Air date: 1/1/71

A practical-joking Jan sets loose Greg's science project mouse, Myron, after he and his brothers decide to take Myron's cage up into their room at night out of fear of the neighbors' cat, Gwenevere, trying to eat Myron. Jan decides to hide Myron in the girls' clothing hamper, but Myron chews his way out and runs about the house.

Where There's Smoke

Air date: 1/8/71

While hanging out with his friends from high school, Greg experiments with smoking just as both Cindy and Jan watch him in the act. While at home, Cindy and Jan tell Marcia about Greg smoking the cigarette and about his coughing as well. Marcia then tells both Carol and Mike about Greg smoking the cigarette and that she did the right thing about telling. Greg confesses when Carol and Mike find out about it from Marcia and that he only gets a firm warning and not a punishment about the dangers of cigarettes. Greg states that he didn't like smoking the cigarette in the first place and that he promises to both Carol and Mike that he never will smoke again. Meanwhile, just as Greg and his friends Johnny, Phil, and Tommy are in a rock band The Banana Convention, Carol is now serving on the high school's anti-smoking committee with Tommy's mother Mrs. Johnson. The two subplots come into play when Greg comes home, and with Carol reminding him to once again hang up his coat, a pack of cigarettes falls out from one of the coat pockets and onto the floor: Just as Greg adamantly states the cigarettes aren't his, Mrs. Johnson promptly removes Carol from the high school's anti-smoking committee. Just after Carol is removed from the high school's anti-smoking committee, Greg still adamantly states that he is sticking to his promise never to smoke again, and that he can neither explain nor figure out in any way as to how the cigarettes ever ended up among his personal possessions in the first place. Finally, after a couple of days of trying to figure out how the cigarettes ended up among Greg's personal possessions, Alice discovers that he brought home someone else's coat by mistake, which is how Greg mistakenly got possession of the cigarettes in the first place. According to Alice, Greg's coat, identical in appearance to the other person's coat, had its inside lining ripped on some handle bars from just the month before, which Alice mended back together again, and that the other person's coat never in any way was damaged, which means the cigarettes must belong to the owner of that other coat. Tommy, realizing he has Greg's coat by mistake as he found a test paper of Greg's in one of its pockets, stops by the Brady home to switch back the coats. When Tommy asks for his coat back, Greg wants him to explain everything to both Carol and Mike about who really owns the cigarettes. As Tommy confesses that the cigarettes are his and not Greg's, Mrs. Johnson walks in, wanting to know what was keeping her son Tommy. When Mrs. Johnson hears the real truth about Tommy's smoking habits, she not only apologizes to Greg, she welcomes Carol back on the high school's anti-smoking committee after all.

Will the Real Jan Brady Please Stand Up?

Air date: 1/15/71

Jan, believing that brunettes have more fun than blonds, invests in a wig to stand out at a party. The whole thing turns out to be a fiasco as the partygoers ridicule her new look, sending her home from the party crying. In the end, the partygoers show up at the Brady doorstep after a change of heart.

The Drummer Boy

Air date: 1/22/71

Bobby is depressed after being rejected from joining the Glee Club, so Mike suggests a musical instrument. He chooses the drums, but his talentless efforts drive the family and the neighbors crazy. In the secondary plot, Peter is relentlessly teased because he plays football and sings for the Glee Club. Just as he is about to quit the Glee Club, he and the other football players learn a lesson from Los Angeles Rams football team lineback Deacon Jones.

Coming-Out Party

Air date: 1/29/71

Just as Mike's boss Mr. Ed Phillips invites the Brady family for an outing on his boat, Cindy comes down with tonsillitis. Dr. Howard thinks that it is alright for Cindy's tonsils to be removed after the trip, but then discovers that Carol also has tonsillitis. Mike decides to postpone the boat trip, but the trip gets cancelled when Carol accidentally insults Mr. Ed Phillips. In the end, all the confusion is resolved, and the Bradys get to go on the trip after all.

Our Son, the Man

Air date: 2/5/71

Greg tries too hard to act like an older teenager: He wants his own room and, in trying to pick up an older girl, he tries acting too mature for his age at school. He gets Mike's den as a room since the attic is too small. Greg refuses to participate in family activities such as planning the annual family camping trip. Greg soon realizes that has a lot of growing up to do.