This film begins with a young woman by the name of "Ann Taylor" (Rosita Arenas) being hypnotized by a scientist named "Dr. Edmond Redding" (Ramon Gay) in order for her to recall a past life involving an elaborate Aztec ceremony in which she is soon to be sacrificed. Also being sacrificed at that time is an Aztec warrior whose body is subsequently mummified. Not long afterward, Dr. Redding organizes a field trip to that exact Aztec pyramid described by Miss Taylor. Once inside one of the secret chambers, however, they are attacked by an ancient mummy who they manage to subdue and subsequently transport back with them. Likewise, they also transport another mummy which appears to be more modern in appearance as well. Naturally, quite pleased with their discovery, Dr. Redding immediately calls in various members of the scientific community to show off his findings. As it so happens, however, another scientist named "Professor Janning" (Yerye Beirute) has managed to infiltrate the meeting and, after killing Dr. Redding, has his men steal the more modern mummy on display. Once the mummy is in the lab, Professor Janning tries to revive the mummy--but he is unsuccessful due to the lack of enough electricity needed for the procedure. At least, that is what he thinks. So, in his eagerness to continue his research, he hires a man to steal the ancient mummy while he and his associates deal with other matters outside of the laboratory. Meanwhile, a lightning burst from a thunderstorm reinvigorates the first mummy who then turns into a werewolf and begins to terrorize the town. At the same time, the ancient mummy is also revived and heads directly toward the home of his long-lost love--Ann Taylor. Now, rather than reveal any more, I will just say that this movie essentially spliced two previous films of Mexican origin titled "La Momia Azteca" and "La Casa del Terror" together in order to come up with something entirely new and different. Unfortunately, the result turned out to be quite bad as the two films simply didn't mesh well together at all. That being said, if the viewer is curious, I would recommend the two original films in question over this particular one as--like I said before--it is quite bad.