Sheldon J. Plankton

"You married a genius, Karen!"

Sheldon J. Plankton, more commonly known as Plankton, is one of the ten main characters in the SpongeBob SquarePants franchise. He is a planktonic copepod who runs the Chum Bucket restaurant alongside Karen, a waterproof computer who is his sidekick and wife. The Chum Bucket is highly unpopular in Bikini Bottom because it serves chum, a type of bait made from fish meat.

Appearances

 * Spongebob Squarepants:

Plankton!

Culture Shock

F.U.N.

Sleepy Time

Valentine's Day (Non-speaking cameo)

Walking Small

Imitation Krabs

Life of Crime (Mentioned)

Christmas Who? (Cameo)

Welcome to the Chum Bucket

Band Geeks

The Fry Cook Games

The Algae's Always Greener

Mermaid Man and Barnacle Boy IV (Cameo)

Snowball Effect (Cameo)

Krusty Krab Training Video

Party Pooper Pants

Plankton's Army

The Sponge Who Could Fly

SpongeBob Meets the Strangler (Cameo)

Fear of a Krabby Patty

Krabs vs. Plankton

Dunces and Dragons (Medieval ancestor appears instead)

Enemy-in-Law

Mermaid Man & Barnacle Boy VI: The Motion Picture

Patrick SmartPants (Cameo)

Wishing You Well

New Leaf

Best Frienenemies

Friend or Foe

Spy Buddies

Krabs a la Mode

Bucket Sweet Bucket

Goo Goo Gas

Atlantis SquarePantis

Mermaid Man vs. SpongeBob

20,000 Patties Under the Sea

Banned in Bikini Bottom

Stanley S. SquarePants (Cameo)

Krabby Road

Spongicus

Patty Caper

Plankton's Regular

The Krabby Kronicle

Komputer Overload

Chum Bucket Supreme

Single Cell Anniversary

Truth or Square

Chum Caverns

Tentacle-Vision

Someone's in the Kitchen with Sandy

The Inside Job

Greasy Buffoons

SpongeBob's Last Stand

One Course Meal

The Play's the Thing (Non-speaking cameo)

Rodeo Daze

Gramma's Secret Recipe

Welcome to the Bikini Bottom Triangle

The Main Drain

The Great Patty Caper

That Sinking Feeling (Cameo)

Buried in Time

Shellback Shenanigans

Perfect Chemistry

The Other Patty

Drive Thru

Frozen Face-Off

Squidward's School for Grown-Ups (Cameo)

Sweet and Sour Squid

A SquarePants Family Vacation (Cameo)

Walking the Plankton

Plankton's Good Eye

The Krabby Patty That Ate Bikini Bottom

Fiasco!

Free Samples

Karen 2.0

For Here or to Go

It's a SpongeBob Christmas!

Super Evil Aquatic Villain Team Up is Go!

Chum Fricassee

The Good Krabby Name (Cameo)

Move It or Lose It

Hello Bikini Bottom! (Cameo)

Squirrel Record

Eek, an Urchin!

Jailbreak!

Evil Spatula

It Came from Goo Lagoon

Plankton's Pet

Company Picnic

Married to Money

CopyBob DittoPants

Lame and Fortune

Goodbye, Krabby Patty?

Pineapple Invasion

Salsa Imbecilicus

Mutiny on the Krusty (Cameo)

Mimic Madness

House Worming

Plankton Gets the Boot

Burst Your Bubble

Plankton Retires

The Incredible Shrinking Sponge

Feral Friends (Deleted scene)

Spot Returns

Spin the Bottle

The Legend of Boo-Kini Bottom

No Pictures Please

Krabby Patty Feature

Teacher's Pests

Fun-Sized Friends (Mentioned)

Grandmum's the Word

Bottle Burglars

Shopping List

Patnocchio

Plankton Paranoia

Call the Cops

Surf N' Turf

Appointment TV

Karen's Virus

The Grill is Gone

Girls' Night Out

Gary & Spot

The Krusty Slammer

King Plankton

Plankton's Old Chum

The Krusty Bucket

Sandy's Nutty Nieces (Likeness only)

Karen's Baby

Senior Discount

SpongeBob's Big Birthday Blowout

Handemomium

The Ghost of Plankton

My Two Krabses

Hiccup Plague (TBA)

The Hankering

Who R Zoo?

Plankton's Intern (TBA)

Plankton's Holiday Hits

Can't Swim

Remolding

Loop dee Loop

Plankton Plays

SpongeBob's Legendary Dance (Cameo)

Plankton's Color Nullifier

Astrology with Squidward: Leo

Plankton's Plan

Holiday Party

How The You-Know-Who Stole You-Know-What!

