I've always dismissed comics taking place in alternate universes or on other Earths. The way I saw it was, if it didn't happen in the "real" world it was a waste of my time. However, DC sent me over the first issue of Earth 2 and it featured that world's version of Batman and Robin. Just like a fish, I took the dangling bait and was reeled in.
"Earth 2 Volume 1: The Gathering" collects issues one through six of the monthly series. In an alternate universe, Batman, Superman, Wonder Woman, and their allies are wiped out in a war with Apokolips. Years pass by as humankind repairs itself. They've grown accustomed to a world without heroes.