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.

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.

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.

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.

Marcia makes a promise that she will get Davy Jones to perform at the prom. A promise she quickly learns is going to be very difficult to keep, since trying to get a hold of him is almost impossible.

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.

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.

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.

Tired of being in Marcia's shadow, Jan is determined to do something that Marcia never did. However, Jan becomes more depressed when she fails to make the pom-pom team and her friend makes the squad. Then she wins first prize in the essay contest and finds out her teacher made a mistake in scoring.

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.

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.

After taking the wrong bike from school and when her grades begin to slip, Jan learns she may need glasses. Meanwhile, Mike's anniversary gift to Carol is a portrait of the six kids. The trick is getting the kids to the photographer without Carol finding out.

Mike has to present some plans for an addition at King's Island, an amusement park in Cincinnati, so he invites the whole family along but when a mix-up occurs Mike is left with a Yogi Bear poster while Jan is left with Mike's plans which she loses on one of the many rides in the park.

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.

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.

For a joke, Molly Webber, a plain Jane, is nominated for hostess on Banquet Night. This practical joke sends Marcia on a mission to transform Molly into a knockout and she succeeds but discovers she may have succeeded to much when she finds herself running against her.

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.

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.

As the Bradys are auditioning for a TV amateur show, a musical agent spies Greg and offers him the chance of becoming a solo star. This begins to worry Mike and Carol who hoped he would go onto college and angers his siblings for deserting them, since they were a group.

Greg has finally landed a date with Sandra but he will only be able to go out with her if he can get a date for her visiting cousin, Linda. He turns to the last resort, he gets Peter to wear a fake mustache and act as if he were an older man.

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.

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

The Bradys set out for a family vacation to the Grand Canyon. However, en route, the family stops in an old ghost town where an old prospector locks them in a jail cell.