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) the Arlene Williamson version. Starting April 22, 1935, the radio serial "The Amazing Interplanetary Adventures of Flash Gordon", began airing. The series featured stories set on Mongo, closely following the plot of the comic strip. The 1936 serial depicts Mongo as a rogue planet drifting towards Earth. The serial's Mongo is a wild, rocky planet filled with monsters. The second Flash Gordon serial was set on Mars, but the third returned to Mongo. In "Flash Gordon Conquers the Universe" Flash and his friends travel to Mongo's land of Frigia to find a cure for the Purple Death, which is ravishing