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.
This is Republic Pictures' thirty-sixth serial produced, of a total of sixty-six, and the first released in 1945.
Three of the serial's cliffhanger gags or set pieces were copied in Indiana Jones and the Temple of Doom (1984).
Chapter: 10, is a budget-saving recap episode where sequences from previous chapters are shown for most of the running time.