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 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