It has a large bubbly blue center with a substance in it, and has robot legs to hold itself up.
I can turn into a skyscraper!
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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."