When Dr. Almada (Ramon Gay) hypnotizes his fiancée, Flora (Rosa Arenas), he learns she's the reincarnation of an Aztec maiden who was killed for loving a warrior in this Mexican horror flick. They travel to the site of her remains, a hidden chamber in the Great Pyramid of Yucatán, where they encounter her former lover, now a mummy (Angel Di Stefani). His wrath awakened, the mummy follows them to Mexico City, terrorizing everyone in his path.