Merle suffers a career-ending shoulder injury and doesn't know what to do if he can't play baseball. Merle comes upon Nicholas and his friends playing ball. He is offered a job of assistant coach of the High School team. One of Mary's patients falls in love with her and won't leave her alone. Eager to earn more money, Jeremy gets a job convincing people to try experimental products.
Ellen tells Tommy that she doesn't want to marry him and Tommy isn't sure what he wants to do. At the last minute, they both realize it is not the right thing to do. Joannie is jealous when the station hires a female anchor. Jeremy drops hints about his upcoming birthday. Nicholas plans a surprise birthday for Jeremy.
Just as Tommy's career is about to take off, his old girlfriend returns to tell Tommy she is pregnant after it is announced that his band has been booked for a national tour. Nicholas wins a girl's heart by standing up to a bully. Mary, Nancy, Elizabeth, and Joannie adopt a bum named Max, and bring him home for dinner.
Jeremy wants to manage Tommy's band and tries to get him a gig. Joannie is chosen to organize a charity telethon and tries to get celebrities to appear on the show. She recruits the family to perform and Nicholas saves the day with his on-the-air speech and performance. David gets a new roommate to save money on the rent.
Tommy and Ernie, back from college with a ""preppy"" look, run into Jill, Tommy's old girlfriend. When Jill picks Ernie over Tommy, David helps him realize that reliving the past is not the real world. David moves into a singles-only apartment building. Upset by Tom's refusal to give him money, Nicholas gets a job delivering a rival newspaper
Joannie involves David in the renovation of an old opera house. However, Janet is the legal counsel for the developer who wants to build low-income housing on the site. Nicholas gets a horse from Joe Simons and Abby help him find a way to keep it. Merle returns home from the New York Mets, but Susan is too tired from taking care of Sandra Sue to enjoy his visit.
Joannie is tired of not getting any serious assignments at work and Abby encourages her to take a leave of absence to evaluate her career, and falls for a co-worker. Nancy finds out fame has a price when she becomes the ""Sunshine Soda Girl."" Tommy needs a ticket to a rock concert and Nicholas has one to sell.
Abby is proud of the progress one of her students has made and invites her to the house for dinner. Jeremy falls for 16-year-old Darlene, who likes to flirt and cause trouble (shades of Melrose Place), and he refuses to listen to Abby's advice about her. Nancy gets a modeling job as the spokesperson for a shady heating and cooling company. Nicholas tries to impress a 12-year-old girl with his cooking ability.
Nicholas and his friend, Melvin, start a messenger service to earn money and get more than they bargained for. One of their first deliveries turns out to be an airline bag full of money to be used for political bribes. David is frustrated when another construction company keeps underbidding him. Abby and Donna plan a surprise party for Tom.
Ernie introduces Tommy to a slightly older songwriting woman who has a 4-year old son. When he falls for her, she has second thoughts. The Bradford's convert the garage into an apartment for Susan and Merle. Nicholas supervises the conversion job. Jeremy begins to feel like part of the family when Abby enrolls him in school and Tom makes him follow the household rules.
Susan brings the baby, Sandra Sue, home from the hospital. When Joan's parents visit the Bradford household to see the family and their great-grandchild, a conflict with Abby occurs as Joan's parents disapprove of the way Abby is raising Nicholas. Grandpa and Abby make up and finally accept Joan's death in a touching story. Tommy gets a job playing the guitar at a male strip joint
Abby goes to a funeral in San Francisco and returns with her nephew, Jeremy, who has nowhere else to go. His behavior upsets the family, referring the Bradfords as that other family (The Brady Bunch), but all ends well as he becomes the newest member of the Bradfords. Joannie is promoted to sports anchor. Nicholas gets into trouble for selling peeks at Mary's medical books.