Time is collapsing in on itself. The villainous Extant has ushered in a series of black holes that are swallowing the universe—past, present and future! Superman, like everyone else in the DC Universe, has seen time loops affect his life. The result? Krypton never exploded. The Kents never found a baby Kal-El in a field. Superman isn''t the protector of Metropolis. Then, after the crisis in time has been averted, new details about the origins of Superman, Superboy and Steel are revealed...