor Susan Brodrick Susan Actor Dorothy Alison Mrs. Spencer Actor Ivor Dean Burke Actor Philip Madoc Byker Actor Neil Wilson Older Policeman Actor Paul Whitsun-Jones Sergeant Danvers Actor Albert Fennell Producer Brian Clemens Producer, Screenwriter David Whitaker Original Music Norman Warwick Cinematographer James Needs Film Editing