The Rat King, Nick Teenage Mutant Ninja Turtles 2012 Wikia

Dr. Victor Falco, later known as The Rat King, was a sleazy scientist who used his knowledge and talents for his own selfish gain. After an accident involving a fire, mutagen, and a chemical he was developing to give him telepathic powers, he became this series' incarnation of the Rat King. As a normal human, Falco wore a white lab coat, had gray hair with white markings, brown shirt and pants, and a tie. As the Rat King, his skin is pale green, his eyes glow red, he resembles a corpse, his teet

Ninja Turtles (2012 TV series), TMNTPedia

The Rat King/ Gallery, Teenage Mutant Ninja Turtles 2012 Series Wiki

Donatello, Nickelodeon

Watching all of Nick's TMNT 2012 for the 1st time Retrospective » MiscRave

Y'Gythgba, Nick Teenage Mutant Ninja Turtles 2012 Wikia

Let's make our own top 5 episodes lists according to categories - The Technodrome Forums

Teenage Mutant Ninja Turtles (Nickelodeon 2012) - The Rat King

Genghis Frog, Nick Teenage Mutant Ninja Turtles 2012 Wikia

Casey Jones (2012 TV series)

Enter The Rat King, Idea Wiki