Elenco - Blake of Scotland Yard
Ralph Byrd
Dr. Jerry Sheehan
Herbert Rawlinson
Sir James Blake
Joan Barclay
Hope Mason
Lloyd Hughes
Dr. Marshall, 'The Scorpion'
Dickie Jones
Bobby Mason
Lucille Lund
Duchess
Nick Stuart
Julot
Sam Flint
Chief Insp. Henderson
Gail Newbury
Mimi the Policewoman
Jimmy Aubrey
The Hag / Baron Polinka
Theodore Lorch
Daggett, the ButlerGeorge DeNormand
Henchman Pedro
Bob Terry
Henchman PeytonWilliam Farrel
Count Basil SegaloffFrank Wayne
Charles, the Footman