Mike and Carol agree to allow Marcia to have a slumber party and the boys are thrilled because then they'll be able to play tricks on everyone. Then when Marcia gets into trouble at school, the slumber party is canceled.

A bully named Buddy Hinton has been making fun of Cindy's lisp. So in order to defend her, Peter tries to learn how to defend himself.

Clark Tyson, a boy that Jan has a crush on, likes older girls, especially Marcia. This leads Jan to make up an imaginary boyfriend, George Glass.

Peter breaks Carol's favorite vase on the eve of a camping trip that he's looking forward to. So in order for him to go on the trip, the other Brady siblings unknowingly each confess.

Tired of being the middle blond girl of the family, Jan tries to alter her appearance by buying a black wig, which she intends to wear to a friend's upcoming birthday party.

Greg, tired of the antics of his younger siblings, thinks he should have his own room. Mike allows Greg to turn his den into his own room. This also leads to Greg dressing a whole new way and talking a whole new way, including calling his parents by their first names.

A reporter interviews Marcia and asks her about her views on Women's Lib. This leads to her joining Greg's Frontier Scouts to try to prove a woman can do anything a man can do.

Don Drysdale's tips for Greg on his baseball playing go to his head. Which leads to Greg deciding to not go to college and he even starts to think about dropping out of high school.

Mike and Carol decide to allow Greg and Marcia babysit for the younger Bradys one evening when they go out for the evening and Alice is out with Sam.

Greg's history project is a home movie about the pilgrims with the rest of the Bradys clan as the cast. However, soon the other Bradys take over and pretty soon Greg loses control of his project.

Marcia has a crush on a boy who doesn't even know she's alive, at least not until she studies up on his favorite hobby, insect collecting.

Greg gets his first job as an office boy at Mike's architectural firm. However, he places his job in jeopardy when he carelessly loses some important designs.

While playing football in a vacant lot with Greg and Peter, Bobby discovers a wallet containing $1,100. When the girls learn about the boys' coup, they decide they want a cut of the money; this leads to yet another fight in the Brady household.

Cindy has become somewhat of a tattletale leading Alice to get in a fight with Sam and the other siblings leaving her out of their activities.

When Bobby falls from a tree and sprains his ankle, he devolops a fear of heights. This prompts the Brady family to try to cure his fear.

Jan's practical joking puts Greg's science project, a mouse named Myron, in mortal danger when he gets loose allowing Alice to catch a glimpse of him which leads to her calling the exterminator.

Jan and Cindy catch Greg smoking with some friends. This leads to them telling Marcia who in turn tells Mike and Carol.

When Bobby gets a set of drums he drives the family up the wall. Meanwhile, Peter is made fun of for being in the glee club by his football teammates.

Mike's boss, Mr. Phillips, invites him and his family on a fishing trip on his boat. However when Cindy comes down with tonsillitis, the trip is postponed. Tonsillitis quickly claims another, when Carol also must have her tonsils taken out.

After witnessing a magician performing a disappearing act, Cindy refuses to sleep with the lights off. Meanwhile, Peter begins to develop a magic act and a reluctant Cindy agrees to be his assistant.

After discovering he is the only Brady without a trophy, Bobby enters numerous contests in order to win one. Including, selling magazines and a televised ice cream eating contest.

The Brady family goes all out to try to save a neighborhood park from being built on. This puts Mike's job in jeopardy since his company is the firm in charge of the construction.

An old boyfriend of Alice's, Mark Millard, comes to town and begins to wine and dine her, unknown to her he has other intentions in mind.

Carol is secretly writing an article about life with the Brady Bunch for Tomorrow's Woman Magazine. But soon after sending the article in, she gets a rejection letter.