| Unofficial Challengers of the Unknown Index |
Credits:
| Story | Arnold Drake |
| Art | Bob Brown |
| Lettering | Stan Starkman |
| Editing | Murray Boltinoff |
Feature Character(s):
- Challengers of the Unknown
- Ace Morgan (also in flashback to an air battle ten years ago)
- Rocky Davis
- Prof Haley
Villain(s):
- Taputoca (first appearance; emperor of a hidden Mexican city)
- Tino Manarry
Location(s):
- Challengers Sub-Sea Base
- Southern Mexican jungles