BlackJack (SpongeBob SquarePants episode)

BlackJack is the twenty-ninth episode of the fifth season and the one hundred and eighty-fourth episode of the series. In this episode, SpongeBob thinks his cousin BlackJack has kidnapped his parents.

Plot
SpongeBob receives a note from his cousin BlackJack, saying that he has been released from prison and is going to pay SpongeBob's parents a "visit." Grandma SquarePants soon appears and tells him that BlackJack had recently called her.

SpongeBob seeks help from his uncle, Captain Blue SquarePants, a retired police captain. SpongeBob goes in to confront his foe and save his parents, but it is revealed that his parents were never in any danger, and that they are holding a party for BlackJack to celebrate his release. They explain to SpongeBob that BlackJack has renounced his "criminal" ways of littering, and that their house was closed off due to a krill infestation. BlackJack then enters the room, still intent on beating up SpongeBob, but SpongeBob is now prepared to stand up for himself. As BlackJack charges at SpongeBob, it's revealed that BlackJack is no bigger than SpongeBob's foot, and that he can't any harm whatsoever.