Major Jeff Cummings

Marshall Thompson

Acting

Prof. R. E. Walgate

Kynaston Reeves

Acting

Barbara Griselle

Kim Parker

Acting

Col. Butler

Stanley Maxted

Acting

Capt. Al Chester

Terry Kilburn

Acting

Mayor Hawkins

James Dyrenforth

Acting

Const. Howard Gibbons

Robert MacKenzie

Acting

Dr. Bradley

Peter Madden

Acting

Dr. Warren

Gil Winfield

Acting

Sgt. Kasper

Michael Balfour

Acting

Melville

Launce Maraschal

Acting

Ben Adams

Meadows White

Acting

Atomic Engineer

E. Kerrigan Prescott

Acting

Amelia Adams

Lala Lloyd

Acting

Nurse

Shane Cordell

Acting

Sentry (uncredited)

Sheldon Allan

Acting

Minister (uncredited)

Alexander Archdale

Acting

Jacques Griselle (uncredited)

Eddie Boyce

Acting

Villager (uncredited)

Victor Hagan

Acting

Villager (uncredited)

Victor Harrington

Acting

Sergeant in Office (uncredited)

Jack Hetherington

Acting

Townsman (uncredited)

Richard Neller

Acting

Technical Sergeant (uncredited)

Tom Watson

Acting