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The Turtles are captured and thrown into the Triceraton Arena.
The team must overcome impossible odds in order to obtain the final Black Hole Generator piece.
Raphael's bonding with little Chompy gets interrupted by the invasion of Tokka, who has come to Earth searching for him.
When he gets upset, Mikey flees and befriends a mutant frog in the woods, only to learn the frog and his family have nefarious plans.
When Casey, Raph, Mikey and Donnie are captured by a new mutant, April and Leo must overcome disabilities in order to save them.
Leo takes the Turtles to train in the woods in an advanced ninja ritual; the Turtles must overcome their weaknesses and face their enemies to become a true ninja.
Michaelangelo plays with some mutagen, contracting a dangerous infection that mutates out of control.
April feels left out and insists on joining the Turtles on a mission to TCRI; a secret about April's past is revealed.
A fungus mutant spreads through the sewers causing April and the Turtles to experience their worst fears; Leonardo must face his greatest fear.
Leo regrets his act of mercy when Xever holds a local store owner hostage.
April receives a warning from her imprisoned father; the turtles try to stop Kraang from detonating a mutagen bomb in the city.
The turtles must split into two groups in order to face simultaneous threats from the Purple Dragons and Baxter Stockman's Mousers.
Leonardo lets Raphael try his hand at leadership; Leonardo meets a beautiful and dangerous female ninja.