Superman: Zero Hour

Plot

Collects Adventures of Superman #0, #516, Superman #93, #0, Superman: The Man of Steel #0, #37, Superman in Action Comics #0, #703, Steel #0, #8 and Superboy #8, #0.

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?