Invincible Enforcer

Russian inmate Boyka, now severely hobbled by the knee injury suffered at the end of Undisputed 2. No longer the feared prison fighter he was, he has declined so far that he is now good only for cleaning toilets. But when a new prison fight tournament begins - an international affair, matching the best fighters from prisons around the globe, enticing them with the promise of freedom for the winner - Boyka must reclaim his dignity and fight for his position in the tournament.

In 2001, where all correctional facilities have been privatized, martial artist Ricky finds himself victim to the corrupt system, found "guilty" of the manslaughter of an infamous crime boss.

A young Asian American martial artist is forced to participate in a brutal formal street-fight competition.

A man is framed for murder by his drug-dealing best friend who covets his girlfriend, leading to eight years in jail and a vow of revenge upon release.