Sigmund falls in love with a canine named Fluffy. Meanwhile Zelda decides to clean the clubhouse and Slurp dresses up like a female movie star to try to lure Sigmund home.
Johnny and Scott bring Sigmund home to live in their clubhouse, but the sea monster is nearly discovered by Zelda and the Sheriff when Sigmund's monstrous brothers come looking for him.
Aunt Zelda goes to visit an ailing sister, leaving her humorless friend Gertrude in charge. Meanwhile, the boys are forced to contend with Sheldon's nephew, Shelby, who promptly turns Gertrude into a parrot.
Sheldon zaps Paul Revere into the clubhouse and then can't zap him home. Meanwhile, the Ooze family devises a scheme to swipe Sigmund's magic shell to help Blurp win back his girlfriend.
Sheldon makes Johnny and Scott invisible so they can avoid Zelda's niece, but the genie soon falls ill and can't seem to undo his spell. Meanwhile, Big Daddy runs for mayor of the monsters.