Plankton's Diary: Karen

Plankton's Diary: Evil Laugh

Plankton's Diary: Plankton's Evil Plan

SpongeBob Checks His Snapper Chat

How to Party Like SpongeBob

Fish Food Rescue: The Krusty Krab

The Museum of Cartoon Sponges

Home Sweet Home

Reef BFF's

Sea Food and Eat It

Plankton. A Thank You Would Be Nice.

Nick Takes Over the Super Bowl


 * The SpongeBob SquarePants Movie
 * The SpongeBob Movie: Sponge Out of Water
 * The SpongeBob Movie: Sponge on the Run (Unreleased)

Relationships
Family


 * Planktonamor ☠- Ancestor
 * Dead Eye Plankton ☠- Ancestor
 * Grand Dad Plankton ☠- Paternal grandfather
 * Lily Plankton- Grandmother
 * Silas Plankton- Paternal uncle
 * Clem Plankton- Cousin
 * Joe Plankton- Cousin
 * Billy Bob Plankton- Cousin
 * Rufus Plankton- Cousin
 * Billy Jim Plankton- Cousin
 * Billy Billy Bo Billy Banana Fana Fo Filly- Cousin
 * Doug Plankton- Cousin
 * Enis Plankton- Cousin
 * Fletcher McGee- Cousin
 * Rainchild- Cousin
 * Jeke Plankton- Cousin
 * Flem Plankton- Cousin
 * Julio Plankton- Cousin
 * Timmy Plankton- Cousin
 * Zeke Plankton- Cousin
 * Marvin- Cousin
 * Gordon Plankton- Father
 * Mama Plankton- Mother
 * Seymour Plankton- Great-grandfather
 * Basia- Parental great-grandmother
 * Moe Bros
 * Alvin- Granduncle
 * Karen- Wife
 * Chip I- Grandfather-in-Law
 * Fredrick- Father-in-Law
 * E.M.I.L.P.- Mother-in-Law
 * Chip Plankton II- Son
 * PlanKrab ☠- DNA donor
 * Red PlanKrab ☠- DNA donor
 * Green PlanKrab ☠- DNA donor
 * Spot- Pet
 * Plankton's Lab- Pet
 * Betsy Krabs (Former girlfriend)

Allies


 * Karen- Sidekick
 * SpongeBob SquarePants (Sometimes)
 * Patrick Star (Sometimes)
 * Squidward Tentacles (Sometimes)
 * Mr. Krabs (Sometimes)
 * Sandy Cheeks (Sometimes)
 * Dennis
 * Zim (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Dib Membrane (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Danny Phantom (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Technus (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Jimmy Neutron (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Beautiful Gorgeous (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Tak (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Tlaloc (SpongeBob SqaurePants featuring Nicktoons: Globs of Doom)
 * Scout
 * Super Scout
 * Turret
 * Mortar
 * Buzzbot
 * Rocket
 * Robo-Squidward ☠
 * Robo-Patrick ☠
 * SpongeBot SteelPants ☠
 * Robo-Plankton
 * Man-Ray (Formerly)
 * Karen 2.0 (Formerly) ☠
 * Vlad Masters (Nicktoons Unite!)
 * Professor Calamitous (Nicktoons Unite!)
 * Mr. Crocker (Nicktoons Unite!)
 * Critter (Formerly)
 * Flinger (Formerly)
 * MERV
 * Spawner ☠
 * Purple cellmate
 * Reggie Toothy
 * Squid cellmate
 * Light blue cellmate
 * Whale cellmate


 * T-119A Compumatic ☠


 * SPU-31 ☠
 * Command Module ☠
 * Cave dwellers (Formerly)

Enemies


 * SpongeBob SquarePants (Sometimes)
 * Patrick Star (Sometimes)
 * Squidward Tentacles (Sometimes)
 * Mr. Krabs
 * Sandy Cheeks (Sometimes)
 * Karen (Sometimes)
 * Gary the Snail
 * Pearl Krabs
 * Burger Beard
 * SpongeGlob (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Auto-matrix GIR (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Girl-eating plant (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Globulous Maximus (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Mutated giant Bubble Bass (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Vessel of Portentia (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Goo Flower (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Juju Vendor (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Almighty Tallest Red (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Almighty Tallest Purple (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * 4 Eyed Goo (SpongeBob SquarePants featuring Nicktoons: Globs of Doom)
 * Betsy Krabs
 * Fangtooth fish
 * Yeti Krabs
 * Flying Dutchman
 * Jellyfish
 * Walter the Waiter
 * Chum Bucket glove
 * Santa Claus
 * Lion fish
 * Cave dwellers