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: Grounded plays with them without using his powers. Markey G gets a basket on Superman and earns the approval of his friends. Superman hears a vibration and approaches a seemingly normal looking man at his house. The man is revealed to be an alien, and when he leads Superman into the house a large, black creature attacks Superman. Superman dismantles the creature and the aliens reveal that they came from the planet Natalla to escape from an unknown tragedy. They plead with Superman not to reveal them, given how hard their life is back home. They point out that he too