Who was the main nemesis of SpongeBob's stingy boss, Mr. Krab?

It's true that Mr. Krab is no selfless boss, but he isn't scheming and conniving like his main rival, Sheldon Plankton. What is it that Plankton is after? The Krabby Patty secret recipe that makes Mr. Krab so successful. Plankton's attempts to steal the coveted morsel's recipe are thwarted, quite accidentally, by SpongeBob and his friends.

Asked by Jennifer Sinclair · Last updated 5 years ago · 17.2K views · SOURCE