Sheldon J. Plankton

Sheldon J. Plankton is the main antagonist of the SpongeBob SquarePants franchise. He is the owner of the Chum Bucket, alongside his computer wife, Karen, which is across the street from the Krusty Krab. Due to this, Plankton had become the business arch rival of Krusty Krab's owner, Eugene Krabs. He attempts to steal the Krabby Patty secret formula in order to drive Krabs out of business and aim for world domination. It is revealed in the season 5 episode, Friend or Foe that he and Mr. Krabs were friends before a falling out caused them to become bitter enemies. 
Category:SpongeBob SquarePants characters
Category:Main antagonists
Category:Nickelodeon characters
Category:Villains
Category:Anti-villains
Category:Anthropomorphic characters
Category:Adults
Category:Males
Category:Spouses
Category:Lovers
Category:Nicktoons characters