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: Secret Origin an enemy. Superman leaves anyway, and Sam orders the Army to attack. The soldiers do little to Superman, but John, in the Metallo suit, manages to weaken him by exposing him to the kryptonite. Ricocheting bullets hit the kryptonite, which explodes and injures John and allows Superman to escape. Sam and his troops arrive at the "Daily Planet", and orders it shut down until they can get definitive answers about Superman. Lex takes John into surgery and replaces his heart with a kryptonite generator, turning him into Metallo. Sam reveals to Lois, Perry, and the "Daily Planet" staff that Superman