Challengers of the Unknown
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Sales Rank #141 See Top 2,500
First Issue #1 - April 1958
Last #87 - July 1978
Continued in Challengers of the Unknown (1991 series)
Challengers of the Unknown is another Jack Kirby comic book creation. The challengers are four daredevil adventurers, each of whom survived a terrible accident and who consider themselves living on borrowed time. First appeared in Showcase #6, 7, 11 and 12.