In the series opener, Mike Brady, a widower with three boys, marries Carol Martin, a widow with three girls. Just as the minister says "I do" the boy's dog, Tiger gets loose and chases the girl's cat through the wedding party. Chaos breaks loose which prompts Carol and Mike to yell at their kids to control their pets. Guilt over yelling at their kids comes into play later during Mike and Carol's honeymoon.
An article in an advice column, Dear Libby, draws Marcia's attention. In the article, an anonymous person is in the same situation as Mike and Carol is in and this particular person is unhappy. This leads Marcia to draw the conclusion that Mike or Carol wrote the letter. She later shows the article to the other kids and they devise a plot to keep their newly formed family together.
Cindy has been cast as the fairy princess in the school play. She's excited that her mom and new dad will be able to see her in the production until she learns she can only invite one parent. Torn between who she should choose, Cindy fakes an injury to get out of being in the play.
No longer feeling needed around the Brady household, Alice makes up a story about an ailing aunt in Seattle in order to leave. Later the family finds out the truth and put "Operation Alice" in effect in an attempt to make her stay.
Jan comes down with a mysterious allergy and Carol and Alice try to determine just what is causing it. They deduce that the cause is Tiger, the family dog. Or is it?
With more and more of the girls belongings being moved over from storage, the boys become fed up and take to their 'No Girls Allowed' clubhouse in the backyard which sparks the first of many battles between the sexes. This leads the girls to try to build their own clubhouse.
When Cindy's doll, Kitty Karry-All turns up missing, she accuses Bobby. This leads to a mock trial with Alice as the judge to determine Bobby's guilt or innocence. Then later Bobby's kazoo turns up missing and he blames Cindy.
Mike and Carol prepare for a family camping trip. However, the boys are not thrilled that the girls will be coming along. Meanwhile, the girls aren't exactly thrilled about sleeping in the wilderness. Later on the trip, things go awry when the girls mess up the boys fishing plans and freak out when they hear owl hoots.
With nine people in the house, Mike gets frustrated when he can never get any time on the phone for himself. He decides to install a second phone line, but that only makes the problem worse. Thanks to one of Alice's ideas, Mike decides to install a pay phone in the family room. The plan works ... until Mike needs to use the phone one day to set up an appointment with a hard-to-please, heavily scrutinizing developer ... and when the phone company cuts the call off and Mike doesn't have a dime, the developer isn't too amused at all. But in the end, the pay phone proves its worth, both for Mike's blood pressure and securing a multi-million-dollar contract for Mike's firm.
After watching "Cinderella" on TV, Bobby becomes concerned about stepmothers—especially since Carol asks him to sweep out the fireplace. Soon after, feeling worthless, Bobby decides to run away.
Both Greg and Marcia rush home after school with the news that they're both running for student body president. May the best candidate win, as the boys and girls each take sides and soon each one of them is accusing the other of sabotage. Later, rudeness and apathy abound as each candidate rehearses their campaign speech, leading to a stern lecture from Mike about family unity and how they will be a family far longer than either Greg or Marcia will be class president. It's a speech that Greg take seriously when he fires his campaign manager for recommending that they spread a lie around school that Marcia was seen in the balcony of the local movie theater with an older boy. Marcia (who witnessed the exchange without Greg knowing it) realizes that, while Greg is indeed intensely competitive, he also has integrity and will stick up for his siblings ... and then understands that Greg is the best for the job after all.
Carol is to sing in church on Christmas, but days before the event, she loses her voice. Later at the mall, a hopeful Cindy asks a Santa Claus to bring Carol's voice back by Christmas. Meanwhile, Alice and the kids find it a difficult task hiding Christmas gifts in the house.
Peter comes home from school with the measles, so naturally, Carol calls the doctor, her doctor, who happens to be a woman. Meanwhile, Mike calls his doctor, a man. Soon all the kids come down with the measles and the household is in an uproar in yet another battle of the sexes, as the girls want a female doctor and the boys want a male doctor.
Marcia enters Mike in a "Father of the Year" contest through the newspaper. However, in order to do this she's had to sneak around. When Mike catches her and she's unable to explain, he grounds her from the family ski trip.
The Brady family learns that a trading stamp company is going out of business. A fight breaks out over who should get all of the saved stamps, the boys or the girls. If the girls get them, they'll buy a sewing machine and if the boys get them, they'll buy a rowboat.
The day after Carol reads Mike's horoscope, which states "a strange woman will enter your life tomorrow," Beebe Gallini enters Mike's office and proves to be a most difficult client. Soon, Mike finds himself spending more time at the office than at home with Carol and the kids.
