Karate Bull Fighter (1975): The first in a trilogy of films based on the life of Sonny Chiba's mentor, martial arts master Matutatsu Oyama.

A young Oyama arrives in tatter rags to compete in a karate tournament. When an entrepreneur, impressed by his strength and style, wants to groom the young fighter for the big leagues, Oyama rejects his offer.

Oyama denounces martial arts after killing a gang leader in a bar fight and, ridden with the guilt of killing the man, goes to work on the gang's leader's farm with his widow. But deep down, Oyama knows he can't turn his back on martial arts so he returns to the city. When an assassin is hired to stop Oyama from re-entering the world of martial arts, Oyama must take revenge on those who try to stop him.

Karate Bear Fighter (1977):

Karate For Life (1977): The final chapter in the trilogy based on the life of Sonny Chiba's mentor, martial arts master Masutatsu Oyama

The Karate Society of Japan ostracizes Masutatsu Oyama after fighting both a bull and a bear. Being well known all over Japan, Oyama is approached by a promoter looking for talent for an exhibition game. Accompanied by Fujita, a judo expert, Oyama goes to Okinawa to do a demonstration of his mighty skills at the exhibition. When the two fighters are asked to agree to fight in a prearranged game where the opponents play dirty, Oyama loses all self-control...