The grim dimensional prison known as the Phantom Zone holds the worst criminalsknown to the universe, each one as powerful as Kal-El. Now Krypton's Last Son mustenter the Phantom Zone to investigate a deadly jailbreak... but is trouble on thehorizon? As the Aethyr sets his devious plan into motion, Superman must unravelthe true nature of the Phantom Zone before it claims its final inmate!From superstars Mark Waid (Batman/Superman: World's Finest) and Clayton Henry(Batman/Superman) comes the untold tale of one of Superman's most storieddimensions. What is the history of the Phantom Zone, and how can the Man of Steelever escape it again?