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
Mongo (fictional planet) "familiarly Asian". Mongo (fictional planet) Mongo is a fictional planet where the comic strip (and later movie serials) of "Flash Gordon" takes place. Mongo was created by the comics artist Alex Raymond in 1934, with the assistance of Raymond's ghostwriter Don Moore. Mongo is depicted as being ruled by a usurper named Ming the Merciless, who is shown as ruling Mongo in a harsh and oppressive manner. The planet is depicted as being inhabited by different cultures, and having a varying ecosystem. The technology of these cultures varies from groups at a Stone Age level, to highly technologically advanced peoples.