Season 4

Mike has to check on the construction of a building that his construction firm is building and it so happens the building is in Hawaii, so he takes the whole family along. However, ancient Hawaiian superstition begins to plague the family when Bobby discovers a ancient taboo idol that brings bad luck to those who touch it. Part 1 of three.

During a surfing competition, Greg wears Bobby's taboo 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 to return the idol to break the curse. However, when they arrive at the burial ground, they are unaware of a shadowy figure trailing them.

An archeologist traps the boys in the caves at the burial ground and takes them hostage insisting they tell him where they found the idol. Meanwhile, Jan, Marcia and Cindy debate on whether or not to tell Mike and Carol, the boys whereabouts when they fail to come back for dinner.

It's the beginning of another school year, and Marcia panics about becoming a freshman in school, going as far as pretending to be sick. However, after parents see through her act, they give her some advice, get involved and she does, joining every group or club available.

One afternoon, Jan brings her friend, Kerry home and introduces her to her family. Kerry quickly makes the biggest impression on Peter who wants Greg's advice on landing a girl. This leads to Greg playing Cyrano for Peter, however, Kerry mistakenly thinks Greg is the one who has feelings for her.

One evening, Jan and Cindy claim to have seen a ghost but is revealed to be a trick by Greg, Peter and Bobby. This leads the girls to use the same tactics the boys used to scaring them. However, things get out of hand when Alice becomes the target of the scare tactics.

Marcia and Greg's high school is putting on Family Frolics activity which is a type of variety show with the students and their families providing the entertainment. This leads Marcia to talk Carol into performing a routine with her while Greg and Mike collaborate on their own.

Jan is fed up with the number of people in the household and voices her want to be an only child. So the other kids oblige and give her all the space she wants and she finds that she has more space than she needs or even wants when she begins to 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 is ecstatic and goes all out encouraging him unknown to him Greg just picked whatever career to write the paper. Meanwhile, Peter and Jan also explore careers.

The kids begin to give Alice the cold shoulder treatment 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 he decides to get himself kicked out of the play.

Marcia falls for Dr. Vogel, the family's new dentist. When Dr. Vogel asks Mike if Marcia would be interested in doing some babysitting for his kids, she misinterprets it for him asking her out on a date.

Bobby is crestfallen when he is picked to be safety monitor at school. With Mike and Carol's encouragement, Bobby becomes determined to be the best safety monitor ever but in the process becomes the most unwelcome person at his school, not to mention at home.

Bobby mentions to Mike and Carol that Greg was in a near car accident on the freeway due to the fact that he was reading the cover jacket of a new record. This leads Mike and Carol to suspend Greg's car privileges for a week on the eve of a big date with his girlfriend Rachel.

The Brady kids want to buy a silver platter for Mike and Carol's wedding anniversary but their short on money so they take to means to get enough cash. This leads them to put together an act and appear on a TV amateur contest.

The principal calls home to alert Mike and Carol to the fact that Bobby's playing Jesse James at school. This leads Mike and Carol to learn just how obsessed Bobby about his "idol" and try to dissuade him from worshiping a cold hearted killer.

Marcia has a big problem when she inadvertently makes two dates for the same night. One with Charlie and the other with Doug, the big man on campus. She makes a excuse to Charlie to go out with Doug but quickly learns Doug was only interested in having a pretty girl on his arm after Marcia is hit in the face with a football.

Peter is ecstatic when he gets a job at Martinelli's bike shop. However, his wanting to do a thorough job inhibits his speed and work begins piling up as well as customers begin to customers demand their bikes. This leads Mr. Martinelli to give Peter the axe.

Peter's new detective kit comes in handy when Cindy touches and then looses a pair of antique earrings that Marcia was borrowing from Carol that she warned her not to touch. This leads Peter and Cindy on an all out search for the missing earrings.

Both Robert Reed puts in double duty as Grandpa Brady as does Florence Henderson when she portrays Grandma Hutchins in an episode where the Brady kids play matchmakers and try to get Grandpa Brady and Grandma Hutchins together. However, their efforts may all be for naught when an argument erupts between Grandma and Grandpa during a romantic dinner.

Both Bobby and Cindy have to opportunity to try out to be on a televised children's quiz show if they get a certain score on a written test. However, an overconfident Bobby doesn't study at all and fails while Cindy is chosen and her ego alienates the rest of the Brady kids.

When the family cleans out the attic, both Greg and Marcia realize what a great room it would be and they both begin fighting over who gets it. This leads to yet another battle between the sexes.