In SpongeBob, Plankton is a character who is the owner of the restaurant, the Chum Bucket, and his only objective in life is to steal his arch-rival Krabs secret Krabby Patty recipe. He is egotistical, aggressive, and power-hungry, and he is very jealous of Mr. Krabs and his success. Plankton is a green copepod, which is a type of zooplankton.