- Robert Cawdron - Saxon
- Robert Raglan - The Captain
- Graham Ashley - Det. Sgt. Jameson
- Frank Thornton - Long
- Richard Shaw - Henchman (uncredited)
- Reginald Marsh - Inspector Martin
- Michael Collins - Fire Chief (uncredited)
- Barrie Ingham - Petrie
- Ann Hanslip - Walter Allen's Secretary
- Ann Hanslip - Betty Fuller
- Margaretta Scott - Mrs. Osborne
- Anton Rodgers - Barman
- Michael Balfour - Harry
- Michael Balfour - Freddy
- Philip Latham - Cooke
- Ballard Berkeley - Harry Tyler
- Ballard Berkeley - Jefford
- Ballard Berkeley - Mansion
- Valentine Dyall - Inspector Kellogg
John Ireland interpreta a John Hunter en la serie.
Robert Ayres hace el papel de Walter Allen.
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