The Turtles discover for the first time that they are not the weirdest things in New York when they encounter two villains from the Hidden City pursing a cat-like agent. They have their first encounter with Baron Draxum who is making mutants with the help of his Oozesquitos.

In order to save April's job as a party captain at Albearto's Pizzeria, Donnie upgrades the main animatronic of Albearto, only for it to go out of control.