Penitentiary (1979)
A hitchhiker named Martel Gordone gets in a fight with two bikers over a prostitute, and one of the bikers is killed Gordone is arrested and sent to prison, where he joins the prisons boxing team in an effort to secure an early
Penitentiary II (1982)
An ex con, on parole and trying to straighten his life out, decides to resume his boxing career when one of his prison enemies escapes and kills his girlfriend
Penitentiary III (1987)
A man is framed for murder and sent to prison He is beaten and tortured, then forced to fight the prisons worst killer, a martial arts fighting midget called Thud
Welcome Home Brother Charles (1975)
After being released, a wrongfully imprisoned black man exacts vengeance on those whove crossed him via the power of his newly sentient penis, which may or may not be the result of an experiment gone wrong