Roy Barcroft regarded "Captain Mephisto" in this non-western serial as his favorite role.
Chapter Titles:
- 1. Secret Weapon
- 2. Satan's Web
- 3. The Murder Machine
- 4. The Lethal Chamber
- 5. Mephisto's Mantrap
- 6. Ocean Tomb
- 7. The Death Drop
- 8. Bombs Away
- 9. The Fatal Flood
- 10.The Sable Shroud
- 11.Satan's Shadow
- 12.Cauldron of Cremation
- 13.Bridge to Eternity
- 14.Power Dive to Doom
- 15.Fatal Transformation