The misadventures of a large family formed by the marriage of a woman with 3 daughters and a man with 3 sons.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.