Despite the work of Adams and O'Neil, Green Lantern sales had been in a major decline at the time Green Arrow was brought on as co-star, and their stories failed to revive the sales figures.[9] Green Lantern was canceled with issue #89 (April/May 1972), and the climactic story arc of the Green Lantern/Green Arrow series was published as a back-up feature in The Flash #217 through #219. In sharp contrast to the socially relevant tales which preceded it, this story centered on emotional themes, with Green Arrow struggling to deal with the guilt of having killed a man.[9] Green Lantern continued to appear in backup stories of Flash from 1972 until the Green Lantern title was resumed in 1976.