"The Flintstones in Viva Rock Vegas" has dinosaurs that lumber along crushing everything in their path. The movie's screenplay works sort of the same way. Think of every possible pun involving stones, rocks and prehistoric times, and link them to a pea-brained story that creaks and groans on its laborious march through unspeakably obvious, labored and idiotic humor.
This is an ideal first movie for infants, who can enjoy the bright colors on the screen and wave their tiny hands to the music. Children may like it because they just plain like going to the movies. But it's not delightful or funny or exciting, and for long stretches, it looks exactly like hapless actors standing in front of big rocks and reciting sitcom dialogue.
The story isn't a sequel to "The Flintstones" (1994), but a prequel, recalling those youthful days when Fred and Wilma Flintstone first met and fell in love. Fred is portrayed this time by Mark Addy, the beefiest of the guys in "The Full Monty." His best pal Barney Rubble is played by Stephen Baldwin, who recites his lines as if he hopes Fred will ask him to come out and play, but is afraid he won't. As the movie opens, Fred and Barney have gotten jobs at the rock quarry and settled down to a lifetime of quarrying rocks, which their world does not seem to need any more of, but never mind.
Meanwhile, in a parallel plot, Wilma Slaghoople (Kristen Johnston) resists the schemes of her mother (Joan Collins) to get her to marry the millionaire Chip Rockefeller (get it?). Fleeing her rich neighborhood, she ends up working in a drive-in restaurant (Bronto King) with Betty O'Shale (Jane Krakowski), and soon the two of them have met Fred and Barney.