The Ninja Rat is an unnamed character who appeared in the cartoon show episode "Karate Clumsy" of Season 9. He is a self-proclaimed expert at ninjitsu whose rodent minions have taken hostage a village of peaceful mice in ancient Japan and have also taken most of the time-lost Smurfs hostage to clean his house. Clumsy, who has escaped capture, eventually confronted the Ninja Rat with the help of Smoogle and Mouse Master.