A mysterious box in a Manhattan alley begins emanating a strange light. The light breaks free from the box, and spreads throughout the world. Anyone tagged by one of its shafts disappears, only to reappear in a parallel universe. Spider-Man gets struck by a shaft and ends up in DC's Gotham City, where he meets the villainous Joker. Likewise, Juggernaut finds himself transported to DC's Metropolis, where he arouses the ire of Superman. Both worlds struggle to understand these paranormal occurrences, but life continues. Heroes and villains adjust to their new surroundings and engage new enemies in battle. Reporter Clark Kent discusses these strange events with his new photographer, Ben Reilly, but both men conclude that its something only a higher power can understand. They turn out to be wrong, as neither the Spectre nor the Living Tribunal comprehend the disturbances throughout the fabric of their respective universes. Elsewhere, two unknown cosmic beings reach out to each other across the void between realities.