The animated stars of TV's The Flintstones make the leap to the big screen in this spoof of the spy genre. Because Fred Flintstone (voiced by Alan Reed Sr.) is the identical double of secret agent Rock Slag, he is enlisted by the Stone Age Secret Service to take over for Slag when the spy is injured. As a result, Fred, his wife Wilma (Jean vanDer Pyl), and their friends Barney (Mel Blanc) and Betty Rubble (Gerry Johnson) are sent to Paris, where Fred is ordered to find the head of the criminal organization SMIRK, the Green Goose. After following the Goose's trail to Rome, Fred and Barney are captured by the arch-villain, where it's up to Rock Slag to save the day.