A 15 episode serial in which Blake battles the "Scorpion" over possession of a 'death ray' machine.
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
