Leo, Raph, Donnie and Mikey are four turtle brothers that escape from a dangerous lab in New York, where they metamorphosize into humanoids when a mutated Japanese sensei hides them from danger in the sewers bellow the city, becoming their father figure. Trained in martial arts to protect themselves, the four brothers team up with a determined young anchorwoman when they find out a dangerous link between TCRI CEO Baxter Stockman, and a the disfigured "Rat King".
