Krypton is a fictional planet appearing in American comic books published by DC Comics, most commonly appearing or mentioning in stories starring the superhero Superman as the world he came from. The planet was created by Jerry Siegel and Joe Shuster, and was named after the chemical element krypton. The planet was first mentioned in Action Comics #1 (June 1938) and made its first appearance in Superman #1 (1939). Krypton is also the native world of Supergirl, Krypto the Superdog, Beppo the Super-Monkey, Power Girl (in her case, an alternate-universe version designated "Krypton-Two"), and the supervillain General Zod. It has been consistently described as having been destroyed shortly after Superman's escape from the planet, although the exact details of its destruction vary by time period and writers. Kryptonians were the dominant species on Krypton. Krypton also makes an appearance in several television series such as Adventures of Superman, Lois & Clark: The New Adventures of Superman, Superman: The Animated Series, Smallville, Supergirl, and Krypton. Krypton appears in the 1978 film Superman, the 2006 film Superman Returns, and the 2013 film Man of Steel, set in the DC Extended Universe. Overview Krypton is usually portrayed in comics as the home of a fantastically advanced civilization, which is destroyed when the planet explodes. As originally depicted, all the civilizations and races of Krypton perished in the explosion, with one exception: the baby Kal-El who was placed in an escape rocket by his father, Jor-El, and sent to the planet Earth, where he grew up to become Superman. In some versions of the story, additional survivors were later discovered, such as Supergirl, her parents (kept alive in the "Survival Zone", a similar parallel "dimension" to the Phantom Zone), the criminal inhabitants of the Phantom Zone, Dev-Em, the residents of the bottled city of Kandor, the real parents of both Superman and Supergirl, and their pets Krypto the Superdog, and Beppo the Super-Monkey. Kandor, the first capital of Krypton, is miniaturized by Brainiac, but is eventually recovered by Superman and subsequently housed in the Fortress of Solitude for safekeeping. Soon afterward, Kryptonopolis becomes the second capital of Krypton. From the late 1980s through the early 2000s, the number of survivors was reduced to Superman himself in the comic book stories (the Eradicator was added in 1989 as a non-sentient device, and shown to be self-aware in 1991), but more recent accounts have restored Supergirl,