The Bradys and Alice begin their trek to Grand Canyon. But a stop at a ghost town turns out to be a detour, after a demented prospector locks everyone in the jail, thinking they plan to steal his (non-existant) gold claim.
Mike and Peter track down the old prospector, and the Bradys can finally leave the ghost town for the Grand Canyon. However, once they get there, more trouble awaits for Bobby and Cindy.
The Bradys find Bobby and Cindy, who have now befriended a Native American boy who has run away from home to get away from his grandfather who only believes in the old traditional ways.
While the Bradys set up a dunking tank for the school carnival, Greg and Marcia feud when Marcia agrees to go on a date with Greg's biggest nemesis, Warren Mullaney.
Peter is down in the dumps after he is told at a party that he has no personality, so he works on creating a new one for himself. Meanwhile, Bobby and Cindy encourage the family to do safety drills.
Marcia doesn't want to play Juliet in the school play because she lacks confidence and beauty, so the family tries to boost her self-esteem. But soon she lets the praise go to her head and becomes an unbearable diva.
The entire Brady family is chosen to star in a commercial for a "new and improved" laundry soap, but do they have what it takes to make it in show business?
Peter gets in trouble for eavesdropping on his brothers and sisters with a tape recorder and his parents force him to apologize. But Greg and Marcia decide that they are going to go one step further and teach him a lesson themselves.
Jan is tired of being compared to Marcia and constantly being told how great her older sister is, so she tries to do something that Marcia never accomplished--make the pom-pom team.
Greg joins the high school football team and becomes a starter, but Carol doesn't want him to play because he might get injured. Meanwhile, Bobby annoys his family when he becomes a photographer and takes surprise pictures of them.
Marcia says she can get Davy Jones to sing at her school's junior prom because of a letter Jones sent her as president of the local fan club. The problem is that she can't get to him to ask, and the school has already made the announcement.
Jan needs glasses but doesn't want to wear them because of how they make her look--until she has an accident that destroys Mike's surprise anniversary gift to Carol, a framed portrait of the Brady kids.
Greg writes a song for his brothers and sisters and reserves a recording studio for "The Brady Six." However, before they can record, Peter's voice begins to change and starts cracking uncontrollably.
Jan finds an old photo of her Aunt Jenny at her age and discovers that they look exactly alike. But when she discovers what she looks like now, her excitement changes to disappointment--until she pays the family a visit.
Bobby takes advantage of Greg after he wins a bet that Greg can't do twice as many chin-ups as Bobby. Meanwhile, Carol tries to figure out which woman at Mike's high school reunion is his old sweetheart, "Bobo."
Peter "Scoop" Brady gets a job for the school paper, and discovers that writing nice things about classmates has fringe benefits. So when he makes a "D" on his final exam, he tries a snow-job article about his teacher to improve his grade.
Alice's cousin Emma, a former master sergeant, takes Alice's place while she is away, and she subjects the Bradys to a demanding military-like routine that makes them feel like they've been drafted into the Army.
Cindy is jealous of her older sisters and doesn't want to be treated like a kid anymore. Bobby tries to cheer up by pretending to be a "secret admirer." But what will Bobby do when Cindy sets up a date for them to meet?
Marcia's class nominates ugly duckling Molly Webber for Senior Banquet Night host as a joke. Marcia decides to give her a makeover so she can win. But what will Marcia do when she discovers at the last minute that she's Molly's competition?
Carol's minor parking lot accident turns into a nightmare when the other driver claims it was her fault, exaggerates his damages, and then takes her to court.