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 (Kingdom Come) powers from Williams, killing him, and reclaiming all of his own powers. Superman remains with the New Earth JSA. He is suspicious of the revived David Reid, who has been revived as Magog, and fearful that Reid will become like the being he knew on Earth-22. The "Daily Planet" is attacked and flooded with a green gas. Superman arrives and has a flashback to the time the Joker attacked his world's "Daily Planet". The green gas is filled with kryptonite, which has no effect on Superman other than to cause his eyes to sting. Superman captures the terrorists and questions