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.
Johnny entertains at Zelda's bazaar by performing magic tricks (with sporadic assistance from Sheldon), while Scott displays his unicycling skills. Meanwhile, the Ooze family kidnaps Sigmund and tries to get him to join the Monster Militia.
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.