|Things have certainly come a long way. When Wilma was "with child", the word "pregnant" wasn't even allowed to be used on television; now we actually get to see Pebbles screaming her lungs out in the delivery room!!! Plus, this movie is full of prehistoric celebrity cameos galore.
Things start with the Rubbles and Flintstones getting the news that they are gonna be grandparents and heading out to Hollyrock to visit the kids. Pebbles is busy with her advertising career, while Bamm-Bamm is trying desperately to sell his screenplay -- and neither is prepared to deal with a month-long visit from their smothering parents. As Wilma and Betty take over preparations for the baby, Fred and Barney set out to sell Bamm-Bamm's screenplay -- against his wishes.
Fred starts stalking actress Shelly Millstone, trying to peddle the screenplay, and inadvertently gets his bowling ball switched with a giant stolen pearl -- inciting the wrath of a crime boss. Meanwhile, Pebbles and Bamm-Bamm are frustrated with their mothers taking control of their life and home, all while Pebbles is working so hard trying to promote a new film.
At the conclusion of the movie -- which includes a mad chase through Hollyrock involving a motor home, a tour bus full of sightseers, a purloined bicycle, an irate painter on foot, and Fred's screaming mother-in-law -- Pebbles finally makes it to the hoospital and gives birth to twins, tow-headed Roxy -- who inherits her father's strength, and redheaded Chip.