Underground (2010)

Raised as a slave, Danny is used to fighting for his survival. In fact, his "master," Bart, thinks of him as a pet and goes as far as leashing him with a collar so they can make money in fight clubs, where Danny is the main contender. When Bart's crew is in a car accident, Danny escapes and meets a blind, kindhearted piano tuner who takes him in and uses music to free the fighter's long-buried heart.

A former fighter reluctantly returns to the life she abandoned in order to help her sister survive the sadistic world of illegal fighting and the maniac who runs it.

An underground MMA fighter must confront his sister and his past in an adventure through parallel universes

A drifting ex-soldier turns underground fighter with the help of a just-released ex-con, pitting him against corrupt cops and hired killers now gunning for him and all those he cares about.

An unscrupulous boxer fights his way to the top, but eventually alienates all of the people who helped him on the way up.

Retired martial arts world champion Alex Faulkner has settled into a simple life, when the disappearance of two of his students leads to an unthinkable discovery close to home. Just when all hope of finding the children is lost, he locates the imprisoned girls and unsurfaces an international child trafficking operation, which draws him back into the fight of his life against those behind it.

Ex-con Kris Chaney seizes the daughter of a Colombian gangster to fulfill a noble promise to the young girl's mother. When her father enlists both the criminal underworld and a psychotic killer to exact his revenge, Kris relies on everything he's ever learned to stay alive and keep his word.

In the late 1990s, up-and-coming mixed martial artist Mark Kerr aspires to become the greatest fighter in the world. However, he must also battle his opioid dependence and a volatile relationship with his girlfriend Dawn.

When Karate champion Michael Rivers wins the last tournament of his career, shady businessman Ron Hall offers him the opportunity to fight in an illegal Kumite in Bulgaria against the world’s best martial artists. When Michael declines, Hall has his daughter kidnapped and, in order to rescue her, Rivers is left with no choice but to compete in the deadly tournament. Arriving in Bulgaria, he finds out that he is not the only fighter whose loved one was taken. Rivers enlists the help of trainers Master Loren, and Julie Jackson but will it be enough for him to win the tournament and save his daughter’s life?

In Los Angeles, an ex-con takes the underground fighting world by storm in his quest to fulfill a promise to a dead friend.