Thing (The Thing from Another World)

The Thing is a mysterious, highly-advanced sentient plant from an unidentified world.

History
At some unidentified point, The Thing crashed onto Earth in a Flying Saucer. Over time the ship was frozen and the Thing itself was buried in a lake in the Arctic until it was discovered by a scientific research team who mistook it for an unidentified aircraft.

Accompanied by members of the U.S. air force, they discovered that their find was in fact a flying saucer. The attempt to unearth the ship was unsuccessful, but they found the Thing, cut it out, and brought it back to base. Unfortunately, as it happened, the Thing was accidently thawed out and proceeded to start wrecking havoc on the men stationed there.

The Thing proved almost impossible to kill, as it could not be destroyed by flames or bullets, but was finally defeated when led into a trap containing concentrated electricity.