When she has trouble making (and keeping) friends, Al decides to start hanging out with a group of bad girls. When Dana alerts Frank about Al's new friends, he prohibits her from seeing them again, leading to a huge argument. Eventually, Al realizes her friends are no good when they let her take the fall for stealing Cody's electric guitar.
Carol begins to feel insecure about her appearance and aging beauty as her 40th birthday approaches, so she orders some diet pills that make matters even worse. Meanwhile, Cody consults with a psychic to meet Abraham Lincoln (the topic of Al's term paper). Al decides to do the research herself as the unorthodox Cody claims he is having a normal(?) conversation with the 16th president.
Cody is looking forward to his father, who is Frank's brother, coming for a visit for his birthday. As a gift, he offers to make Cody the senior vice president of his real estate company. However, Cody doesn't quite fit the corporate image. Carol sets up Dana and Karen with a potential dates from hell, and they get back at her. But Carol manages to have the last laugh.
On prom night, JT is set up with a 13-year-old girl (as a joke). Meanwhile, Dana's date doesn't go much better when her boyfriend decided to get back with his ex-girlfriend. The two are left to comfort each other and wind up sharing a few dances, as well as gaining a new grudging respect for each other.
Mark feels that he is not getting enough respect so he takes up karate. After the teacher kicks Mark out of the class, he turns to Cody for help. Cody, who has a black belt, helps train Mark for the big tournament. On the day of the tournament, Mark faces the best person. He falls behind in the beginning, but Cody sees his weaknesses and Mark comes back and ties the match at 2-2. Although Mark ends up losing the match, he gains everyone's respect, except the teacher that kicked him out of the class. He challenges Cody and is beaten badly. In the Lambert house, there ...
JT is sent his first credit card. Frank doesn't think he can handle the responsibility and a spending spree soon shows that JT can't. Dana is not happy about going to a local public college and her first English essay is a disaster.
Cody gets amnesia when he is struck by lightning as he is putting up an antenna on his van. Karen wants to be the homecoming queen but, with the voting even, she has to go out on a date with a nerd to get his vote.
It's Halloween at the Lambert's and Cody grows a gigantic pumpkin for the occasion. Mark is interested in a girl at school and asks her to the party. She turns out to be a bit more of a handful than he expected.
Carol thinks she is pregnant, which leaves both Frank and Carol shocked. Al has her first real date and asks her siblings for help. Dana and her study group get a C for a philosophy test that Cody manages to get an A for.
Al has a new boyfriend, Zack, who has just moved into the area. His anti-establishment views on life upset Frank and he stops her from going on a date with him. Suddenly, Dana finds out that she is allergic to Cody.
Frank and Carol go away for a romantic weekend. Frank is worried that Carol is going overboard about the baby. Mark has a computer date. The girls have a bonding session, answering quizzes and talking about their fantasy man.
It's Christmas time and JT feels that he can going skiing with his mates now that he is 18. However, the trip doesn't quite go as expected. Bad-tempered Aunt Edna comes for a visit, much to Frank and the children's displeasure.