Plankton

Plankton (Sheldon J. Plankton) is the main antagonist of SpongeBob SquarePants, a tiny green copepod who runs the failing Chum Bucket restaurant and constantly tries to steal the Krabby Patty secret formula from his rival, Mr. Krabs, to put him out of business. He is often assisted by his computer wife, Karen, and is known for his elaborate, yet always failing, schemes for world domination and business success. Despite his villainous role, he sometimes acts as an anti-hero, notably in The SpongeBob Movie: Sponge Out of Water.