Dr. Jerry Sheehan
Ralph Byrd
Sir James Blake
Herbert Rawlinson
Daggett, the Butler
Theodore Lorch
Henchman Pedro
George DeNormand
Henchman Peyton
Bob Terry
Count Basil Segaloff
William Farrel
Charles, the Footman
Frank Wayne
Hope Mason
Joan Barclay
Dr. Marshall, 'The Scorpion'
Lloyd Hughes
Bobby Mason
Dickie Jones
Duchess
Lucille Lund
Julot
Nick Stuart
Chief Insp. Henderson
Sam Flint
Mimi the Policewoman
Gail Newbury
The Hag / Baron Polinka
Jimmy Aubrey
Director
Robert F. Hill
Story
Screenplay
William Buchanan
Basil Dickey