Collects Superman/Batman #20-25.
*Everything has gone super-batty! Superman and Batman travel to an alternate Earth to kill the man responsible for the death of Lois Lane. And now the mightiest heroes from a world of super-soldiers, hulking monsters and Norse gods have crossed dimensional barriers seeking to avenge their fallen comrade. It's a tale of nonstop action with guest stars from infinite earths, featuring a Bizarro-Superman, a Batzarro, four Supergirls and more Supermen and Batmen then have ever been contained in one book! *Source: Back Cover