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.

A new and unfamiliar mutant known as Muckman begins to gain notoriety as New York City's "Monster Hero."

Raphael meets a confused alien dinosaur named Zog, the Triceraton.

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Don Vizioso's gang tracks the Turtles with a slew of Anti-Mutant weapons.

When Mona Lisa suddenly arrives on Earth, Raphael must get her and Bishop to work together to defeat an alien threat and save the Earth

The Newtralizer returns to New York City, more powerful than ever before, and joins forces with a dangerous and unexpected ally. With the help of Raphael's Salamandrian girlfriend, Mona Lisa, the Turtles fight back to defend their city.