Ben Cooper and his family are struggling to get a grip on household chores, school and work. So when Ben sees that a Smart House is being given away, he enters the competition as often as he can, until they eventually win the house (named Pat). After moving in, Pat's personality radically begins to change, turning the Coopers against her.

You're Invited to Mary-Kate and Ashley's Costume Party encompasses several American cultural eras from poodle skirts to disco fever, and learning about these eras provokes the twins to throw a party in their basement.