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 character and cast the more mild-mannered Clark Kent that is traditionally associated with the character. Clark is a reporter at the Metropolis newspaper the "Daily Planet", which allows him to keep track of events in which he might be able to help. Fellow reporter Lois Lane is often the object of Clark's affection. Lois's affection for Superman and rejection of Clark is a recurring theme in Superman comics and media adaptations. In the Modern Age comics Superman considers himself Clark Kent first and Superman second. Before the Crisis on Infinite Earths (i.e., DC comics published up to the early 1980s), the attitude was