A 15 episode serial in which Blake battles the "Scorpion" over possession of a 'death ray' machine.
| Actor | Role |
|---|---|
 Ralph ByrdDr. Jerry Sheehan | Dr. Jerry Sheehan |
 Herbert RawlinsonSir James Blake | Sir James Blake |
 Joan BarclayHope Mason | Hope Mason |
 Lloyd HughesDr. Marshall, 'The Scorpion' | Dr. Marshall, 'The Scorpion' |
 Dickie JonesBobby Mason | Bobby Mason |
 Lucille LundDuchess | Duchess |
 Nick StuartJulot | Julot |
 Sam FlintChief Insp. Henderson | Chief Insp. Henderson |
| GGail NewburyMimi the Policewoman | Mimi the Policewoman |
 Jimmy AubreyThe Hag / Baron Polinka | The Hag / Baron Polinka |
 Theodore LorchDaggett, the Butler | Daggett, the Butler |
| GGeorge DeNormandHenchman Pedro | Henchman Pedro |
 Bob TerryHenchman Peyton | Henchman Peyton |
| WWilliam FarrelCount Basil Segaloff | Count Basil Segaloff |
| FFrank WayneCharles, the Footman | Charles, the Footman |