Amalia, aged, remember when Fernando Mendoza, his former medical school, came to San Esteban, the town where she lived. They worked together and became his love. Although he was engaged to another, Fernando decided to return to the city to complete his commitment to her and finally reunited with Amalia, but the facts do not happen as they had planned.

An American cowboy living in Mexico discovers his cattle is being eaten by a giant prehistoric dinosaur.

A gang of thieves has jeopardized the city and even the police, whose chief urges their forces to captured the band within 48 hours. Meanwhile, band members meet in a cafe run by a widow and her daughter and her suitor, Cantinflas, who maintains a scuffle with the robbers running all at the station. Since then, Cantinflas become a member of the police force for special missions.

1953 film by Miguel M. Delgado