Bloodsport 4 - The Final Chapter

Martial arts cop John Keller (Daniel Bernhardt) returns for another bloody mission. After several prison inmates are executed in mysterious circumstances, Keller goes undercover, posing as a prisoner. Wrongly blamed for the death of two prison officers after a fight breaks out, Keller finds himself on Death Row. Although still in contact with the outside world through his partner, Christy Blaire, Keller is trapped in a violent world ruled over by a corrupt warden and his bloodthirsty guards, where only the fittest can survive the frequent, fierce fights encouraged by them.