If you were looking for the article about the episode, then see BlackJack.
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BlackJack[1] (possibly BlackJack SquarePants) is the muscular cousin of SpongeBob, Todd, and Stanley, and is the main antagonist in the episode "BlackJack."


As kids, BlackJack was much larger than SpongeBob. However, when he met SpongeBob again, he was only the size of SpongeBob's big toe. It is likely that he stopped growing when he was young, as evident by SpongeBob saying that he hasn't changed a bit. BlackJack has a very gruffly voice and is circled shaped, compared to SpongeBob's square shape and he also has very muscular arms for his small size. On his arms are blue colored anchor tattoos. He dresses up in Biker-Gang clothing (white shirt, red wristbands, blue jeans with belt buckle like SpongeBob's, and black cowboy-like boots). He has shiny black hair, a pet worm, and lives in a cabin-like house only next door to his Uncle Blue SquarePants' house. BlackJack is known to be tough.


Prison time

BlackJack went to prison for littering, but was released from prison during the events of "BlackJack."


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I can turn into a skyscraper!
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SpongeBob SquarePants

Cousin BlackJack is older and tougher than SpongeBob, and he used to be a bully to him and both of them had a sibling rivalry with each other. BlackJack also calls SpongeBob a "little man," not just because SpongeBob is younger than him, but due to the fact that SpongeBob used to not make any attempt to duel with him, and used to become scared stiff.


BlackJack is known to be a powerhouse. SpongeBob's parents were not scared of him at all. In fact, they find it fun that they play and chat together. Captain Blue SquarePants was very scared to learn that BlackJack was out of prison (even though they are neighbors) and quick to flee to his home after dropping off SpongeBob.


  • It is unknown how or why BlackJack has stopped growing.
  • He is named after the card game Blackjack.
  • BlackJack is the only relative known to SpongeBob to have been sent to jail for criminal activity so far.

See also


Sponges (VE)

BlackJackCaptain Blue SquarePantsDrifterEnsignGirly TeengirlGrandma SquarePantsGrandpa SquarePantsHarold SquarePantsMargaret SquarePantsPrimitive SpongeSherm SquarePantsSpongeBob's GrandsonSpongeBob SquarePantsSpongeBoySpongeBuck SquarePantsSpongeGarSpongeTronSpongy SpongyStanley S. SquarePantsTodd SquarePantsSpongeBob's Great GrandmotherSpongeBob's Great Great Grandmother

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