Guest Stars Walter Gotell as Receptionist Lionel Murton as Colonel Keller Andrew Downie as Porter Norman Florence as Attendant Hermione Baddeley as Mrs. Grahame Christopher Rhodes as Gunther Klaus Roger Delgado as Von Golling Moira Redmond as Mitzi Jack Cunningham as Driver Reginald Jessup as Cable Car Attendant Uncredited John Bailey as Detective
