Alien (12 to the Moon)

This unnamed species lives in a sealed city within the interior of Luna. Their appearance is unknown. They communicate solely by telepathy (referred to as "thought waves") and possess technology that allows them to put the entire North American continent in suspended animation from space. These aliens claim to possess none of the typical emotions displayed by Humans, such as love, greed, lust and passion for conquest.

History
When the Human spaceship Lunar Eagle 1, crewed by an international assemblage of scientists, landed on the Moon in order to claim it as international territory for all humanity, these aliens were disturbed. They found Human emotions strange and possibly dangerous, and threatened to destroy the entire Human race if they concluded that they represented a threat. When two of the astronauts fell in love, the Moon aliens decided to study them, as they found that Human concept particularly intriguing. After observing how Humans are willing to die to save their fellow men, the aliens came to the conclusion that the species does possess admirable qualities, and expressed their hopes that one day, the two races could become friends.

Appearance

 * 12 to the Moon (1960)