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
Origin of Superman Planet". Not only does everyone know they had a child; they were there shortly after Jon was born. The "Daily Planet" crew has known Jon his entire life." Flashbacks seen in that story indicate that the origin as depicted in the New 52 and in "Superman: Secret Origin" have been hybridized, with most of the characters' pre-"Flashpoint" histories overwriting early New 52 stories. In the DC Comics Multiverse, there are several versions of Superman originating from different parallel Earths. Most of these counterparts have subtle differences in their origins. Alterations to Superman's origin are also frequently used as the premises