Noxious Enterprise's Super SPU-31 Liquid-Cooled Mobile Processing Unit, also known as SPU-31, is a robot that Plankton created to try to steal the Krabby Patty Secret Formula and replace Karen.
SPU-31 fought alongside the Command Module and the T-119A Compumatic, until Plankton joined the three robots to make one giant robot. SPU-31 made up the bottom of the robot. It looks like a blue glob of hair gel or water with four legs. This robot was only seen in the episode "Komputer Overload."