Sophia Loren
(Nora Van Ostamgen),
George Peppard
(1st Lt. John Curtis USAAF),
Paul Henreid
(General Ziemann),
Trevor Howard
(Professor Frederick Lindemann),
Tom Courtenay
(Robert Henshaw),
Helmut Dantine
(General Linz),
Maurice Denham
(Air Chief Marshal),
John Fraser
(Flight Lieutenant Kenny Post),
Wolf Frees
(German Police Inspector),
Richard Johnson
(Duncan Sandys),
Jeremy Kemp
(Captain Phil Bradley),
John Mills
(General Boyd),
Lilli Palmer
(Frieda),
Anthony Quayle
(Bamford),
Barbara Rütting
(Hannah Reitsch),
Sylvia Syms
(Flight Officer Constance Babington Smith),
Richard Todd
(Wing Commander Kendall),
Patrick Wymark
(Prime Minister Winston Churchill)