Inspector Parnell
John Gregson
Anthony Chester
Alec Clunes
Brain Specialist
Noel Howlett
Masie Maddox
Renée Houston
Jonathan Chester
Piers Bishop
Mr. Tamplin
Frank Hawkins
Mr. Briggs
Ray Smith
Christopher Parnell
Christopher Ellis
Sgt. Henry
John Dunbar
Desk Sergeant
Edward Rees
Robert Hunter
Constable Jackson
Anthony Ashdown
Marlowe
Robert Shaw
Inspector
Alan Curtis
Robbie
Helen Cherry
Maggie Parnell
Betty McDowall
Freddie Maddox
William Hartnell
Smiley
Harry Fowler
Assistant Commissioner Bewley
Alan Wheatley
Sergeant Grey
Kenneth Cope
Police Doctor
Ernest Clark
Director
Lance Comfort
Screenplay
James Kelley
Art Direction
Jack Shampan
Director of Photography
Basil Emmott
Original Story
Peter Miller
Makeup Artist
Peter Armston
Producer
Tom Blakeley
Editor
John Trumper
Original Music Composer
Bernie Fenton