The multitalented Ann-Margret lends voice to her stone-age cartoon counterpart "Ann-Margrock" as The Flintstones launches its fourth season. Ann-Margrock is coming to Bedrock to stage a big musical show, and Fred and Barney hope to perform a vaudeville turn in the festivities. Just before the boys' audition, they come face to face with Ann-Margrock herself--and, failing to recognize the superstar, Fred hires her as babysitter for his infant daughter Pebbles. The episode is highlighted by Ann-Margret's soulful renditions of the original lullaby "The Littlest Lamb" and the all-stops-out rock tune "I Love You But I Ain't Gonna Be Your Fool."

After being bested by Arnold the newsboy in a table tennis game, Fred is in no mood to see Arnold kitchy-kooing the Flintstones' baby daughter Pebbles. What if, Fred wonders, Pebbles and Arnold should get married when they grow up. A subsequent dream sequence offers this very scenario, as a stooped and aged Fred Flintstone scurries all over Bedrock to prevent the wedding. Although the voice of the older Pebbles is provided by Janet Waldo in this episode, it would be Sally Struthers who assumed this role in the 1971 Flintstones animated spinoff Pebbles and Bamm-Bamm.

As they watch their neighbors Fred and Wilma lavish affection on newborn daughter Pebbles, Barney and Betty wish that they could have a child of their own--in fact, they wish upon a falling star, and you know what THAT means! The next morning a baby is left on the Rubbles' doorstep, a child so precociously strong that the Rubbles name him Bamm-Bamm. Hoping to adopt the baby, Barney and Betty are thwarted by wealthy Bronto Berger, who hires famed attorney Perry Masonry to claim custody of Bamm-Bamm for himself.

Although it is the first anniversary of the day that the Flintstones adopted Dino as their pet, Fred and Wilma forget all about the occasion as they continue to lavish affection upon their newborn baby Pebbles. Heartbroken, Dino runs away from home, leading Fred and Barney on a not-so-merry chase. Ultimate, the boys come with Dino in tow...or at least, it sure looks like Dino. Watch for a "subtle" plug on behalf of Mattel Toys' new "Baby Pebbles" doll.

Although Fred insists loudly that he doesn't need glasses, Wilma insists even more loudly that he pay a visit to the local optometrist. Reluctantly, Fred agrees to don the spectacles which the doctor has prescribed for him. Unfortunately, he puts on the wrong pair, and ends up mistaking a trained circus monkey for his baby daughter Pebbles!

Hoping to land a spot on the musical TV series "Hum Along With Herman" (a spoof of the popular 1960s show Sing Along With Mitch, designed for viewers who can't remember the words!), Fred forms his own barbershop quartet, the Flintstone Canaries. Fortunately, lead singer Barney is blessed with a gorgeous tenor voice. Unfortunately, Barney can only sing when he's sitting in the bathtub--outside the tub, he can't carry a note in a washbucket! This episode is highlighted by harmonic renderings of the traditional "Old Folks at Home" and a newly-minted jingle for "Hum Along With Herman"'s sponsor, Softsoap.

Just as he'd done in the previous season's episode "Invisible Barney", Fred has created a new soft drink in his garage "lab." As a drink, the concoction is a bust, but it does turn out to be a powerful, permanent glue. Unfortunately, the sticky substance ends up welding both Fred and Barney to the same bowling ball. Voice actor Allan Melvin, herein making his Flintstones debut, was at the time this episode was filmed also provided the voice for another Hanna-Barbera creation, Magilla Gorilla.

While playing in an important game for the Bedrock Quarry baseball team, Fred inadvertently switches uniforms with the team's star player, rookie Roger. However, the switch is made after Roger is spotted by a big-league scout--so naturally, it is Fred who is assumed to be the winning player. At first protesting the error, Fred begins to relish the notion of a big-league contract. . .while his friends and family members react with disgust over his willingness to live a lie. (Trivia note: "Roger" is named for New York Yankees star Roger Maris; other character names in this episode include "Casey", as in Stengel, "Leo", as in Durocher, and "Warren", as in Spahn).

This is the only episode in which the oft-ignored Betty Rubble is made center of attention (though it still doesn't earn her her own "designer" pill in the Flintstones Vitamin bottle!) Hoping to raise enough money to purchase a gift for her husband, Betty disguises herself as "Mrs. O'Lady" an applies for a job that is open only to elderly female applicants. What Betty doesn't know is that she has been set up as a go-between for her new boss, who happens to be a counterfeiter!

Wilma and Betty use a subliminal "sleep-teaching" method to brainwash their husbands Fred and Barney into doing everything they're told to do. Unaware of what the girls are up to, the boys suddenly find that they are eager and willing to perform mundane household chores and to hand over their weekly paychecks to their spouses. Inevitably, Wilma and Betty feel guilty for manipulating their husbands--but before the situation is played out, both the Flintstones and the Rubbles end up in jail! The final scene, in which an understanding judge imposes a lighthearted punishment on the errant wives, may not play well with contemporary feminists!