The Challengers of the Unknown is a fictional group of adventurers appearing in comic books published by DC Comics. The quartet of adventurers explored paranormal occurrences while facing several fantastic menaces. The characters' provenance is uncertain. 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. Following the end of the Challengers comic, DC has revived the characters in different incarnations over the years. 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. Publication history 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. 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). Kirby moved on after issue #8 (July 1959), with Bob Brown succeeding him as artist. The title continued through issue #75 (September 1970), followed by two reprint issues. The series was canceled with issue #77 in 1971 (January 1971). In 1973, three reprint issues were published (#78–80). Revivals The Challengers had a short-lived 1976–77 revival in Super-Team Family #8–10. The group then returned to its own title continuing the number with #81. During this period, they were joined by Deadman and Swamp Thing, and June Robbins got a uniform and official status. No explanation was given for Corinna Stark's departure, nor June's joining the team. The revived series was canceled with issue #87 in 1978. Adventure Comics Digest #493–497 (1982) featured an expanded version of the team's origin. The Challengers returned in a limited series, Challengers of the Unknown (vol. 2) (1991), by writer Jeph Loeb and artist Tim Sale. It ran eight issues and was reprinted in trade paperback as Challengers of the Unknown Must Die! (2004). This series depicted the Challengers in middle age, breaking up after a tragic accident and coming back together as a team. Loeb hoped for a monthly title, and planned at least a second limited series, but neither volume materialized. In 2000, DC published a one-shot, Silver