Michael Anderson	...	(Director)
Duilio Coletti, Vittoriano Petrilli	...	(Writer)
Sophia Loren	...	Nora
George Peppard	...	Lt. John Curtis
Trevor Howard	...	Professor Lindemann
John Mills	...	General Boyd
Richard Johnson	...	Duncan Sandys
Tom Courtenay	...	Robert Henshaw
Jeremy Kemp	...	Phil Bradley
Anthony Quayle	...	Bamford
Lilli Palmer	...	Frieda
Paul Henreid	...	General Ziemann
Helmut Dantine	...	General Linz
Barbara Rütting	...	Hannah Reitsch (as Barbara Rueting)
Richard Todd	...	Wing Cmdr. Kendall
Sylvia Syms	...	Constance Babington Smith
John Fraser	...	Flight Lt. Kenny
Maurice Denham	...	RAF Officer
Patrick Wymark	...	Prime Minister Winston Churchill
Wolf Frees	...	German Police Inspector
Moray Watson	...	Col. Kenneth Post
Richard Wattis	...	Sir Charles Sims
Allan Cuthbertson	...	German Technical Examiner
Karel Stepanek	...	Prof. Hoffer
William Mervyn	...
Milo Sperber	...	German Hotel Porter
George Mikell	...
Ferdy Mayne	...	German Officer at rocket plant
Robert Brown	...	Air Commodore
Basil Dignam	...	British Army Officer (scenes deleted)
Gordon Jackson	...	R.A.F. Pilot (scenes deleted)
John Le Mesurier	...	British Army Officer (scenes deleted)
Erwin Hillier	...	Cinematographer
Ernest Walter	...	Film Editor
J.B. Smith	...	Sound Department
Allan Sones	...	Sound Department
Gerry Turner	...	Sound Department
A.W. Watkins	...	Sound Department
Ron Goodwin	...	Composer
Elliot Scott	...	Art Director
George Blackler	...	Makeup Artist
Basil Rayburn	...	Assistant Director
Stuart Black	...	second assistant director

Summary: This is the story of the methods used to defeat Hitler's V1 (doodlebug) and V2 (rocket) "revenge weapons" towards the end of the second world war. Even though the Nazis were in retreat these weapons could have turned their defeat into victory. The film includes references to Hannah Reich, who in real life was a test pilot and really did fly some of the first 'flying bombs'.