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art: Brian Bolland, Howard Chaykin

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art: Howard Chaykin, Kyle Baker

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art: Howard Chaykin, Jack Kirby

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art: Arthur Adams, Matt Hollingsworth

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art: Jack Kirby, Matt Hollingsworth

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Jack Kirby created the group Challengers of the Unknown for DC Comics.The story circles around four adventurers who explore paranormal occurences, facing fantastic villains. Writers of the series included the brothers Dick & Dave Wood.