SpongeBob SquarePants: Season 0, Episode 8

0 - 8: Friend or Foe

Plankton and Mr. Krabs have been enemies for a long time. However, Mr. Krabs reveals that they were not always this way and that they used to be friends. He then explains of how that all changed. Then Plankton tells his side of the story as well, and Karen reveals they are both lying and gives the true story of the feud that led to hatred.