Sheldon J. Plankton

main antagonist in SpongeBob SquarePants

Sheldon J. Plankton is one of the ten main characters of SpongeBob SquarePants. He is a planktonic copepod who runs the Chum Bucket restaurant alongside with Karen, a waterproof robot who is Plankton's sidekick and wife. Plankton debuted in the episode "Plankton!", which aired on July 31, 1999.

Sheldon J. Plankton
'SpongeBob SquarePants' character
First appearancePlankton! (July 31, 1999)
Portrayed byMr. Lawrence
Wayne Knight (The SpongeBob SquarePants Movie)
OccupationBoss of the Chum Bucket
RelativesWife: Karen Plankton
Son: Chip Plankton II
Pet: Spot
Parents: Gordon and Mrs. Plankton
Grandparents: Grand Dad and Lily Plankton

Personality change

He gets a Krabby Patty and runs Mr. Krabs out of business. He went to college.