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
Francis Durbridge
Original Series Creator
A.R. Rawlinson
Screenplay
Ernest G. Roy
Producer
Wilfred Burns
Music
Gerald Gibbs
Director of Photography
Joseph Sterling
Editor
Bernard Robinson
Art Direction
Betty Lee
Hairdresser
John O'Gorman
Makeup Artist
E.S. Laurie
Production Manager
Pat Kelly
Assistant Director
Buddy Booth
Third Assistant Director
W. H. Lindop
Sound Recordist
Harry Raynham
Sound
Noel Rowland
Camera Operator
Peter Lamb
Clapper Loader
Olive Swinney
Wardrobe Assistant
Wilfred Burns
Conductor
Marjorie Owens
Continuity