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.
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.
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.
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.
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 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?