Chapter Titles: 1. The Fatal Fog 2. Perilous Trail 3. Rolling Fury 4. Flight of the Spy King 5. Trapped Underground 6. Wheels of Disaster 7. Electrocution 8. Death Rings the Phone 9. Tomb of Terror 10. Death Dive 11. Desperate Mission 12. Day of Reckoning
The "Wilhelm Scream" can be heard in the final chapter.
In Chapter: 6, the scene of the car hurling off the cliff was taken from The Crimson Ghost (1946), Chapter: 1.
Chapter: 10, "Death Dive", is a budget-saving recap episode where sequences from previous chapters are shown for most of the running time.
Body count: 7