After a long training stint the rain forest, Leonardo is eager to team up with his brothers again -- as the Teenage Mutant Ninja Turtles. But the leader of the group comes home to find each of this brothers doing his own thing. There is no team, and no one thinks about family anymore. What's worse, something dark and mysterious is taking place in New York City! Determined to find out what's going on, Leonardo tries to gather his brothers, Casey Jones, and April O'Neil against a formidable force of strange creatures -- Stone Generals and out-of-this-world monsters -- not to mention the sneaky Foot Ninja, and an obscure legend that is somehow dangerously real! it's up to the Turtles to save the world. But before that can happen, they must first come together as a team -- and as a family.