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Tired of Raphael's constant criticism, Leonardo lets him try his hand at leadership, while Leonardo meets a female ninja, Karai, who tries to lure him to the dark side.
The Turtles must face off against a new enemy, The Rat King, who threatens not only to take control of the city, but of Splinter's mind as well.
The Turtles get their first look at high school when April's school project draws attention from the Kraang.