When Greg begins constant daydreaming and his grades start to drop the Brady's quickly think something is wrong. They soon deduce he has puppy love, for a certain girl named Linda. However, they are having an incredibly hard time finding the right Linda but soon the Bradys quickly learn just who this Linda is.
One afternoon, Bobby briefly leaves Tiger unattended and returns to find him missing. Soon a city wide search is on. Meanwhile, a string of burglaries in the neighborhood has Alice paranoid. Could the robbers have lured Tiger away in order to rob the Brady house?
Carol is out of town visiting her sick Aunt Mary and Alice is all prepared to take care of the Brady home. However, she sprains her ankle, after tripping on Chinese checkers, putting Mike and the kids in charge of the household duties. Meanwhile, her boyfriend Sam finds himself in a dilemma over whether or not to take someone else to the upcoming Meatcutters Ball.
Marcia is distraught after getting braces and becomes convinced she's ugly. This compounds when her boyfriend Alan breaks their upcoming date, thinking it's due to her braces. Meanwhile, the Brady kids try their best to make Marcia not feel so self-conscious but with little success.
While shopping at Driscoll's Toy Store, Peter looks up to see a wall about to fall on a little girl. He quickly pushes her out of the way. This leads to immediate media attention and Peter is named a hero. However, Peter lets all the attention go to his head, annoying his friends and his brothers and sisters.
Marcia's sense of security is shattered when Cindy inadvertently gives away her diary to a book collection. Marcia is especially concerned since in it, she confessed a secret desire for Desi Arnaz, Jr.
With constant complaints about the size of the house bombarding Mike and Carol, Mike puts the house up for sale and looks into buying a new one. Immediately after this, the Brady house seems to be haunted.
Mike and Carol switch roles for a day in order to prove a day with the opposite sex involves much less work. Their duties: Carol must help the boys with baseball practice and Mike must help Marcia with a cooking badge.
Jan receives a mysterious locket in the mail with no indication of who sent it. While the Bradys are trying to figure out who sent it, the locket mysteriously vanishes.
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.
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.
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.
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.
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. In the end, Cindy learns there are times when she has to tell what's going on when it's "important" ... such as when Tiger doggie-swipes a claim voucher for a prize Alice won in a jingle-writing contest.
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.
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.
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.
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.
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.
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.
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.
A commercial producer discovers the Brady family while they are grocery shopping and wants them to be in a laundry soap commercial. But the family doesn't use the product, leading to a classic Brady dilemma.
The Bradys set out for a family vacation at the Grand Canyon. But when the family stops in an old ghost town, a paranoid old prospector locks them in a jail cell, believing the Bradys to be after his claim.
The Brady family finally arrives at the Grand Canyon and sets up camp. But the family is thrown into a panic when Bobby and Cindy get lost in the canyon while chasing an Indian boy.
On vacation in the Grand Canyon, Bobby and Cindy become lost and befriend an Indian boy named Jimmy.
Greg buys his first car for $100 from his smooth-talking friend Eddie. Finding that he has been stuck with a lemon, Greg attempts to repeat Eddie's snow job when he tries to resell the car to another sucker.
Greg is furious when he discovers Marcia is dating a rival who had beaten him out of a spot on the basketball team. Seeking revenge, Greg begins seeing the girl who had bested Marcia in cheerleading.
Convinced he doesn't have personality, Peter goes all out to try to get one. After imitating celebrities, Peter tries to be a comedian, but his jokes bomb when he tells them to his party guests. Pork chops...and applesauce!
When Marcia lands the lead role of Juliet in the school play, she lets it go to her head, which leads to her losing the role and having a meltdown when told the bad news.
Peter eavesdrops on his siblings' private conversations with the help of Mike's tape recorder.
Tired of being in Marcia's shadow, Jan is determined to do something that Marcia never did. But Jan becomes more depressed when she fails to make the cheer squad. Then she wins first prize in an essay contest only to discover that her teacher had made a mistake in scoring.
Greg's rib injury keeps him on the football sidelines, but Bobby's new photography hobby leads to a game-deciding discovery.
Marcia makes a promise that she will get Davy Jones to perform at the prom, but finds it almost impossible to reach the former Monkee -- until he surprises her with a visit to the Brady house.
After taking the wrong bike from school and with her grades beginning to slip, Jan is fitted with a pair of glasses. But her unwillingness to wear the glasses leads to the destruction of Mike's anniversary gift to Carol, a portrait of all six children, and the kids must try to reshoot the photo without Mike knowing.
