Film: 20 Million Miles to Earth (1957)
Location: Civilized area
Height/Weight: Grew up to the size of a small building.
Summary: F*CK PEPE! That kid is the reason this alien had to suffer the way he did. Indeed, the life of the Ymir can best be summed up as the slow and painful downward spiral of everything trying to harm him one way or another. It's just...awful.
History: At some point, a rocket was sent to Venus as the first ever planetary expedition. Unfortunately, a meteor struck the rocket as it came back to Earth, causing it to plummet into the ocean depths near Sicily. The only survivors are one man and one alien embryo, the latter of which is given to a zoologist by a whiny git named Pepe in exchange for a cowboy hat. Yay. Alas, the embryo hatched, and the Venusian Ymir was free to rapidly grow and run away from the dangers of man. But this beast would only know pain, as no matter where he went, there was always something or someone trying to hurt him in some capacity.
Notable Kills: Nothing special.
Final Fate: After being chased up to the ceiling of an ancient Roman coliseum, the Ymir is finally shot down by a lucky rocket shot from the military, causing him to plummet to the ground, get crushed by falling debris, and mercifully die.
Powers/Abilities: Due to the stark contrast in Earth's atmosphere, the Ymir's metabolic rate is out of control, causing him to double in size almost every day. He also has no internal organs, instead a series of tubes, so shooting him is useless.
Weakness: Only heavy artillery can hurt him.
Scariness Factor: 3-If it weren't for the fact that its growth was a threat to all life on Earth, there would be absolutely no reason to fear the Ymir. Its actions were purely based on fear and being provoked rather than bloodlust, as it was content to feast entirely on sulfur. A particularly poignant scene is when the Ymir confronts a lamb and just stares at it rather than attack it. The Ymir was merely a stranger in a stranger land.
Trivia: -The Ymir was named after the giant in Norse mythology said to have been so large that his eyebrows became the realm that the humans lived in, the rest of his corpse forming all other aspects of the Earth and heavens.
-Rome is only in the film because Ray Harryhausen wanted a vacation there.