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, although this may also be due to the strain put on their bodies from their extended lifespans.

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.

Technology
The aliens achieved highly advanced technology, utilizing flying saucer-shaped spacecraft capable of crossing solar systems. These ships have cylindrical landing gear, and can project a forcefield around the ship's immediate area, which is impervious to Earth's ballistic weaponry. However, the forcefields are not completely solid against physical objects, allowing slow-moving physical objects to pass through it, such as the aliens, who can walk in and out of the protective field. Internally, alien spacecraft contain a round, central chamber, often used to hold prisoners, and sports several viewing windows around it. In addition, a strangely-shaped device can descend from the ceiling of the ships, allowing them to both translate other languages with a somewhat distorted robotic voice and extract information from the brains of other beings. Alien weaponry include disintegration rays, capable of vaporizing multiple targets, including large machinery, in a single shot. Another form of notable alien technology are their life support suits, which are capable of keeping them alive for extended periods of time, far beyond their natural lifespans. The suits are entirely smooth, with bullet-shaped, featureless, and opaque helmets, which appear incapable of turning. Strangely, although the suits bear visible joints for their shoulders and pelvis, they lack any elbow joints. While appearing to be made of metal, the alien life support suits are actually solidified electricity, and are very light. They are armed with a disintegration ray built into their hands. Despite their incredible advancements and destructive capability, their suits can be penetrated by small arms fire.

Appearances

 * Earth vs. the Flying Saucers (1956)