Patricia Neal
Susan North
Acting
Helmut Dantine
The Stranger
Acting
Derek Bond
Arthur Walker
Acting
Cyril Luckham
Dr. Meinard
Acting
Willoughby Gray
Tom Harding
Acting
Marigold Russell
Gretchen Harding
Acting
Arthur Young
Scientist
Acting
Kenneth Edwards
Charles Dixon
Acting
David Garth
First Police Officer
Acting
Stanley Van Beers
General
Acting
Nigel Green
Second Police Officer
Acting
Graham Stuart
Police Chief
Acting
John Le Mesurier
Official
Acting
Peter Sallis
Soldier
Acting