Amorphous creature
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The amorphous creature is a common trope in science fiction. Usually it is depicted as a living mass of jelly-like substance that can take any shape it wants. Perhaps the most familiar example is the title alien from the movie The Blob, but two other examples are the vermicious knids from Charlie and the Great Glass Elevator and a giant pasty mass of protoplasm found in Venusian jungles in one of Stanley G. Weinbaum's few short stories.
Amorphous creatures are to be distinguished from shape-shifters that can change their appearance to mimic whatever they like, such as the T-1000 from Terminator 2: Judgment Day, or the title character from The Thing.