Robert Beatty
Dr. Mark Benton
Elizabeth Sellars
Della Freeman
Peter Coke
Det. Insp. George Bellamy
Hugh Kelly
Dr. Craig
Vida Hope
Jackie Leroy
Janet Butler
Sister Rogers
Ferdy Mayne
Charles Constance
James Raglan
Supt. Grayson
Hugh Pryse
Mr. Rattray
George Benson
Prescott
Roger Delgado
Felix Galegos
Frank Atkinson
Railway Ticket Clerk (uncredited)
Donald Conlon
Helios Restaurant Patron (uncredited)
Arthur Dibbs
Helios Restaurant Patron (uncredited)
Robert Gregory
Man at Northolt Airport (uncredited)
Jean Hardwicke
Sister (uncredited)
Barry Johns
Hospital Orderly (uncredited)
Anthony Lang
Johnny (uncredited)
Ronald Leigh-Hunt
Sgt. Lewis (uncredited)
Richard Neller
Hospital Visitor (uncredited)
Harold Sanderson
Hospital Visitor (uncredited)
Marc Sheldon
Waiter (uncredited)
Toke Townley
Fred Barker (uncredited)
Martyn C. Webster
Director
A.R. Rawlinson
Screenplay
Francis Durbridge
Original Series Creator
Gerald Gibbs
Director of Photography
John O'Gorman
Makeup Artist
Ernest G. Roy
Producer
Wilfred Burns
Music
E.S. Laurie
Production Manager
Bernard Robinson
Art Direction
Marjorie Owens
Continuity
Joseph Sterling
Editor
Betty Lee
Hairdresser
Harry Raynham
Sound
W. H. Lindop
Sound Recordist
Wilfred Burns
Conductor
Peter Lamb
Clapper Loader
Olive Swinney
Wardrobe Assistant
Noel Rowland
Camera Operator
Buddy Booth
Third Assistant Director
Pat Kelly
Assistant Director