El Enmascarado Negro

A young man is the heir of a very old house in San Angel. Upon marriage, he decides to live there but after a long time, very strange things begin to happen in the house. Then he discovers that there are mummies hidden that awake in the night.

A young heiress is kidnapped by two aspiring thieves who are then captured by a mad scientist. It's up to the police, Santo, and Blue Demon to rescue them.