Sheldon J. Plankton is the main antagonist of SpongeBob SquarePants. He is voiced by Doug Lawrence. He is the owner of the Chum Bucket restaurant. He also lives there.


  • Species: Plankton
  • Skin Color: Green
  • Birthday: November 30, 1942
  • Age: 41 years old (adult)
  • Friends: Karen (wife), Neptune (formerly), Spot (pet), Dennis (hitman), 1000000 cousins
  • Enemies: SpongeBob, Patrick, Squidward, Mr. Krabs, Sandy. Larry, Pearl, Mrs. Puff, Neptune, Mindy, Gary

Counterparts (Boy Version)

Counterparts (Girl Version)

  • Daisy (Thomas the Tank Engine and Friends)
  • Wendy "Kootie Pie" O. Koopa (Super Mario Bros.)
  • Breezie (Sonic the Hedgehog)
  • Mandy (The Grim Adventures of Billy and Mandy)
  • Buttercup (The Powerpuff Girls) (Both are Green angry and Idiots)
  • Elmyra Duff (Tiny Toon Adventures)
  • Witch Hazel (Looney Tunes)
  • Karen (SpongeBob SquarePants)
  • Suzy Johnson (Phineas and Ferb)
  • Smoochum (Pokemon)
  • Heather (Total Drama)

Sheldon J. Plankton/Thomas