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Archaeologists investigating some Mayan ruins come across a blob-like monster. They manage to destroy it with fire, but keep a sample. Meanwhile, a comet is due to pass close to the Earth - the same comet passed near the Earth at the time the Mayan civilization mysteriously collapsed. Coincidence?
Riccardo Freda would later claim that he abandoned this project so that Mario Bava, who he knew could be a good director, would have a chance to direct.