Peter Graves

as Chris Cronyn

Andrea King

as Linda Cronyn

Herbert Berghof

as Franz Calder

Marvin Miller

as Arjenian

Orley Lindgren

as Stewart Cronyn

Walter Sande

as Admiral Bill Carey

Willis Bouchey

as President

Morris Ankrum

as Secretary of Defense Sparks

George Blagoi

as Russian Official (uncredited)

Bayard Veiller

as Roger Cronyn

Tom Keene

as Maj. Gen. George Burdette

Colin Kenny

as Mine Owner

House Peters Jr.

as Dr. Boulting - Mitchell's Assistant