BlackJack SquarePants is the cousin of SpongeBob SquarePants and Stanley SquarePants. He appears in the episode "BlackJack." He was voiced by John DiMaggio, who also voiced Dr. Drakken in Kim Possible (2002-2007), Pizza Face in TMNT, Fu Dog in American Dragon: Jake Long (2005-2007), and Jake the Dog in Adventure Time (2010-2018).

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