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 hope. Clark works as a newspaper journalist. In the earliest stories, he worked for "The Daily Star", but the second episode of the radio serial changed this to the "Daily Planet". In comics from the early 1970s, Clark worked as a television journalist (an attempt to modernize the character). However, for the 1978 movie, the producers chose to make Clark a newspaper journalist again because that was how most of the public thought of him. The first story in which Superman dies was published in "Superman" #149 (1961), in which he is murdered by Lex Luthor by means of kryptonite.