BlackJack SquarePants

BlackJack SquarePants is the cousin of SpongeBob, Todd, Larry, and Stanley, and the main antagonist in the episode "BlackJack."

Description
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."

History
Too short. Please expand it.