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.