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Sheldon J. Plankton

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Sheldon J. Plankton
Artwork of Plankton
General information
Gender: Male
Color: Green
Eye color: Red (pupils), yellow (sclera)
Species: Planktonic copepod[1]
Occupation(s): Manager of the Chum Bucket
Family: Karen Plankton (wife)
Grandma Plankton (grandma)
Clem Plankton (cousin)
Rupert Plankton (cousin)
Zeke Plankton (cousin)
Rufus Plankton (cousin)
Jeke Plankton (cousin)
Billy Bob Plankton (cousin)
Billy Jim Plankton (cousin)
Billy Billy Wo Willy Banana Fana Fo Filly Plankton (cousin)
Toad Plankton (cousin)
Enis Plankton (cousin)
Doug Plankton (cousin)
Leisha Plankton (cousin)
Joe Plankton (cousin)
Rainchild Plankton (cousin)
Marvin (cousin)
Gordon Plankton (father)
Mama Plankton (mother)
Grand Dad Plankton (grandpa)
Fredrick (father-in-law)
E.M.I.L.P. (mother-in-law)
Chip Plankton II (son) Unseen Uncle (uncle)
Friends: Mr. Krabs (formerly)
SpongeBob (sometimes)
Pet(s): Spot
Enemies: Mr. Krabs, SpongeBob, Squidward
Other information
Interests: Krabby Patty secret formula, creating inventions
Behind the scenes
First appearance: "Plankton!"
Portrayed by: Mr. Lawrence

Sheldon J. Plankton, often known as simply Plankton, is an intellectual, green plankton and the main antagonist of the SpongeBob SquarePants franchise. He manages the Chum Bucket, an unsuccessful restaurant located directly across the street from the Krusty Krab. Plankton is married to a computer, Karen Plankton. He is very short at only two inches[2] and can fit on the palm of a character's hand.

Plankton is the main enemy of Mr. Krabs, the manager of the Krusty Krab. He is also SpongeBob's main enemy, although to a lesser degree than Mr. Krabs. Plankton is jealous of the Krusty Krab's success, which is largely contributed to by its signature menu item, the Krabby Patty. Throughout the series, Plankton has tried numerous times to steal the Krabby Patty secret formula, sometimes with help from Karen, so that he can serve Krabby Patties over chum as a menu item. Plankton's schemes always end up in failure, usually from being thwarted by either Mr. Krabs or SpongeBob. Plankton is voiced by one of the show's writers, Mr. Lawrence.


  1. Plankton is referred to as a copepod in "Lame and Fortune"
  2. "Komputer Overload"