A 15 episode serial in which Blake battles the "Scorpion" over possession of a 'death ray' machine.
Dr. Jerry Sheehan
Ralph Byrd
Sir James Blake
Herbert Rawlinson
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
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