Alien (Earth vs. the Flying Saucers)

This unnamed humanoid species were almost entirely wiped out by the destruction of their solar system, with their last members being killed in a failed attempt to occupy Earth.

Biology
Most of the aliens' biology is unknown, but it is known that they are humanoids who bear at least some resemblance to the classic Grey. Their heads are hairless with flat noses, perpetually frowning mouths, large, dark eyes, no external ears, and thin, wrinkled greyish-brown skin. However, the aliens who were seen by Humans had artificially prolonged their lifespans with life support suits, so it is possible that their natural appearance is different from what was seen when unmasked, such as not being as thin or wrinkled. When killed, their bodies would soon dissolve into nothingness.

Culture and society
The aliens were known to be emotionless, seeking another habitable planet to relocate their species to after their system's destruction. They saw Earth's space-related technologies as primitive, and due to their emotionless nature, had no remorse in causing widespread destruction on Earth.

Appearances

 * Earth vs. the Flying Saucers (1956)