Calificación
Reparto

Marshall Thompson
Major Jeff Cummings

Kynaston Reeves
Prof. R. E. Walgate

Kim Parker
Barbara Griselle

Stanley Maxted
Col. Butler

Terry Kilburn
Capt. Al Chester

James Dyrenforth
Mayor Hawkins

Robert MacKenzie
Const. Howard Gibbons

Peter Madden
Dr. Bradley

Gil Winfield
Dr. Warren

Michael Balfour
Sgt. Kasper

Launce Maraschal
Melville

Meadows White
Ben Adams

E. Kerrigan Prescott
Atomic Engineer

Lala Lloyd
Amelia Adams

Shane Cordell
Nurse

Sheldon Allan
Sentry (uncredited)