Challengers of the Unknown (vol. 1) #69 (Aug.-Sep. 1969):
“The Secret of Skull Mountain”
by Denny O'Neil, Jack Sparling

Challengers of the Unknown (vol. 1) #69

Title: “The Secret of Skull Mountain”

Medium: comic

Cover date: Aug.-Sep. 1969

Publisher:

Written by: Denny O'Neil
Art by: Jack Sparling

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