David Farrar
— Sexton Blake
Dennis Price
— Dick Warren
Pamela Stirling
— Stella Duncan
Julien Mitchell
— James Duncan (as Julian Mitchell)
Cyril Smith
— P.C. Morgan
Ferdy Mayne
— Paul Dacier
Dennis Arundell
— Phillip Rainsford
Johnnie Schofield
— Purvis
Paul Croft
— Marat
Kynaston Reeves
— Beales
Desmond Roberts
— Cotter
Danny Green
— Carl
Patric Curwen
— Dr. Grey
Tony Arpino
— Fox
Vincent Holman
— Col. Wills
Howard Douglas
— Preston
Billy Howard
— Sergeant Crossby
Anders Timberg
— Wrexham
H Victor Weske
— Otto
Gerald Pring
— Sir Horace Cranston
Noel Dainton
— Van Schuster
Olive Walter
— Housekeeper