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John Gregson
Inspector Parnell

Alec Clunes
Anthony Chester

Robert Shaw
Marlowe

Helen Cherry
Robbie

Betty McDowall
Maggie Parnell

William Hartnell
Freddie Maddox

Harry Fowler
Smiley

Alan Wheatley
Assistant Commissioner Bewley

Kenneth Cope
Sergeant Grey

Ernest Clark
Police Doctor

Noel Howlett
Brain Specialist

Renée Houston
Masie Maddox

Piers Bishop
Jonathan Chester

Frank Hawkins
Mr. Tamplin

Ray Smith
Mr. Briggs

Christopher Ellis
Christopher Parnell