Uka Uka acts as a hazard in the last boss fight, where he and Aku Aku are fighting, at first they zap each other with lasers and they rotate, then both of them form a whirlwind, and finally they blow up in a certain area after a short fight. Every time Cortex falls into the hole in the middle (except when the player has beaten Cortex) Uka Uka will stop fighting, go into hole, and carry out Cortex.