David Barr
Leslie Banks
June MacKinnon
Carol Goodner
Bassett
Henry Caine
Mr. Lindsey
George Carney
Police Inspector
Jack Lambert
Wages Accountant
John Laurie
Mr. McWilliams
Frederick Piper
Testing Official
Jack Raine
Lord Dean
Frank Vosper
Manning
Alfred Drayton
Hannay
Campbell Gullan
Casey
Percy Parsons
Sir Gregory
Fewlass Llewellyn
Raglan
Henry Oscar
Grierson
Allan Jeayes
Macleod
Donald Calthrop
Director
Michael Powell
Writer
Jerome Jackson
Editor
Geoffrey Barkas
Producer
Art Direction
Alfred Junge
Costume Design
Gordon Conway
Dialogue
L. du Garde Peach
Director of Photography
Leslie Rowson
Sound Recordist
Peter Birch