Kelly’s grandpa invites the whole clique to his little hotel “The Hideaway” in Hawaii for summer vacation. They expect a marvelous time at the beach without Belding. They soon discover that not only is Belding there, but that they must help Grandpa Harry: mean capitalist Worthington plans to ruin him to seize his land to build an apartment complex. Meanwhile, Zack meets (again) the love of his life; Jessie and Slater bet Lisa that they won’t fight; and Screech gets kidnapped by the Pupuku clan.