The evil Dr. Krupp (Luis Aceves Castañeda), a mad scientist also known as "the Bat", managed to escape the snake pit into which he was thrown by Popoca the Aztec Mummy (Ángel di Stefani) in the previous film and continues his efforts to steal a valuable Aztec treasure from Popoca's tomb. Krupp builds a robot with a human head and brain in it (which is thus, technically, a cyborg), planning to use it to destroy the mummy should he return to thwart his plans. Krupp's former colleague and original finder of the mummy, Dr. Eduardo Almada (Ramón Gay), his wife Flora, and his associate Pinacate, all work to stop the mad scientist from completing his plans.
Dr. Krupp gets inside the mummy's tomb and once again steals the gold breastplate from its resting place on the mummy's chest. When Popoca awakens in a rage, Krupp orders his human robot to fight him. The two monsters engage in a fierce struggle to the death, but the robot's ability to deliver burns due to electrical shocks from its hands quickly begins to wear the mummy out. Just as it seems the robot is winning, Dr. Almada bursts into the tomb and knocks the remote control from Dr. Krupp's hands, effectively shutting off the robot's brain. In a insane rage, Popoca attacks the robot, literally tearing it into scrap metal. Popoca strangles Dr. Krupp and his henchman Tierno, then stumbles off into another tomb where, hopefully, he can return to his rest and no one will ever disturb it again.
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