Fred’s old friend Gus Gravel invites the Flintstones and Rubbles to his seaside hotel for an all-expense-paid vacation. However upon arriving, the foursome finds that the hotel’s planned “activities” seem more like work, because the entire hotel staff has quit their jobs just prior to the foursome’s arrival. Gus finally confesses the truth to his four new guests, adding further bad news in that a huge convention is about to arrive, and Gus needs the Flintstones and Rubbles to stay on and work as hotel staff!