Enter: Mutagen Man - S5.E5

In the frozen tundra of the Arctic Polar Cap, Krang rants and raves that Rocksteady and Bebop will not return in time with the Bindex 3 to load the mutagen into the rocket ship's fuel tanks before lift off. Krang' plans turn all the City's inhabitants into horribly disfigured mutants from the vapor trails of the fuel used to lift the rocket.