NESRSPU-31L-CMPU 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 with four legs.

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