 Dr. Almada attempts to prove his theory that people can be regressed to past lives by hypnotizing his lover Flor. Finding out that in a previous life Flor was the Aztec maiden Xochitl, killed and entombed for having an illicit affair with the warrior Popoca, Almada is able to find the tomb and with it two valuable pieces of jewelry, which he steals. His problems have just begun, however, as taking the jewelry triggers the revivication of Popoca, the living mummy.