The Rat King
The Rat King first appeared in Teenage Mutant Ninja Turtles #4 (February 1, 1988).
A solitary madman, believing himself to be a monster, The Rat King lives in an abandoned factory and it’s surrounding swamp. During an encounter with the Teenage Mutant Ninja Turtles he believed them to be monsters that were coming to claim his home for themselves. The Teenage Mutant Ninja Turtles came to the factory, just to train with Casey Jones, and did not want it for themselves. Rat King first watched Teenage Mutant Ninja Turtles from the shadows, but after a while he captured Michelangelo and tried to feed him to rats. Michelangelo escaped and met with the other Turtles and Casey Jones. After failing to kill Michelangelo, Rat King attempted to kill all of the Turtles by feeding them alive to his army of rats. He failed and received a shiruken in his chest from Leonardo for his troubles. Rat King dropped in a silo because of the impact of Leonardo’s shuriken and was expected to have died.