15 years ago in New York, a mysterious radioactive ooze mutated four sewer turtles into talking, upright-walking, crime-fighting ninjas. The intrepid heroes -- Michelangelo, Donatello, Raphael, and Leonardo -- are trained in the Ninjutsu arts by their rat sensei, Splinter. When a villainous rogue ninja named Shredder and his Foot Clan arrive and spread lawlessness throughout the city, it's up to the plucky turtles to stop him.