 Carol s 8-year-old nephew, Oliver Martin, comes to live with the Bradys for awhile (since his family was going on an African archaeological dig and couldn t come along). Oliver wants to help out and be friends with his new family, but in trying too hard, he winds up causing a whole lot of accidents around the house. This leads the younger siblings to become convinced that Oliver is a jinx. A visit to a movie studio - where, because Oliver is the 1 millionth paying customer, they get to appear in a 1920s-style comedy movie as extras - helps him see otherwise.