The Flintstones in Viva Rock Vegas is a 2000 American family-romantic comedy film and prequel to 1994's The Flintstones based on the 1960s cartoon series of the same name, produced by Amblin Entertainment and Hanna-Barbera and distributed by Universal Pictures. Set before the Flintstones and Rubbles were married and had kids and the events of the first film, it featured very few of the original cast. Despite slightly more positive reviews than the first film, Viva Rock Vegas bombed at the box office.
Ann-Margret, who appeared as 'Ann-Margrock' in the original television series, sings the theme song, which is a slightly rewritten version of the theme song from Viva Las Vegas, in which Ann-Margret co-starred with Elvis Presley.
None of the Cast members from the first film appeared in this prequel.