| Unofficial Challengers of the Unknown Index |
CHALLENGERS OF THE UNKNOWN #18
Cover Date: February-March 1961
Cover Price: $.10
Publication Date: 1960-12-13
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Cover Credits:
Art: Bob Brown
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Credits:
| Art | Bob Brown |
| Lettering | Stan Starkman |
| Associate editing | Murray Boltinoff, George Kashdan |
| Editing | Jack Schiff |
Feature Character(s):
- Challengers of the Unknown:
- June Robbins (next in issue #19/2)
Supporting Character(s):
- Cosmo (first appearance; a small, raccoon-like creature used as a test animal for space flight by an alien race)
Villain(s):
- Unnamed criminals (first appearance for all; use the island as a staging area for contraband weapons)
Location(s):
- Mystery Island (first appearance; a small island in the Caribbean inherited by June)
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):
Villain(s):
- Lenroy (first appearance; a volunteer that plans on looting an abandoned city)
- Four giant alien creatures (first appearance for all)
Other Character(s):
- Dr. Owen Gough (first appearance; test a time machine and pull the Challengers into the 23rd Century)
Location(s):
- Challengers Mountain
- Earth in an alternate 23rd Century (first appearance)
Story Reprinted in:
- Showcase Presents Challengers of the Unknown #2 (2008)