Casey Jones VS. The Underworld

"Casey Jones VS. The Underworld" is The 14th episode of Season 3 and 66th overall. It aired on March 22nd, 2015

Official Description
Casey Jones thinks he can take on the criminal underworld on his own, but soon discovers that he is in over his head.

Characters

 * Leonardo
 * Donatello
 * Raphael
 * Michelangelo
 * April O' Neil
 * Casey Jones
 * Kirby O' Neil
 * Ice Cream Kitty
 * Karai
 * Shredder
 * Tiger Claw
 * Rahzar
 * Fish Face
 * Stockman Fly
 * Hun
 * Don Vizioso
 * Fulci Twins
 * The Purple Dragons

Trivia

 * First appearance of Hun, Don Vizioso and The Fulci Twins.
 * This is the first time Casey fights Shredder.
 * Leo fights Shredder solo for the first time.
 * For the first time Donnie hums the TMNT intro.
 * Auman Chemicals is named after one of the show's producers, Brandon Auman.
 * The Auman chemicals sign resembles the TGRI sign from the Turtles' 1991 live-action film.
 * One of the chemicals in the Chee-Z-Balls Red Dye 42 this is a reference to Red Dye 40 which is bad for kids who have hyper problems.
 * When Casey confronts Rahzar and Fishface, he says: "The class is pain 101, your instructor is Casey Jones", which is a line stated by Jones in the 1990 live-action film.
 * Hun's design is explicitly inspired by Bruce Lee.
 * In the back label of the Chee-Z Balls it is read "Organically Harvested Cheese Air - 0g" and "Food** to Air Ratio - 1/78", a joke about how snack bags are always half filled with air (to prevent the snacks from cracking).