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Sheldon Plankton (voiced by Mr. Lawrence) and Karen Plankton (voiced by Jill Talley) are the owners of the Chum Bucket, an unsuccessful restaurant located across the street from the Krusty Krab. Their business is a commercial failure because they sell mostly inedible foods made from chum. Plankton is a small planktonic copepod and the self-proclaimed archenemy of Mr. Krabs. He is a skilled inventor and possesses a Napoleon complex due to his short stature. Karen is Plankton's own invention, a waterproof supercomputer who supplies him with evil plans to steal Krabs' secret recipe for Krabby Patties. She is married to Plankton and usually takes residence in the Chum Bucket laboratory.