When a young boy’s four pet turtles accidentally end up in the sewers of New York, they come into contact with a radioactive ooze that miraculously increases their size, enables them to walk upright and gives them the power of speech. Over the years, they make regular forays into New York, disguised by sunglasses, hats and trench coats, learning the ways of the humans, visiting the cinema and developing a taste for pizza. Under the guidance of a wise, similarly mutated rat named Splinter, the turtles – Raphael, Leonardo, Michaelangelo and Donatello – are trained in the ancient art of Ninjitsu. Using their skills to fight crime, the Teenage Mutant Ninja Turtles find themselves up against The Foot, a gang of teenage thieves led by an aging ninja assassin known as The Shredder. Aided in their struggle against The Foot by beautiful, young TV reporter April O’Neil and self-appointed vigilante Casey Jones, the Turtles must battle to save New York from an evil nemesis bent on world domination.