"The world of Watchmen collides with the DC Universe in a story that rewrites the past, present, and future of comics! Dr. Manhattan, a near-omnipotent being from the Watchmen universe, has been using his powers to rewrite the DC Universe-reshaping some heroes' histories, erasing other heroes altogether, and playing with the fates of the good and evil alike. But why? What does a godlike being from another world stand to gain from the DC Universe? The mystery remains, but now that our heroes know they're being toyed with, what can they do to stop it? The clock is ticking...

Originally published in single magazine form in Doomsday Clock 1-12.