El Santo, the masked Mexican wrestler, investigates a series of kidnappings. He discovers that the mysterious Doctor Caroll is using the victims as part of his experiments to develop an army of monsters. Naturally, El Santo is able to overcome them all - with wrestling!

A vampire uses two sisters to seek revenge from the last member of a family that persecuted the undead in Europe, but his plan is threatened by a man who knows how to destroy him with a peculiar piece of music.

The story focuses in on three young boys who, arrested by the authorities, await sentencing in Mexico City's Juvenile Court. One boy has killed his stepfather to protect his mother; the second boy has been goaded into blinding his chief tormentor; and the third resorts to stealing to support his family.

A man dies and his mistress gives their son to his wife. Twenty years later...

Motherhood-and-martyrdom melodrama.