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The evil Dr. Krupp (Luis Aceves Castañeda), also known as "The Bat", plots to steal a valuable Aztec treasure from the tomb of a centuries-old living mummy, Popoca (Angel di Stefani). Krupp builds a robot to defeat the mummy. Krupp's former colleague Dr. Eduardo Almada (Ramón Gay) and associates work to stop the mad scientist from creating his robot. The movie shows a notable lack of awareness of Mesoamerican civilizations, as it suggests the Aztecs practiced mummification and used hieroglyphics. In reality, they had no system of writing and practiced cremation and (more often) simple burial. It was the Inca civilization that practiced mummification, and the Maya who had a system of hieroglyphics. Also, the mummy is depicted in the Egyptian style (upright or lying on it's back) rather than in the Inca style (hunched into a ball with it's feet pulled to the body and it's knees close to the face).