Steven's father arrives for a visit, causing the two to clash as always. When his father reveals an important piece of news, Steven begins to question their whole relationship.
Mallory is scared and confused when "Uncle Arthur", a close friend of the family and her father's co-worker at the television station, makes a pass at her. Meanwhile, Steven prepares a farewell tribute to Arthur to air during the station's telethon.
It's Thanksgiving at the Keatons but the turkey dinner might have to wait when Steven and Elyse head to an anti-nuclear weapons rally and get arrested.
Alex buys and sells stock on paper for a school project. He does so well, he decides to buy and sell for real, using his parent's stock account. Things go well, until they don't.
Elyse tries to help her friend Suzanne through a rough patch by hiring her on as her assistant but comes to regret it when Suzanne forgets her place and takes over Elyse's business.
With their parents out for the night, Alex and Mallory argue over who has to stay to watch Jennifer, leading Alex to take her to a poker game with his friends.