Following "Crisis on Infinite Earths" (1985-1986), "The Man of Steel" (1986) modified Superman's backstory so that he no longer had a history as Superboy, and never donned a costume until after he finished college. Because of the importance of Superboy to the history of the Legion of Super-Heroes, the 1987 storyline "The Greatest Hero of Them All" revealed that the Legion's Superboy came from a "pocket universe" created by the Legion foe the Time Trapper, rather than the main DC Universe. This version of Superboy dies after saving his parallel Earth.