Chapter titles:
1. Silent Terror
2. Lure of the Unattainable
3. A Leap for Liberty
4. The Undercurrent
5. In Mid-Air
6. Fighting Blood
7. The Lion's Claws
8. Lair of the Beast
9. A Voice from the Dead; or, Voice from the Past
10. Hearts of Steel
11. The Burning Span
12. Overboard
13. New Enemies
14. The Fugitives
15. Hell's Riders
In France, this serial was shortened to 12 episodes.