 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. Arrived there, the learn quickly that not only Belding s there too, but they also have to help grandpa against the mean capitalist Worthington, who plans to ruin him to get his land to build a new apartment house complex. Meanwhile Zack meets (again) the love of his live, Jessie and Slater bet with Lisa that they won t fight and Screech gets kidnapped by the Pupuku clan.