Larry Dittmeyer, an unscrupulous real estate developer, explains to his supervisor that almost all the families in his neighborhood — except for the Brady family — have agreed to sell their property as part of a plan to turn the area into a shopping mall.
One evening, a man claiming to be Carol's long-lost first husband, Roy Martin, shows up at the suburban Brady residence. The Bradys believe his story about suffering from amnesia and having plastic surgery after being injured. Mike has been planning a second wedding/renewal of vows for himself and Carol, for an anniversary present without her knowing, although Roy's arrival throws a monkey wrench into things. Throughout Roy's stay, he is openly hostile to them, his sarcasm and insults completely going over their heads. Peter, who is trying to decide what career path to choose, starts idolizing and emulating Roy, which frequently gets him in trouble at the architect firm where Mike works.