Gervasio Robles, better acquaintance as The Pantera, is a man who lives in the low neighborhoods of the city of Mexico. It is attacked together with his fiancé Rosaura by 2 nicknamed delinquents " The " and Baboon " The Tereso ", who murder Rosaura. The Pantera is accused unjustly by the murder and is enclosed for 5 years in prison, where one of the convicts, nicknamed " Indian " decides to train it, teaching martial arts and tricks of combat to him, since it has been chosen by The General Ayala, chief of public safety, to turn into the new guardian of the city.

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