Appearing in "Menace of the Ancient Vials!"
- Amos Hunter (an archaeologist) (Single appearance)
- Karnak (foreign theif) (Single appearance)
- Brommer (foreign theif) (Only appearance; dies)
- Gortz (foreign theif) (Only appearance; dies)
- Chet Hollister (a sheriff) (Single appearance)
- Doctor Rodney (Single appearance)
- Challengers' Plane
Synopsis for "Menace of the Ancient Vials!"
While chasing the criminal known as Karnak, the Challengers and their prey end up flying into a strong lightning storm, forcing both parties to land. Karnak finds a manor owned by an archeologist who had just discovered the ancient vials of a long dead society, each vial able to unleash a different magical effect. Karnak and his companion steal the vails and use them to battle the Challengers.
The Challengers are able to fight off all the effects of the differn vials, from fighting Karnak as a giant, a giant fire creature, a giant octopus, and an army of Karnak duplicates. Learning that the Karnak duplicates, the Challengers use this fact to find the real Karnak, who tries to use the last vial which turned out to be an antidote to the duplicate vial.
- This issue is reprinted in Challengers of the Unknown Archives, Volume 1 and Showcase Presents: Challengers of the Unknown, Volume 1.
- This issue is divided into four chapters:
- The Menace of the Ancient Vials!
- The Fire Being!
- The Demon from the Depths
- The Deadly Duplicators
- A two-paged Professor Eureka strip is in this issue.
- No trivia.
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- Cover gallery for the Showcase series