plankton (spongebob)
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"Hear me, Krabs! When I discover your formula for Krabby Patties, I’ll run you out of business! I went to college!"
— PLANKTON'S FIRST LINES, IN THE EPISODE PLANKTON!
Sheldon J. Plankton, most commonly known as Plankton, is one of the ten main characters of the Spongebob Squarepants series. He is a planktonic copepod who runs the Chum Bucket restaurant alongside Karen, a waterproof computer who is his sidekick and wife. The Chum Bucket is highly unpopular in Bikini Bottom because it serves chum, a type of bait made from fish meat.
He is the central and main antagonist of the franchise. There are also several and many episodes in which Plankton acts as a sympathetic anti-hero. Plankton despises his rival, Mr. Krabs for running a successful restaurant because his own business rarely gets any customers. His main goal is to steal Krabs' secret formula for Krabby Patties and running Mr. Krabs out of business. Karen gives him a variety of plans to steal it, but their efforts always end up failing in the process.