Major Cummings
Capt. Chester (as Terence Kilburn)
Serg. Kasper
Dr. Warren
Nurse
Col. Butler
Mayor
Barbara Griselle
Atomic Engineer (as Kerrigan Prescott)
Prof. Walgate
Dr. Bradley
Ben Adams (as R. Meadows White)
Amelia Adams
Const. Gibbons
Melville
Sentry (uncredited)
Minister (uncredited)
Jacques Griselle (uncredited)
Villager (uncredited)
Sergeant in Office (uncredited)
Townsman (uncredited)
Technical Sergeant (uncredited)