The Rumpus cat is a character played by the cat Admetus. Munkastrap tells the story to Old Deuteronomy when he first arrives to the Jellicle Ball. He tells of how the Rumpus Cat can scare the Peeks and the Pollicles away. The costume of the Rumpus Cat has hair that is made to stand on end, Eyes that glow and a large R on his chest reminiscent of a superhero.