The story features Superman and the post-Infinite Crisis version of the Legion of Super-Heroes, uniting them with the team's post-Zero Hour and "Threeboot" counterparts to battle the Time Trapper and a new incarnation of the Legion of Super-Villains (led by Superboy-Prime). This series is the finale of DC's three year reinvention of the Legion, coming after the "Lightning Saga" story arc from the Justice League of America and Justice Society of America series, and the "Superman and the Legion of Super-Heroes" story arc from Action Comics.