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 tournamen.