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.
Sophia Loren
as Nora Van Ostamgen
George Peppard
as Lt. John Curtis
Trevor Howard
as Professor Lindemann
John Mills
as General Boyd
Richard Johnson
as Duncan Sandys
Tom Courtenay
as Robert Henshaw
Jeremy Kemp
as Captain Phil Bradley
Anthony Quayle
as Bamford
Lilli Palmer
as Frieda
Paul Henreid
as General Ziemann
Helmut Dantine
as General Linz
Barbara Rütting
as Hannah Reitsch
