When Kate meets Eric at the gym, it's lust at first sight. With Michael working late at the shoe store, Kate spends most of her free time with Eric, who thinks her name Allison. When Michael catches her, she has some explaining to do.

Allison and Kate enter a dance contest at the gym, the finals of which are to be held on television. While attempting to spy on the competition, Kate falls and sprains her ankle leaving Allison to defend the family honor alone.

Kate fails her drivers test, again. She borrows Dad's car and Allison's license to get to The Police concert. When she getting into a fender bender, she, Allison and Michael must hide the damage from Dad.

After going to separate schools, Kate and Allison must attend the same high school when Kate's is turned into a shopping mall. Worried that her sister will not adjust easily, Allison gets Kate a job on the yearbook staff. Kate instantly wins over her new classmates and makes Allison feel like the new girl.

Allison meets a nice college guy who wants to take her to a museum exhibit. Problem is, this means missing her chemistry lab. Kate volunteers to take Allison's place in class so she can go on the date. After Kate and Allison's lab partner, Miles, mess up the assignment, the trio tries to sneak back into the school at night to correct the mistakes.

Tired of living in Kate's shadow and sharing a birthday, Allison decides to move in with Beth.

Allison believes she's found true love with Steven only to find that he is not as devoted to her as he seems.

Kate and Allison try to set Dad up with a friend from Chicago only to find out Dad and Beth are more than just friends.

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