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Issue: Adventures of Superman #649
Feature Characters: Superman (Kal-El), Superman (Kal-L)
Supporting Characters: Batman (Bruce Wayne), Wonder Woman, Powergirl, Justice League Elite
Villains: Lex Luthor, Anti-Monitor, Omac
Guest Appearances: Guy Gardner, Bizarro, Zoom, Polaris, Deathstroke, Black Adam, Sinestro, Psycho Pirate, Cheetah, Paralax, Lois Lane
Other Characters: Max Lord, Hal Jordon, Hawkman, Blue Beetle, Robin (Timothy Drake), Nightwing, Huntress
As each Superman is sent to the other Superman’s world as they fight they attempt to save that world but each fails; with Kal-El failing to fully understand the Earth 2 and Kal-L failing to fully understand the complexity of Earth 1. As their respective world dies they return to their battle; each now aware of the other’s world, and become more determined than ever to stop them from bringing their world into the new reality.
"He will never understand why his world cannot be allowed to survive."