He took over from Season 7 starting with "One Coarse Meal" through mid Season 9 to help the real Plankton get the Krabby Patty secret formula. Starting in Season 9 he and the real Plankton alter places like the other characters. Like Slickward, the new writers at Viacom Inc. love torturing him.
He is less evil then the real Plankton and more obsessed and insane about the secret formula. He makes less eviler plans then the real Plankton. Mr. Kraps likes to torture him and take customers away from him even if it's only just one. He is afraid of whales. He is also a lot dumber than Plankton.