The Flintstones: On the Rocks

Plot

Fred and Wilma Flintstone's marriage is in trouble, so they go to a family therapist. Wilma has grown fed up with Fred's behavior, especially since their neighbors Barney and Betty Rubble seem to be thriving in their own relationship. The therapy session ends badly, with the couple getting into a physical fight. Later, both Fred and Wilma forget their own anniversary. Hoping to help, the Rubbles plan a trip for them to Rockapulco.

Once they arrive, a thief named Xavier steals a diamond from a jewelry store. A guard chases him into the same hotel where the Flintstones and Rubbles are staying. During the commotion, Xavier's bag gets swapped with Wilma's. He immediately starts scheming to recover the diamond. At first, things between Fred and Wilma remain tense—Wilma nearly decides to divorce him after lashing out. But then she finds the diamond in her suitcase. Assuming Fred bought it as a surprise gift, she quickly forgives him. Fred plays along with the misunderstanding, but the renewed passion fades fast when his old attitude starts bothering Wilma again.

Xavier, spying on Wilma, notices the trouble. He disguises himself as a smooth-talking Englishman and invites her to dinner. Wilma accepts and spends time with him. Meanwhile, Fred feels guilty and wants to make things right. But when he spots Wilma with Xavier from a distance, he is heartbroken. He starts drinking heavily and talks to another woman at the bar. Wilma initially rejects Xavier's advances out of loyalty to Fred, but changes her mind after seeing Fred with the other woman. As they dance, Xavier reveals his real goal: he tries to snatch the diamond from Wilma, who is wearing it as a necklace. A wild chase breaks out across the ballroom, with Fred, Barney, and Xavier all scrambling for the gem. The diamond ends up back in Wilma's hands, so Xavier kidnaps her and speeds away in his car.

A car chase follows, ending on a bridge over a volcano. Xavier threatens to kill Wilma unless she gives him the diamond. Fred shows up and delivers an emotional speech. He admits he never realized that, even though he could not afford to buy the diamond, he is still the richest man in the world simply because Wilma is his wife.