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. —IMDb
I went and saw this at the cinema when I was 11. Vanilla Ice was at the peak of his game, motherfucker could do no wrong. When he appeared onscreen, the whole cinema started cheering, and I jumped up and started dancing to Ninja Rap. I don't remember anything else about the film, but it 3 stars for that.