A private eye becomes the bodyguard of a beautiful reporter being pursued by a Japanese mob.

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.

A quartet of humanoid turtles, trained by their mentor in ninjitsu, must learn to work together to face the menace of Shredder and the Foot Clan.

The Turtles and the Shredder battle once again, this time for the last cannister of the ooze that created the Turtles, which Shredder wants to create an army of new mutants.