Sheldon J. Plankton is the main antagonist of the Nickeloden TV Show SpongeBob SquarePants and it's first theatrical movie The SpongeBob SquarePants Movie. He is also the secondary antagonist, later anti-hero, later secondary antagonist again of it's theatrical movie The SpongeBob Movie: Sponge Out Of Water.
Physical Appearance[]
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Personality[]
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