Crisis on Infinite Earths #2

"Time and Time Again!" Written by Marv Wolfman. Art by George Perez and Dick Giordano. The story that inspired "Zero Hour" and "Infinite Crisis" continues. In the second chapter of the biggest epic in DCU history, a group of heroes and villains, including the likes of the Golden Age Superman of Earth-2, Firestorm, Green Lantern (John Stewart), Doctor Polaris, Psi-Mon, and more, have been assembled by the enigmatic being known as the Monitor and his partner, the woman simply known as Harbinger. They have been dispatched throughout the multiverse, and time itself, to defend monolithic machines that may halt the advance of the destructive anti-matter wave which is sweeping across the infinite. However, they'll find this a task easier said then done when their enemy's agents, sinister Shadow Demons, rise up to destroy them.