cast
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David Farrar
Sexton Blake
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Dennis Price
Dick Warren
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Pamela Stirling
Stella Duncan
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Julien Mitchell
James Duncan (as Julian Mitchell)
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Cyril Smith
P.C. Morgan
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Ferdy Mayne
Paul Dacier
- Dennis Arundell Phillip Rainsford
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Johnnie Schofield
Purvis
- Paul Croft Marat
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Kynaston Reeves
Beales
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Desmond Roberts
Cotter
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Danny Green
Carl
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Patric Curwen
Dr. Grey
- Tony Arpino Fox
- Vincent Holman Col. Wills
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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