Blake of Scotland Yard
Dr. Jerry Sheehan
Sir James Blake
Hope Mason
Dr. Marshall, 'The Scorpion'
Bobby Mason
Duchess
Julot
Chief Insp. Henderson
Mimi the Policewoman
The Hag / Baron Polinka
Daggett, the Butler
Henchman Pedro
Henchman Peyton
Count Basil Segaloff
Charles, the Footman
