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
George Peppard
Trevor Howard
John Mills
Richard Johnson
Tom Courtenay
Jeremy Kemp
Anthony Quayle
Lilli Palmer
Paul Henreid
Helmut Dantine
Barbara Rütting
Richard Todd
Sylvia Syms
John Fraser
Maurice Denham
Patrick Wymark
Wolf Frees
Moray Watson
Richard Wattis
Allan Cuthbertson
Karl Stepanek
William Mervyn
Milo Sperber
George Mikell
Ferdy Mayne
Robert Brown
Anton Diffring
Philip Madoc
John Abineri
Charles Lloyd Pack
Gertan Klauber
Jeremy Spenser
John Ronane