Devil's Due published G.I.Joe: Sigma 6 starting in December 2005. Each issue of this six issue limited series featured a self-contained story that focuses on a pair of characters based on the Sigma 6 cartoon television show.
In 2008, Spotlight, a publishing company based in Minnesota, released the 6 issues of Sigma 6 in a reinforced library binding hardcover style. These were then disturbed to libraries. The cover for issue #2 is different then the original.