Jackie Chan stars as a hot-shot lawyer hired by a Hong Kong chemical plant to dispose of opposition to their polluting ways. But when he falls for a beautiful woman out to stop the plant, Jackie is torn in a conflict of interest and asks his trusty friends Samo and Biao to help out at least until they discover the true purpose of the plant.

The turtles find out where the Ooze, the substance which made them mutate, came from. Unfortunately Shredder learns about it too, and uses it to enhance himself. So the turtles have to prove again who's the better ninja fighter.