Alternative versions of Superman establish a new continuity for DC, affecting not only Superman, but all of the DC Comics characters. The versions of Superman from this time period are traditionally divided into three main periods. The first version of Superman began being published by DC Comics in 1938 appearing in "Action Comics" #1. To explain discrepancies in the aging of Superman across several decades, his earliest stories were retroactively portrayed as having taken place on an alternative world called Earth-Two. These stories take place from 1938 until the late 1950s, although the exact dividing line is unclear and some stories happened identically to
Superman: War of the Supermen Superman: War of the Supermen Superman: War of the Supermen is an American comic book limited series from DC Comics that serves as the culmination to the "Superman" line-wide event "". The series began on Free Comic Book Day 2010, with a zero-issue released free of charge before the main limited series began the following week. The whole event is portrayed as a "100 Minute War" in the narrative's time, although the whole event lasted one month in May 2010. No other "Superman" family books were solicited that month other than "Superman/Batman" and "Adventure Comics" neither of which crosses over