Diễn viên
Dirk Bogarde
Charles Prohack
Jon Pertwee
Plover
Frederick Valk
Dr. Viega
Ada Reeve
Mrs. Griggs
Frederick Leister
The Director General
Cecil Parker
Arthur Prohack
Heather Thatcher
Lady Maslam
Bryan Forbes
Tony
Hermione Baddeley
Eve Prohack
Glynis Johns
Mimi Warburton
James Hayter
Carrell Quire
Jerry Verno
Taxi Driver (uncredited)
Ian Carmichael
Hat Salesman (uncredited)
Denholm Elliott
Oswald Morfrey
Judith Furse
Laura Postern
Sheila Sim
Mary Prohack
Russell Waters
Cartwright
Henry Edwards
Sir Digby Bunce