Superman (Earth-One) details on the Earth-One Superman's origin and childhood/teenage years, see Superboy (Kal-El)." The Earth-One Superman's origin story was retold in various stories; the most prominent retellings were in "Superman" (volume 1) #146 (July 1961), "Limited Collectors' Edition" #C-31 (November–December 1974), and "Action Comics" #500 (October 1979). As recounted in these retellings, Superman was born Kal-El on the planet Krypton. Upon learning of Krypton's imminent destruction, his father Jor-El and mother Lara sent Kal-El in an experimental rocket to Earth moments before the planet exploded. Landing outside of the town of Smallville, Kal-El was found and adopted by an elderly farm
Origin of Superman matures during the flight and emerges full-grown as an adult when he lands on Earth. He is greeted by a man and a boy who give him the idea of disguising himself as Clark Kent, after which he looks for a job at the Daily Planet. Among other concepts and characters, the radio program introduced kryptonite into the Superman mythology. These fragments of radioactive debris from Superman's home planet were created to allow actor Bud Collyer the occasional time off from recording, as Superman periodically succumbed to the baleful rays and be absent for some episodes. Kryptonite was incorporated into