| Unofficial Challengers of the Unknown Index |
Credits:
| Art | Bob Brown |
| Lettering | Stan Starkman |
| Associate editing | Murray Boltinoff, George Kashdan |
| Editing | Jack Schiff |
Feature Character(s):
Supporting Character(s):
Villain(s):
- Multi-Man (between issues #15 and #24/2; uses his increased intelligence to mechannically recreates his former powers)
Story Reprinted in:
- Showcase Presents Challengers of the Unknown #2 (2008)
Credits:
| Art | Bob Brown |
| Lettering | Stan Starkman |
| Associate editing | Murray Boltinoff, George Kashdan |
| Editing | Jack Schiff |
Feature Character(s):
- Challengers of the Unknown:
- Ace Morgan (exposed to cosmic rays)
- Prof Haley
- Red Ryan
- Rocky Davis (exposed to cosmic rays)
Supporting Character(s):
Villain(s):
- Several mutated animals (first appearance; exposed to cosmic rays)
Location(s):
- Challengers Mountain
- Africa
Story Reprinted in:
- Showcase Presents Challengers of the Unknown #2 (2008)