El Santo is enlisted by Professor Romero (Caesar del Campo) for an expedition to the lost tomb of the Aztec warrior "Nonoc". The team of
explorers include include a native guide, the professor's grandson, two females, and hunter Sergio (Eric del Castillo). They uncover an ancient
scroll which warns that anyone who enters the tomb will awaken Aztec Mummy Nonoc and be cursed to death. The explorers are being stalked and
killed off by the avenging mummy- or are they? Santo must get to the bottom of the mystery that is killing off his team.