Bloodsport 4 is an action movie directed by Elvis Restaino. In the film, Agent John Keller (Daniel Bernhardt) is a cop who participates in illegal street fighting but takes his job seriously. When he is asked to go undercover in a prison to investigate the disappearance of prisoners' dead bodies, he is eager to sign up for the job. The assignment is at Fuego Penal, a tough prison where Keller will pretend to be a death row inmate. He begins to gather clues about the disappearing bodies when he learns he is being targeted by Justin Ceasar (Ivan Ivanov). Keller may be getting closer to the truth than he wanted when he learns he must fight in a Kumite style event that Ceasar has organized. Since the other inmates think he is a fellow prisoner, Keller has no way to escape. Will the undercover agent find out what is happening at the prison before it is too late?