Charles Bronson (Tom Hardy) was born in an upper-class family. He had an irrepressible tendency to violence since childhood. Bronson failed to complete his studies and work like others. After getting married in 1974, Bronson was sentenced to seven years in prison for robbing a post office with a gun. Since then, Bronson abandoned his real name Michael and became a notorious British prison villain. Bronson, who was eager to perform, used violence as a way to become famous. He did not succumb to any discipline in prison, and at the same time, he was admired by the prisoners and received media attention. Bronson called himself "the most brutal prisoner in Britain". His prison life was a constant solitary confinement and constant change of prisons... After Bronson was released from prison, he joined the underground boxing world, but was soon imprisoned again. The story of prison thug Bronson continues... This film is adapted from a true story.