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 end; the first such story was in "Superman" #17 (July–August 1942). This was common plot in comic book stories prior to the 1970s. In a story in "Action Comics" #484 (June 1978), Clark Kent admits to Lois that he is Superman, and they marry. This was the first story in which Superman and Lois marry that wasn't an "imaginary tale." Many Superman stories since then have depicted Superman and Lois as a married couple, but about as many depict them in the classic love triangle. Another major supporting character is Jimmy Olsen. He is a young photographer at the "Daily