Kater Killer was a tracked box-wedge shaped robot which was entered by Team KaterKiller in Series 3 and 4 of Robot Wars. Kater Killer lost in the first round of both series it fought in, and also competed in the Sumo Basho competition, finishing in 6th place. Kater Killer's name is derived from 'caterpillar', after its caterpillar tracks, combined with a cat theme, used more strongly in the robot's successor, Kat 3.