Rat King  is an immortal playing a game for control of the Earth located in the dimension occupied by the Teenage Mutant Ninja Turtles.
Rat King is one of the powerful immortals who once ruled the Earth thousands of years ago. He is brother to Kitsune and Chi-You. At some point, they mysteriously disappeared and inspired myth and legend. The Rat King inspired the Pied Piper of Hamelin folklore, a figure known to have rewarded and punished mankind. Ultimately, they fell from memory and man began to question if they ever really existed at all. The immortals agreed to a game to see who could regain control of Earth. Rules were drafted and only mortals could be used as their pawns.
For further information, see the Turtlepedia article for the Rat King.
The Rat King appears in the form of a gaunt, verminous man.
- The Rat King's first appearance in the Turtle IDW canon was in Issue #36 of its ongoing series.
- Teenage Mutant Ninja Turtles Ghostbusters
- ↑ Rat King (2014). IDW Comics- "Teenage Mutant Ninja Turtles #36]" (2013) (Comic p.6). 'Rat King says: "... You may call me the Rat King."