Film: It Came from Outer Space (1953)
Alias: Xenomorphs (Yes, really)
Height/Weight: Not entirely clear based on the shots.
Summary: Sometimes, aliens just want to cruise along the stars and see the galaxy for what it is. But like anyone else, there are accidents, and the cycloptic aliens of '53 had one doozy of an accident when they crashed on the paranoid little blue planet that is Earth.
History: Apparently galactic sightseers, these aliens ran into a bit of a jam when their oddly soccer ball-shaped ship crashed into the deserts of Sand Rock, Arizona. To add insult to injury, a landslide occurred after the ship opened its doors, burying it. The aliens knew they had to get off this rock before the locals got nasty, so they began to capture unsuspecting humans and copy their forms in order to gather supplies for repairing the ship.
Notable Kills: None.
Final Fate: Ultimately, the aliens made sure no harm was done, and although some trigger-happy humans killed a couple of them, the rest managed to get the ship in working condition with the aid of a trusting individual, release the captured humans, and blast off into space. However, according to one of the humans, this would not be the last time we would see them.
Powers/Abilities: The aliens are capable of copying the form of anyone they chose in order to avoid detection. Their tech is also something.
Weakness: Anything conventional.
Scariness Factor: 2-Despite a slightly intimidating appearance and power, the aliens don't want to hurt anyone, and actively avoid conflict at any turn. In their own words, "We have souls and minds and we are good."
Trivia: -The original concept for the alien would be used later as the design of the "Metaluna Mutant" from "This Island Earth".
-The glowing effect of the ship was achieved by placing burning magnesium inside the ball.