The last serial produced by Republic Pictures, which made its reputation with serials.
Chapter Titles: 1. Daredevils of the Air 2. Death Takes the Wheel 3. The Trap That Failed
4. Operation Murder 5. The Mechanical Bloodhound 6. Undersea Peril
7. High Hazard 8. Death Alley 9. Cave of Doom
10.The Masked Executioner 11.Undersea Warfare 12.Vengeance Under the Big Tp
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