Through contact with a mysterious substance, called Ooze, 4 little turtles in the canalization of New York mutate to giant turtles. They can speak, walk upright and love pizza. The wise rat Splinter becomes their mentor and educates them to Ninja fighters. Their arch-enemy is the bad, bad guy Shredder, who struggles to gain power over the world. Of course the ninja turtles will do everything to stop him.

Detective Chris Kenner was orphaned as a child as his father was in the service and was killed and lived in Japan. Now he is on the trail of ruthless Yakuza leader named Yoshido, who helped establish a small Japanese area in Los Angeles and is now running a drug ring disguised as a brewery. However, Kenner must team up with a Japanese-American detective named Johnny Murata, and he also must protect a witness named Minako who would testify against Yoshido. But what Kenner will soon discover that...

Two New York cops get involved in a gang war between members of the Yakuza, the Japanese Mafia. They arrest one of their killers and are ordered to escort him back to Japan. In Japan, however, he manages to escape. As they try to track him down, they get deeper and deeper into the Japanese Mafia scene and they have to learn that they can only win by playing the game the Japanese way.