Sheldon J. Plankton/appearances

Character

Gallery

Appearances

Bold means character played a Major role

Appearances = 67 episodes

Episodes

Season 1

1. Plankton! (debut)
2. Culture Shock
3. F.U.N.
4. Sleepy Time
5. Valentine's Day (cameo)
6. Walking Small

Season 2

1. Imitation Krabs
2. Christmas Who?
3. Welcome to the Chum Bucket
4. Band Geeks
5. The Fry Cook Games

Season 3

1. The Algae's Always Greener
2. Mermaid Man and Barnacle Boy IV (cameo at the ending)
3. Snowball Effect
4. Krusty Krab Training Video
5. Party Pooper Pants
6. Plankton's Army
7. The Sponge Who Could Fly
8. SpongeBob Meets the Strangler (non-speaking cameo)

Season 4

1. Fear of a Krabby Patty
2. Krabs vs. Plankton
3. Dunces and Dragons
4. Enemy In-Law
5. Mermaid Man and Barnacle Boy VI: The Motion Picture
6. Patrick SmartPants (speaking cameo)
7. Wishing You Well
8. New Leaf
9. Best Frenemies

Season 5

1. Friend or Foe
2. Spy Buddies
3. Krabs à la Mode
4. Bucket Sweet Bucket
5. Goo Goo Gas
6. Atlantis SquarePantis
7. Mermaid Man vs. SpongeBob
8. Pest of the West (ancestor Dead Eye Plankton)
9. 20,000 Patties Under the Sea
10. Banned in Bikini Bottom
11. Stanley S. SquarePants

Season 6

1. Krabby Road
2. Spongicus
3. Patty Caper
4. Plankton's Regular
5. The Krabby Kronicle
6. Komputer Overload
7. No Hat for Pat (cameo)
8. Chum Bucket Supreme
9. Single Cell Anniversary

Season 7

1. Truth or Square
2. Chum Caverns
3. Tentacle-Vision
4. Someone's in the Kitchen with Sandy
5. The Inside Job
6. Greasy Buffoons
7. SpongeBob's Last Stand
8. One Coarse Meal
9. The Play's the Thing (cameo)
10. Rodeo Daze
11. Gramma's Secret Recipe

Season 8

1. The Main Drain
2. The Great Patty Caper
3. That Sinking Feeling (speaking cameo)
4. Buried in Time
5. Shellback Shenanigans
6. Perfect Chemistry
7. The Other Patty
8. Drive Thru
9. Frozen Face-Off
10. Squidward's School For Grown-Ups (speaking cameo)
11. Sweet and Sour Squid
12. A SquarePants Family Vacation (cameo at the begining)
13. Walking the Plankton

Season 9

1. Plankton's Good Eye
2. The Krabby Patty That Ate Bikini Bottom
3. Fiasco!
4. Free Samples
5. Karen 2.0
6. For Here or To Go
7. It's a SpongeBob Christmas!
8. Squirrel Record (cameo)

Movies and Shorts

1. Plankton's Holiday Hits
2. The SpongeBob SquarePants Movie
3. Can't Swim
4. Remodeling
5. Loop dee Loop
6. Plankton Pays