James Garner as Major Jefferson F. Pike

Eva Marie Saint as Anna Hedler

Rod Taylor as Major Walter Gerber

Werner Peters as Otto Schack

John Banner as Ernst

Russell Thorson as Gen. Allison

Alan Napier as Col. Peter MacLean

Oscar Beregi Jr. as Lt. Col. Ostermann

Ed Gilbert as Capt. Abbott

Sig Ruman as German Guard

Celia Lovsky as Elsa

Karl Held as Cpl. Kenter

Martin Kosleck as Kraatz

Marjorie Bennett as Charwoman

Henry Rowland as German Soldier

Joe Di Reda as American Soldier

Joseph Mell as Lemke

Richard Alexander as Man Paying Respects (uncredited)

Dick Cherney as German Soldier (uncredited)

John Dennis as MP Sergeant Guard (uncredited)

James Doohan as Bishop (uncredited)

Horst Ebersberg as Swiss Officer (uncredited)

John Hart as Lt. Cmdr. Perkins (uncredited)

Walter Janovitz as Dr. Metzler (uncredited)

Norbert Schiller as Dr. Wittelbach (uncredited)

William Smith as Guy (uncredited)

Rudy Germane as Military Officer (uncredited)

Stuart Hall as Military Officer (uncredited)