The series continued in the bimonthly Showcase for three more appearances (#7, 11–12, April 1957, December 1957 – February 1958) then moved to its own title, starting with issue #1 (May 1958). The adventuring quartet the Challengers of the Unknown debuted in Showcase #6 (February 1957), in an uncredited story attributed to Jack Kirby for art and to Kirby and Dick Wood for script, under editor Jack Schiff. Publication history Showcase #6 (February 1957), the first appearance of the Challengers of the Unknown art by penciler Jack Kirby and unknown inker. Some have claimed that Kirby reworked the basic concept of the series with Stan Lee in 1961 to create The Fantastic Four, the first creation that marked the rise of Marvel Comics. Following the end of the Challengers comic, DC has revived the characters in different incarnations over the years. Various sources credit the group as the sole creation of artist and storyteller Jack Kirby, a co-creation with writer Dave Wood or a co-creation with Kirby's former partner Joe Simon. The quartet of adventurers explored paranormal occurrences while facing several fantastic menaces. The Challengers of the Unknown is a fictional group of adventurers appearing in comic books published by DC Comics. Jack Kirby (possibly with Joe Simon or Dave Wood) Challengers of the Unknown #1 (1958), cover art by Jack Kirby.
