In the wake of a young Jewish girl’s disappearance, the son of a Hasidic funeral director returns home with his pregnant wife in hopes of reconciling with his father. Little do they know that directly beneath them in the family morgue, an ancient evil with sinister plans for the unborn child lurks inside a mysterious corpse.

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.