Thomas Hoshino is a tough Japanese detective, who lost his partner by a deadly Yakuza killer Jaho. He tracks down the killer and his master to Los Angeles, where he teams up with Det. Karen Ryder. Soon they discover that Jaho is preparing a gang war and weapon smuggling ring. Hoshino must find a way to defeat the killer who posses mystical ninja powers.

一位在墨西哥自我隐匿的前警察因徒弟的一段打斗视频在网上疯传而成为被追杀的目标。

A lawyer's family is murdered by drug smugglers, and he is beaten and left for dead, but survives although in a coma. When he awakes he only has a partial memory of what happened. In order to find out the real story, he trains with a karate master and becomes a mysterious avenger known as "The Karate Man".

In the year 2007, crime has risen at an exponential rate. Once highly populated metropolises such as Los Angeles are no longer inhabitable. These cities have transformed into "Hell Zones," ruled by violent street gangs. The Hell Zone, formerly called the "Zone of Personal Freedom," is a safe-haven for criminal warpaths everywhere. This Hell Zone in LA is controlled by a criminal mastermind named Drexal (Joseph Ruskin). For the sake of entertaining his crowds of decadent losers and underlings, Drexal has staged a series of lethal, no-holds-barred matches in the "Death Ring," where the winner takes all of the glory...while the defeated one shall lose his self-respect (or maybe just his head). Meanwhile, two brave cops, Braniff (Chad McQueen), and Sledge (Gary Daniels) must risk their badges...and their lives when they enter Los Angeles's "Hell Zone."