Karate Wars (1978)

A few years after his breakthrough, Sanshiro resumes his path to judo mastery—testing his discipline against an American prizefighter and later facing vengeful karate brothers. As rival schools and public spectacle push him toward violence, he must reconcile strength with restraint and the true spirit of his art.

His name is Baki Hanma. No one knows where he came from or where he learned his unique fighting style. When it comes to Karate, Baki Hanma is just plain GOOD. He can defeat an opponent with a single blow and he's taking the Karate Championship by storm. In a prestigious match, he defeats competitor after competitor even though he's totally unknown and barely even ranked. But now he's in for the fight of his life and he may have just met his match. Anything goes and his opponent can rip his nerves out -- literally. If he wins, he's the BEST. If he loses... he's DEAD.

Nick and Ruben are hoodwinked into a "shootfighter" (no-holds-barred, to the death) martial arts match by the evil Mr. Lee, who has a grudge against world shootfighter champ(and teacher of Nick and Ruben) Shingo.

Rick, a down-and-out American boxer, is hired to transport a sword to Japan, unaware that the whole thing is a set up in a bitter blood-feud between two brothers, one who follows the traditional path of the samurai and the other a businessman. At the behest of the businessman, Rick undertakes samurai training from the other brother, but joins his cause. He also becomes romantically involved with the samurai's daughter.

Li Mansei is a martial-arts champion turned undercover agent. When he is captured by a drug lord, his sister Li Koryu turns to his former martial-arts school, including the powerful Sonny Kawasaka, for help in the inevitable battle royale.

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.

Two feuding brothers (one a policeman, the other a martial arts expert) of different political views, join forces to avenge the death of their father, a retired agent, killed by the mafia.

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?

A businessman, Tsuda, runs into a childhood friend, Kojima, on the subway. Kojima is working as a semiprofessional boxer. Tsuda soon begins to suspect that Kojima might be having an affair with his fiancée Hizuru. After an altercation, Tsuda begins training rigorously himself, leading to an extremely bloody, violent confrontation.

Three middle aged men polish their martial arts skills to avenge their fallen master.