Publication history of Superman written by Alan Moore with art by Curt Swan. Although the new Modern Age version of Superman is said to have already been active for many years, most previous Superman appearances and elements were rendered out of continuity by John Byrne's "The Man of Steel". Later stories such as "" bring many of the Silver Age elements back into continuity. In Byrne's version, Superman came from the planet Krypton which was re-imagined as a cold, sterile world in deep contrast to the wonderworld of the past 48 years. Once Kal-El's rocketship (containing genetic materials and a birthing-matrix which resulted in
Superman Planet", who is friends with both Superman and Clark Kent, though in most stories he doesn't know that Clark is Superman. Jimmy is frequently described as "Superman's pal", and was conceived to give young male readers a relatable characters through which they could fantasize being friends with Superman. In this sense, he serves a similar function to Robin from Batman fiction. In the earliest comic book stories, Clark Kent's employer is George Taylor of "The Daily Star", but the second episode of the radio serial changed this to Perry White of the "Daily Planet". Perry White does not know Clark