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Character name is... Plankton
Sheldon J. Plankton (born November 30, 1942; age 74) is Mr. Krabs' arch-nemesis and the main antagonist in the SpongeBob SquarePants television series as well as The SpongeBob SquarePants Movie. He is also the largest protagonist villain, although in some episodes that mainly focus on him, he is not portrayed as an antagonist/villain.
He operates a failing restaurant called the Chum Bucket, located directly across the street from the Krusty Krab. His primary goal is to steal the Krabby Patty secret formula and put Mr. Krabs out of business. Plankton succeeds at stealing the recipe in the movie, but his goal of world domination is thwarted by SpongeBob. In "Friend or Foe," it was revealed that Mr. Krabs and Plankton were briefly best friends during their childhood, but a dispute over the Krabby Patty secret formula ended their friendship.
Sheldon J. Plankton was born as the only known child of Mama and Papa Plankton, and is the grandson of Grandma Plankton. He was born on November 30, 1942. This is also the birth date of his former best friend and current rival Eugene H. Krabs.
When they were kids, Plankton and Krabs were considered outcasts by other kids because Krabs was poor and Plankton was a nerd. When they discovered that money could bring them out of their poverty, they decided to make money selling hamburger patties, and set up a mini-restaurant in the local dump. At first, their burgers were not successful; the first of their patties were tried by Old Man Jenkins, who was knocked out by the contaminated burger. Plankton started complaining about how Jenkins had been old and not able to handle the patty. Offended by this, Krabs tried to take the recipe from Plankton to improve upon. Plankton wanted to do this himself and both him and Krabs argued, but he only ended up with the corner of the recipe, which read: "And a pinch of chum." Plankton stormed out of the restaurant, and went to create his own recipe, using only his memory, the corner of the recipe, and science. At school, Plankton tried to sell his chum burgers in a chum bucket and failed, while Krabs succeeded with his Krabby Patties, which he had created by accident when Plankton had slammed the door. Ingredients fell in the patty batter, thus creating the patty. Plankton later named his restaurant the Chum Bucket, after the secret ingredient of the original unsuccessful patty recipe. Mr. Krabs named his restaurant the Krusty Krab, after himself.