| Unofficial Challengers of the Unknown Index |
Credits:
| Story | Bill Finger |
| Art | Bob Brown |
| Lettering | Stan Starkman |
| Editing | Murray Boltinoff |
Feature Character(s):
- Challengers of the Unknown:
- Ace Morgan (also in flashback to World War II, where he is already an Ace)
- Rocky Davis
- Red Ryan
- Prof Haley
Villain(s):
- A giant evil eye (first appearance; created by an alchemist 600 years ago; destroyed)
- A group of fascists (first appearance for all)
Other Character(s):
- Anthony Dragio (first appearance; descendant of the Count that caused the creation of the Evil Eye; cheats the curse of death along with other passengers of an airliner)
- "Death Cheaters" (first appearance for all; unofficial name of group of passengers saved from death by the Challengers)
Location(s):
- Italy
- Dragio Castle (first appearance; also in flashback)
Comment(s):
- The Challengers' new uniforms are slightly redesigned shrinking and moving the Hourglass emblem to over their hearts.
Credits:
| Story | Dave Wood |
| Art | Bob Brown |
| Lettering | Stan Starkman |
| Editing | Murray Boltinoff |
Feature Character(s):
Villain(s):
- Gas Master (first appearance; uses gaseous hallucinogenics to turn Ace evil)
- Zaab (first appearance; the Gas Master's brutish assistant)
Location(s):
- Valley of Death (first appearance; vegetation is killed by the Gas Master)