This article lists the members of the Plankton family.
|Planktonamor||Karen the Crystal Ball|
|Dead Eye Plankton|
|Grand Dad Plankton||Ella Plankton||Moe Bros||Alvin||Chip I (possibly)||Chip I (possibly)|
|Silas Plankton||Gordon Plankton||Mama Plankton||Fredrick||E.M.I.L.P.|
|Clem, Rupert and other Cousins of Sheldon||Sheldon J. Plankton||Karen Plankton|
|Chip Plankton II|
Planktonamor is a medieval ancestor of Plankton, who is an evil wizard and appears in the episode "Dunces and Dragons." He was the owner of the medieval king jellyfish, who he would send out to destroy the town unless King Krabs gave him the power. After kidnapping Princess Pearl, SpongeBob was sent out to fight him to the death, winning by stepping on him.
Karen the Crystal Ball
Karen the Crystal Ball is a medieval ancestor of Karen, who is an all-seeing crystal ball married to Planktonamor. She shows Plankton where his enemies are on her screen.
Dead Eye Plankton
Dead Eye Plankton is Plankton's western ancestor, who is an outlaw and appears in "Pest of the West." Everyone in Dead Eye Gulch is afraid of him. He uses a whip to threaten the citizens of the town. He brought down from power when SpongeBuck SquarePants stepped on him.
Sheldon J. Plankton
Sheldon J. Plankton a green planktonic copepod who is Mr. Krabs' business rival. He runs an unsuccessful restaurant called the Chum Bucket alongside Karen, a waterproof supercomputer who is his sidekick and wife.
Karen Plankton is Plankton's sidekick and wife who supplies him with evil plans to steal the Krabby Patty secret formula. She is a waterproof supercomputer who lives in the Chum Bucket laboratory.
Clem is the main cousin of Plankton. He is a hillbilly and has a hole in his hat for his antennae. It is mentioned that he cannot read.
Rupert is Plankton's country cousin. Unlike the others, he is orange.
Plankton's cousins include:
- Clem Plankton
- Zeke Plankton
- Rufus Plankton
- Jeke Plankton
- Billy Bob Plankton
- Billy Jim Plankton
- Billy Billy Bo Willy Banana Fana Fo Filly Plankton
- Toad Plankton
- Enis Plankton
- Doug Plankton
- Leisha Plankton
- Joe Plankton
- Rainchild Plankton
Papa Plankton is Plankton's father who appears in the book Hooray for Dads! Mr. Plankton is also mentioned in "Frozen Face-Off" when Plankton brings up that his dad thought he should have minored in business administration.
- Nicktoons Unite! and Creature from the Krusty Krab. Plankton even kept claiming that she would be proud of him if he took over the world and appreciate him more. Mama Plankton is Plankton's mother. She is mentioned in the video games
Grand Dad Plankton
Grand Dad Plankton is Plankton's grandfather who appears in "One Coarse Meal." Plankton sees him when he dreams of being eaten by Pearl. From the fact that Plankton saw him in a whale's stomach, he was eaten by a whale.
Fredrick is Karen's father and Plankton's father-in-law. He tends to like drinking English tea, but not to like the husband his daughter married Plankton. He has not appeared in an actual episode, but is a character who won in a contest in Nick Magazine. He appears in the December 2009 issue of Nick Mag.
E.M.I.L.P. is Karen's mother and Plankton's mother-in-law. Like Fredrick, E.M.I.L.P. does not like Plankton, saying that she wished Karen married an ATM, a person with money, instead of him. She appears in "Single Cell Anniversary" after Karen short-circuited. She is just like her husband Fredrick.
Chip Plankton II
Chip Plankton II is the son of Sheldon J. Plankton and Karen Plankton. He made his appearance in "Karen's Baby", during his life he grew up into different computer systems: a calculator (baby), handheld payment terminal (child), video game console (teenager), computer (young adult), and ATM (adult).