Girls of a corrupt orphanage are being sold by the sadistic matrons to a badly disfigured doctor. His sinister motive is to use the girls as guinea pigs in his experimental brain surgeries.

By chance, Miguel el Tarta becomes a potential boxing champion. Manipulated by Manolo, his opportunistic and cynical best friend, and several unscrupulous individuals, Miguel is thrown into the ring, where he tries to fight with more enthusiasm than technique.