Klaatu's Species

"We have come to visit you in peace, with good will."

- Klaatu upon arriving to Earth

This humanoid race seems to be outwardly Human in appearance that first appeared in the short story "Farewell to the Master" and then in the "The Day the Earth Stood Still" movies. Its only known member is Klaatu, whose spaceship landed on Earth, in the United States, to deliver a message to humanity.

Biology
In appearance Klaatu's Species biology almost identical to humans, in the 1951 film it's stated that this due to their homeworld atmosphere being identical to Earth, however Klaatu's species can live much longer than humans due to their advanced technology.

Culture and society
Klaatu's Species wants to impose security in all planets and for this they have an organization for the mutual protection of all planets in which a race of robots patrols all planets keeping peace and eliminating aggression. Any planet that doesn't join this organization and extends it's violence outside of it's own planet is destroyed.

Unlike in the movies, in the "Farewell to the master" short story it is mentioned that the race of robots are the masters of Klaatu's Species.

Appearances

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