Immutable

Two brothers compete in the world's deadliest underground fighting tournament, where they must decide whether to play by the rules or to cast their honor aside and team up to bring down the dark syndicate running the tournament.

After her brother's death, June moves to Milan for a fresh start, finding comfort in Will, the perfect honor student at her new international school. But when his troubled best friend James—hiding a dangerous life in clandestine MMA fights—sparks a rivalry that quickly turns into irresistible attraction, June must choose between safety and a love that upends everything she thought she wanted.

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.

A female boxing trainer discovers that her champion cage-fighter boyfriend has been cheating on her with her sister and decides to seek revenge by training up his arch-rival to challenge him.