In this episode, when Plankton's usual spot to dump his rotten chum is too full, he tricks SpongeBob into hiding it around the city. Plankton and Karen are the married owners of the unsuccessful Chum Bucket restaurant. Plankton are the diverse collection of organisms that live in large bodies of water and are unable to swim against a current. Sheldon J. Plankton, more commonly known as Plankton, is the main antagonist of the SpongeBob SquarePants franchise. He is a planktonic copepod and arch-competitor of Mr. Krabs. A picture of her appears in Plankton's kitchen. Acorrding to the episode friend or foe, plankton(or mr. krabs) said they were born on the same day. Plankton is an intellectual planktonic copepod and Karen is a waterproof supercomputer. "The Ghost of Plankton" She appears at her grandson's funeral and is shocked when Plankton becomes alive. List of characters. The individual organisms constituting plankton are called plankters. Trivia They provide a crucial source of food to many small and large aquatic organisms, such as bivalves, fish and whales. He runs a massively unsuccessful restaurant called the Chum Bucket alongside Karen, a waterproof computer who is his sidekick and wife.The Chum Bucket is highly unpopular in Bikini Bottom because … Plankton shares a rivalry with Mr. Krabs, who owns the far more profitable Krusty Krab restaurant and sells a fictional burger called the Krabby Patty. "Plankton's Old Chum" is a SpongeBob SquarePants episode from season twelve. So his birthdate is 11/30/1942(71 years old). Lily and the other attendees believe that Plankton faked his death as a cruel joke and start attacking him in anger.