When Bobby and Cindy are not invited to a wedding because they're too young, they set out to do something important: break a teeter-totter record.
Bobby becomes self-conscious about his height and tries different ways to make himself "big." First he tries stretching himself, and then he decides to improve his mind by memorizing a bunch of worthless facts.
Wanting to make a record, Greg books a recording studio and writes a song to perform with his siblings. However, when Peter's voice begins cracking, Greg realizes it's time to change and he's got to rearrange the music.
Jan discovers that Aunt Jenny had closely resembled her in her youth. Jan corresponds with Jenny and receives a photo in return, leading her to worry that she will grow up to look just like her strange-looking aunt. But when Jenny visits, Jan comes to appreciate her unusual lifestyle.
Bobby and Greg make a bet on how many chin-ups each can do. Confident Greg relaxes while Bobby practices, and when the two finally compete, Bobby ends up on top, with Greg doomed to be his servant.
Peter finds popularity after mentioning his classmates in the school newspaper column. But with his schoolwork suffering, he tries the same tactic on his teacher with much different results.
Alice takes a vacation, leaving her duties to her cousin Emma. But the Bradys have trouble adjusting to Emma's militaristic style.
Feeling immature because she is the youngest, Cindy feels that she isn't appreciated until she gets a mysterious letter from a secret admirer.
As a joke, Marcia's plain-looking friend Molly Webber is nominated to be hostess on Banquet Night. Marcia's mission to transform Molly into a knockout succeeds, only to discover that she is running against her friend.
Carol is in a car accident with a man who agrees to pay for his own damages. However, he changes his mind and Carol finds herself summoned to court with Bobby and Cindy testifying against her.
The high school puts on a "Family Frolics" show, with Marcia and Carol performing a routine together while Greg and Mike team up for their own.
Fed up with the number of people in the household, Jan voices her desire to be an only child. The other kids oblige and treat her that way, but Jan changes her tune when she's excluded from the other kids' activities.
In a paper for English class, Greg writes about wanting to follow in his dad's footsteps and become an architect. When Mike reads the paper, he enthusiastically encourages his son, but Greg is uninterested. Meanwhile, Peter and Jan also explore careers.
The kids give Alice the cold shoulder after she reveals that Greg and Peter broke an antique lamp of Carol's. The girls join the bandwagon when Alice innocently tells Carol that Marcia left the stereo on all night. Feeling unwanted and no longer needed, Alice quits.
Greg is crazy for his latest girlfriend, Jennifer, but things get difficult for him when he learns that both Jennifer and Marcia are competing for head cheerleader -- and he just happens to be one of the judges.
Peter is determined to get the part of George Washington in the school play, but the teacher thinks Peter would be better in the role of Benedict Arnold. When his friends start making snide comments about it, Peter decides to get himself kicked out of the play.
When the family dentist, Dr. Vogel, asks Mike if Marcia would be interested in babysitting his kids, Marcia misinterprets the request as a date.
Mike has to check on the construction of a building in Hawaii, so he takes the whole family along. However, ancient Hawaiian superstition begins to plague the family when Bobby discovers a ancient tabu idol that brings bad luck to those who touch it. Part 1 of 3.
During a surfing competition, Greg wears Bobby's tabu idol and wipes out. Soon after, Greg, Peter and Bobby learn of the ancient superstition from a construction worker, Mr. Hanalei. This leads the boys to search for an ancient burial ground in which to return the idol and break the curse. However, they are unaware of a shadowy figure (Vincent Price) trailing them in the cave. Part 2 of 3.
An archeologist (Vincent Price) traps the boys in a cave and takes them hostage, insisting that they tell him where they found the idol. Meanwhile, Jan, Marcia and Cindy debate whether to tell Mike and Carol about the boys' whereabouts when they fail to come back for dinner. Part 3 of 3.
It's the beginning of another school year, and Marcia panics about becoming a freshman, going as far as pretending to be sick. However, after her parents see through Marcia's act, they encourage her to get involved -- but she joins every club available.
Smitten with Jan's friend Kerry, Peter seeks Greg's advice on landing a girl. This leads to Greg playing Cyrano for Peter, but Kerry mistakenly thinks Greg is the one who has feelings for her.
After Jan and Cindy are spooked by a trick ghost rigged by the boys, the girls try to retaliate. But things get out of hand when Alice becomes a victim of their attempts to spook their brothers.
Bobby is crestfallen when he is picked to be safety monitor at school. But with Mike's and Carol's encouragement, Bobby becomes determined to do the job well but goes overboard, becoming the most unwelcome person both at school and at home.
