List of SpongeBob SquarePants characters
Sheldon J. Plankton is an evil green plankton. He and his talking computer, Karen, own a restaurant called the Chum Bucket. Plankton is an evil genius and Mr. Krabs' rival. His goal is to steal the secret recipe for Krabby Patties. The Chum Bucket is very unpopular and they never get customers. He is voiced by Mr. Lawrence.