| Character Information
Lisa first met Dean and his friends under the pier. Lisa quickly became friends with them, hanging out together, whilst Lisa taught them stuff about the sea and sealife. When Bart tried to win them over as his friends by performing skateboard tricks, Dean wasn't impressed as he thought Bart put in too much effort. Later, when Lisa was showing her new friends hermit crabs, she called them crustaceans. Dean asked if Lisa learned that word from a teacher, but Lisa said she learned it from Baywatch.
When Lisa and her friends were hanging out on the Fourth of July, Dean mentioned that his mother was French so they only celebrated Bastille Day. Lisa then suggested they threw a party on the beach and Dean said he knew where to get some baguettes. During the party, Bart showed all of Lisa's friends that she was a nerd. To show Lisa that they still liked her, Dean and his friends decorated the Simpsons' car with shells. Dean told Lisa that she taught them about cool stuff like nature and why they shouldn't drink sea water.