Cast
Patricia Neal
Susan North
Cyril Luckham
Dr. Meinard
Helmut Dantine
The Stranger
Arthur Young
Scientist
Stanley Van Beers
General
Nigel Green
Second Police Officer
Derek Bond
Arthur Walker
Willoughby Gray
Tom Harding
Kenneth Edwards
Charles Dixon
Jack Gwillim
Representative of Parliament (uncredited)
Hugh Moxey
Secretary of the Interior (uncredited)
John Le Mesurier
Official/Man at Desk (uncredited)
Peter Sallis
Soldier (uncredited)