The Instructor (1983)

Picking up after the events of Never Back Down 2, former MMA champion Case Walker is on the comeback trail to become champion once again.

Four fighters from different backgrounds come together to train under an ex MMA rising star and then ultimately have to fight each other and the traitor in their midst.

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

Two warring gang families (one African-American, the other Chinese) maneuver for bragging rights to the Oakland, California, docks. Hang Sing and Trish O'Day uncover a trail of deceit that leaves most of the warring factions dead … or worse!

Jones is a secret agent who has gone into semi-retirement, concentrating instead on teaching the martial arts to inner city youths. The karate school is run by a kindly old coot named Pops. His gambling debts, however, bring the local thug, Pinky, down on him. To make matters worse, Pinky is then hired by some white thugs who want to get a hold of the property Pops' school occupies so they can build a shopping mall. When things get heavy, Black Belt Jones leaps into action. Only he's not alone. Pops' daughter, Sidney, shows up to lend a hand, proving herself every bit as agile and powerful a martial artist as Jones.

Brazil is a contract killer, willing to take any job if the price is right. Flint left the assassin game when a ruthless drug dealer’s brutal attack left his wife in a coma. When a contract is put out on the same coldblooded drug dealer, both Brazil and Flint want him dead – one for the money, the other for revenge. With crooked Interpol agents and vicious members of the criminal underworld hot on their trail, these two assassins reluctantly join forces to quickly take out their target before they themselves are terminated.

After a blood- soaked jujitsu match in Dubai, fighting legend Mickey Kelley falls to superstar Blaine. But years later, an online video proves that Blaine cheated, and the world demands a rematch. Can the aging underdog get back into shape in time to vanquish his foe, get revenge, and claim his prize?

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.

In a dystopian Detroit, grand houses that once housed the wealthy are now homes of the city's most-dangerous criminals. Surrounding the area is a giant wall to keep the rest of Detroit safe. For undercover cop Damien Collier, every day is a battle against corruption as he struggles to bring his father's killer, Tremaine, to justice. Meanwhile, Damien and an ex-con named Lino work together to save the city from a plot to destroy it.

A westerner named Casey, studying Ninjutsu in Japan, is asked by the Sensei to return to New York to protect the legendary Yoroi Bitsu, an armored chest that contains the weapons of the last Koga Ninja.