Because she needs to prepare for the surprise party for Fred's birthday, Wilma asks Barney to drive Fred around all day. Things don't exactly go as planned after the two of them fall asleep.

Ann-Margrock (special guest star Ann-Margret, providing her own voice) comes to town for a big concert and stays with the Flintstones, who do not know who she is. After a few tries Fred and Barney both get on the Ann-Margrock Show.

Arnold the paper boy continues to annoy Fred as he is playing with Pebbles. He jokes that they will get married when they grow up. Fred then has a bad dream that Arnold grows up, becomes the local hero, takes his job at the quarry, his pride as a pool player and bowler, his friendship with Barney, and of course, marries Pebbles.