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! The result? Krypton never exploded. The Kents never found a baby in a field. Superman isn't the protector of Metropolis. How can the Man of Steel put back time as it should be? Collects ACTION COMICS #0 and #703, ADVENTURES OF SUPERMAN #0 and #516, SUPERMAN #0 and #93, STEEL #0 and #8, SUPERMAN: MAN OF STEEL #0 and #37 and SUPERBOY #0 and #8.