The Adventures of Superman (radio) home planet of Krypton is located on the far side of the sun, as opposed to a distant star system as it is in most stories. During the journey to Earth, baby Kal-el grows into an adult and emerges fully grown from his ship after it lands on Earth. He is never adopted by the Kents but immediately begins his superhero career. This was eventually retconned in later episodes to match the narrative of the comic books. This serial introduced the fictional mineral kryptonite, the radiation from which can weaken and even (in some continuities) kill Superman. Aside from giving
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