Arthur Crabtree Director Marshall Thompson Major Cummings Actor Kim Parker Barbara Griselle Actor Terry Kilburn Capt. Al Chester Actor Michael Balfour Sgt. Kasper Actor Gil Winfield Dr. Warren Actor Shane Cordell Nurse Actor Stanley Maxted Col. Butler Actor James Dyrenforth Mayor Actor E. Kerrigan Prescott Atomic Engineer Actor Kynaston Reeves Professor R.E. Walgate Actor Peter Madden Dr. Bradley Actor Robert MacKenzie Constable Gibbons Actor John Croydon Producer