Ninjitsu was a competitor robot from Orange, California, that fought in the second season of Robot Wars: Extreme Warriors and Nickelodeon Robot Wars. In Extreme Warriors, it fought exclusively in the Robot Rebellion, reaching the second round before losing to Snookums on a close judges' decision. In the Nickelodeon series, it finished third in the US Championship after initially losing its eliminator to Tyranabot, and won the Battle of the Spinners against Destructive Criticism.