Cast
Dr. Jerry Sheehan
Sir James Blake
Hope Mason
Dr. Marshall - «The Scorpion»
Bobby Mason
Duchess [Chs. 1-6, 14]
Julot [Chs. 2-4, 9-10, 14]
Chief Insp. Henderson
Mimi - Policewoman [Chs. 2-4, 9-11]
The Hag / Baron Polinka
Daggett - the Butler
Pedro - Henchman [Chs. 1-7, 14]
Peyton - HenchmanCount Basil Segaloff Charles - the Footman 
Nicky - Henchman
Newsboy, not listed in creditsCafe Waiter [Chs. 1-3, 10, 14], not listed in credits 
Adolph - Henchman, not listed in credits
Landlord and League Representive [Chs. 11-13], not listed in creditsScotland Yard Detective [Chs. 5, 7, 11-13], not listed in credits 
Sgt. Dickens [Chs. 6, 8, 11-12], not listed in credits
Peace Delegate [Chs. 1 & 11], not listed in credits
Adm. Blandon [Chs. 1 & 11], not listed in creditsHenchman, not listed in credits 
