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