Krypton is a fictional planet in the DC Universe and the native world of Superman. In some stories, it is also the native world of Supergirl, Krypto the Superdog, and Power Girl (in her case, an alternate-universe version designated "Krypton-Two"). Krypton has been consistently described as having been destroyed just after Superman's flight from the planet, though the exact details of its destruction vary by time period, writers, and franchise. Kryptonians were the dominant species on Krypton.