Dolores, an innocent country girl, arrives as a maid to a rich house, where she meets a street vendor with whom she falls in love, until the dangers of the city catch up with her.
A mad scientist terrorizes a city by kidnapping young women with his ape-man Gomar and then using them as subjects in sadistic brain transplant experiments. A female wrestler whose sister was one of the victims swears vengeance against the Mad Doctor.
Intimate problems and the wickedness of friends is resolved in the ring.
A thief commits several misdeeds and, to mislead the police, keeps jewelry in the house of his fiancée, whom he seduces to prevent her from discovering the theft.
In this Mexican version of Winterset (inspired by the 20s Sacco Vanzetti case) an idealistic youth searches for the culprit behind a crime that his father was wrongly accused of several years before.
A physician launches his own investigation into a gang of opium traffickers, while a mother who lost her son to the drug vows revenge against those who led him into that world.
