Allied agents infiltrate the Nazi rocket complex at Peenemunde in order to obtain their secrets and sabotage the plant. The film alternates between German developments of the V-1 missile and V-2 rocket (with a German cast speaking their own language) and discovery by British Intelligence of the weapon.

• Metro-Goldwyn-Mayer British Studios
• Metro-Goldwyn-Mayer
• Sophia Loren
• George Peppard
• Trevor Howard
• John Mills
• Richard Johnson
• Tom Courtenay
• Jeremy Kemp
• Anthony Quayle