AllMovie

While attending the Stone Age World's Fair in Bedrock, the Flintstones and the Rubbles meet an eccentric scientist who has invented a time machine. Before they know what is happening, the foursome has been whisked into the distant future--that is to say, their future and our past! This leads to some memorable encounters with such historical celebrities as Nero, King Arthur, and Christopher Columbus, and ends up with Fred, Wilma, Betty and Barney being plunked in the middle of the 1964 New York World's Fair!