Ninja
Casey Bowman is an American orphan who was adopted into a martial arts dojo in Japan. Because of his perseverance and desire to master bushido, he earns the respect of the dojo's sensei and his daughter Namiko. However, the dojo's top student Masazuka becomes bitter over Namiko's friendship with Casey until one morning, during a sparring match, he loses his temper and nearly kills Casey by throwing a katana at him. In defense, Casey scars Masazuka below his right eye. As a result of his actions, Masazuka is banished from the dojo by the sensei.
Years later, Masazuka becomes an assassin under contract with an American conglomerate called Temple Industries, which itself runs an underground criminal cult known as "The Ring". He returns to his former dojo and claims in vain the sensei's succession as sōke, but the sensei refuses to oblige. Anticipating an invasion by Masazuka, the sensei assigns Casey and Namiko to guard an old chest called the Yoroi Bitsu, which contains the suit and weapons of an ancient ninja. Before Masazuka storms through the dojo and murders the sensei, Casey and Namiko manage to take the Yoroi Bitsu to New York City, where they keep it safe at Triborough University's vault with the help of the sensei's friend Professor Garrison. They are tracked down by Masazuka, who sends Temple's thugs to take down the couple. While Casey and Namiko are on the run from the thugs, they are framed for the murder of Professor Garrison and arrested. During their interrogation, Casey is ridiculed by Detective Traxler (Todd Jensen) for his story of a ninja for causing the deaths of many innocent bystanders, yet the very ninja slips inside the station under disguise. Masazuka cuts the power in the precinct and takes down several police officers in the dark before incapacitating Namiko. In the midst of the chaos, Casey saves Traxler from being gunned down by Masazuka before the assassin leaves the premises with Namiko, while Casey himself disappears.
After receiving a tip-off through a member of Temple's thugs, Casey storms through Temple Industries, retrieving Masazuka's phone number from the firm's president. He calls Masazuka and sets up a meeting place to exchange the Yoroi Bitsu for Namiko's life. Casey then rushes to the university to retrieve the chest and don the ninja suit and arsenal. At a construction site, Masazuka releases Namiko once the Yoroi Bitsu is lowered from a crane, only to discover the chest emptied of its contents. The two men prepare for a final showdown, but members of The Ring stage an ambush under Temple's orders to kill the trio. Casey, Masazuka and Namiko dispatch the thugs before Masazuka uses a blowgun to shoot a poison dart at Namiko and taunts Casey with the antidote bottle. Masazuka, however, drops the bottle, forcing Casey into a fit of rage. As an NYPD helicopter flashes its spotlight on the fight, Masazuka uses a ninjutsu technique to blind Casey with the reflections from his katana and disappear in front of him, but Casey uses his instincts to counter-attack and impale Masazuka from behind. Casey is saddened that he is unable to save Namiko, but upon remembering his sensei's teachings of a ninja's katana possessing the power to both kill and heal, he discovers that the handle of his katana contains the antidote. Within seconds, the antidote neutralizes the poison as Namiko awakens. Before they leave, Casey grants Masazuka's wish for decapitation.
The next morning, Traxler informs Casey and Namiko that Temple has been arrested and The Ring has been broken. He then hands them their passports, telling them to leave New York for good. The couple return to Japan to pay their respects to their late sensei and continue running their dojo.
revenge, murder, violence