A 15 episode serial in which Blake battles the "Scorpion" over possession of a 'death ray' machine.
Ralph Byrd
as Dr. Jerry Sheehan
Herbert Rawlinson
as Sir James Blake
Joan Barclay
as Hope Mason
Lloyd Hughes
as Dr. Marshall, 'The Scorpion'
Dickie Jones
as Bobby Mason
Lucille Lund
as Duchess
Nick Stuart
as Julot
Sam Flint
as Chief Insp. Henderson
Gail Newbury
as Mimi the Policewoman
Jimmy Aubrey
as The Hag / Baron Polinka
Theodore Lorch
as Daggett, the Butler
George DeNormand
as Henchman Pedro
