ATTACK OF THE MAYAN MUMMY

Dr. Eduardo Almada, a scientist with controversial views on hypnosis and past lives, presents his theories before a group of neuropsychiatrists and is met with extreme skepticism. Realizing he needs proof in order to convince others of his theories, Almada decides to conduct an experiment on his fiance, Flor Sepúlveda which he does reluctantly after she volunteers. Unbeknownst to the couple, they are spied upon by a master criminal known as "The Bat", secretly Almada's academic rival Dr. Krupp. Under hypnosis, Flor reveals her past life as the ancient Aztec woman Xochitl who was selected by her people to be sacrificed to the god Tezcatlipoca. Before she was to be sacrificed, Xochitl was discovered in the romantic embrace of warrior Popoca and severely punished for this offense. Popoca, for his "corruption" of the virginal Xochitl, is buried alive and cursed to spend eternity guarding two sacred relics entombed with him, a golden breastplate and armband which serve as keys to a vast hidden treasure. Xochitl herself is also sacrificed and buried in the same tomb alongside her lover.

Realizing the validity of his theory, Almada resolves to find the tomb of Xochitl and recover the artifacts as proof for his theory. Upon enlisting the help of several other scientists, the group set off to find the tomb using Flor's past-life memories. Eventually discovering the tomb's secret entrance, the group enters the burial chambers and uncovers the bones of Xochitl and the sacred artifacts. Retrieving the breastplate, the group leaves, not noticing Popoca has reanimated and is following them. Arriving back in Mexico City, Almada presents his discovery to the group of scientists who further uncover a series of hieroglyphics etched into the breastplate telling of a vast treasure that can be unlocked using the armband which reveals its location. Before the group sets forth to retrieve the armband, Popoca arrives and attacks the group who barely manages to escape.

Meanwhile, The Bat, having been spying on the group the entire time, sends some of his henchmen to retrieve the breastplate which the group has taken to Flor's house in their escape from Popoca. The henchman's assault on the group is cut short by the arrival of Popoca, who slaughters the men before retrieving the breastplate and abducting Flor, whom he recognizes as the reincarnation of Xochitl. Popoca makes his way back to the tomb, intent on sacrificing Flor to Tezcatlipoca in order to appease the god and end his curse of immortality. The ritual is cut short by the arrival of Almada, who manages to hold the enraged mummy at bay with a crucifix while Flor is rescued. Breaking from the hold the crucifix has over him, Popoca lunges towards them, but seemingly perishes as Almada's friend Dr. Sepúlveda sacrifices himself by igniting nearby dynamite, collapsing the entire tomb onto both of them.

Free from her past self, Flor returns to civilization with Almada. The two then expose Dr. Krupp as The Bat who is then arrested by the police.

Popoca the mummy is destroyed when the tomb is collapsed using dynamite, saving Flor and allowing her and Almada to expose Dr. Krupp as The Bat.

The film closes with the ancient curse finally broken by a combination of self-sacrifice and modern science, as the tomb's destruction ends Popoca's reign and secures the safety of the present. Flor's liberation from her past life and Almada's exposure of The Bat tie up both the supernatural and criminal threads, typical of pulp horror's need for resolution.