The Flintstones: On the Rocks

The Flintstones visit a family therapist to repair their faltering marriage. The session ends in a physical altercation between Fred and Wilma, underscoring the volatility of their relationship. The therapist struggles to keep control as the couple's issues spill into the room.

On their anniversary, which both forgot, the Rubbles arrange a trip to Rockapulco to try to save the marriage. Fred and Wilma join Barney and Betty on what is meant to be a relaxing vacation. The stage is set for a getaway filled with misadventures.

A thief named Xavier steals a diamond from a jewelry store and is chased into the same hotel where the Flintstones and Rubbles are staying. The robbery injects danger into their vacation and creates a tense dynamic among strangers. The hotel becomes the focal point of the escalating chaos.

Xavier's bag is swapped with Wilma's, and he begins plotting to get the diamond back. Wilma, initially furious at Fred, discovers the diamond in her suitcase and assumes Fred bought it as a surprise gift. She makes up with Fred, at least temporarily, setting up a fragile truce.

Fred goes along with the ruse to appease Wilma, but their renewed passion fades as Fred's old mannerisms resurface. Wilma's trust wavers, and their reconciliation remains conditional on the shimmering diamond. The fragile peace barely holds.

Xavier disguises himself as a suave Englishman to seduce Wilma, inviting her to dinner and spending time with her. Wilma is drawn into the improvised romance, testing Fred's loyalty. The seed of trouble is planted as Xavier's true intent remains hidden.

Guilt-ridden, Fred tries to repair the relationship but catches Wilma in a moment with Xavier and is heartbroken. He drowns his sorrows at the hotel bar, speaking with another woman as he pretends to drink away the pain. Wilma's loyalty wavers as she weighs Xavier's charm against Fred's love.

During a ballroom dance, Wilma initially resists Xavier's advances but soon succumbs after seeing him with another woman. Xavier reveals his true plan and tries to steal the diamond from Wilma, who wears it as a necklace. A wild chase erupts as Fred, Barney, and Xavier scramble to recover the gem.

Xavier abducts Wilma and flees in his car, triggering a pursuit that leads toward a bridge above a volcano. Fred and Barney chase through the resort, risking everything to save Wilma. The stakes are raised as the jewel becomes the focal point of the showdown.

On the volcanic bridge, Xavier threatens to kill Wilma if she does not hand over the diamond. Fred delivers a heartfelt speech about how he is rich in love, not wealth, and his words momentarily shake Xavier. The confrontation ends with Xavier punching Fred unconscious.

Wilma defeats Xavier in a scuffle and the policewoman Xavier was avoiding arrests him. Fred regains his composure and the couple reaffirms their restored marriage. The immediate danger passes as order is restored.

With the crisis resolved, Fred and Wilma enjoy the rest of their trip, reaffirming their love. Barney and Betty observe their friends' passion and begin to bicker about their own marriage. The vacation ends on a note of renewed commitment.

Over the end credits, Dino guards the Flintstones' home but makes a mess and leaves the house in the care of friends before setting off on his own trip. The epilogue hints at ongoing domestic chaos and the carefree life they lead.