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Caltiki – The Immortal Monster (Italian: Caltiki – il mostro immortale) is a 1959 Italian-American science fiction horror film directed by Riccardo Freda and Mario Bava. The plot concerns a team of archaeologists investigating Mayan ruins who come across a shapeless monster. They manage to defeat it with fire, while keeping a sample of the monster. Meanwhile, a comet is due to pass close to Earth, the same comet which passed near the Earth at the time the Mayan civilization mysteriously collapsed. The film proposes the question "Is there a connection between the monster and the comet?"