The Justice League of America and the Justice Society of America face a universe-threatening crisis as Earth-One and Earth-Two are pulled toward one another by a mysterious space warp.
While the Spectre uses his incredible magical abilities to prevent the two worlds from colliding, members of both superhero teams find themselves battling familiar enemies across alternate Earths. Green Lantern, Flash, Hawkman, and their allies confront Blockbuster, while Batman, Doctor Fate, Sandman, and Wildcat face Solomon Grundy.
The heroes eventually discover that the crisis is connected to an experimental cosmic-scanning device created by one of Ray Palmer's laboratory assistants. With both Earths in danger, the Atom and the Spectre must combine science and magic to restore the balance between the two universes.
