The Flintstones was a sitcom that ran on A-B-C from 1960 to 1966, making history as the first animated show to air in primetime. While the show has been off the air for decades, the Flintstones are still a regular fixture in many of our lives thanks to the continued success of a certain brand of breakfast cereals. In fact, it’s possible some people only know them as grocery store mascots, and have no idea the show ever existed.