Klaatu's Species

This humanoid race seems to be outwardly Human in appearance. Its only known member is Klaatu, whose spaceship landed on Earth, in the United States, to deliver a message to humanity.

Appearances

 * "Farewell to the Master" by Harry Bates (1940)
 * The Day the Earth Stood Still (1951)
 * The Day the Earth Stood Still (2008)