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: Unbound Despite everyone, including Supergirl, doing their best to fend his drones off, Metropolis is encased in a bottle and both Superman and Supergirl are captured. Having hooked Superman up to his ship, Braniac reveals that Earth offers nothing to him, tortures Superman by overloading his mind with data to obtain Kandor and attempts to destroy the planet. However, telling his captor what Earth means to him, Superman breaks free and then frees Supergirl and convinces her to stop the Solar-Aggressor from hitting the sun. Remembering Zor-El's words about Brainiac's ideals, Superman knocks him out of the ship and they crash