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
Superman: Secret Origin "flying man" isn't even human. Clark leaves, and on the roof of the "Daily Planet", sees Jimmy on the ledge. They talk about how they're currently feeling, with Jimmy thinking of returning to New York. Clark persuades Jimmy to stay, since he's his "only friend" in Metropolis, and lets Jimmy take his picture. The next issue of the "Daily Planet" runs with Lois's story and Jimmy's picture, naming "Superman" as the city's new savior. Lex, furious, declares a personal war on Perry White. After Superman puts out a fire in the "Daily Planet"’s main warehouse, he tells Jimmy and Lois