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Cthulhu is the main antagonist of the 2020 science-fiction thriller/horror film Underwater. In the film, Cthulhu has been reinterpreted and simplified as a very large organism, and has no known supernatural powers, sapience, or extraterrestrial origins. Nor does the sight of him invoke madness and insanity in the other characters. In the plot, Cthulhu is the alpha creature to a large swarm of underwater spawns, possibly Deep Ones or Xothians, but also never named in the film. He seems to behave

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