Louis Theroux continues his exploration of the fringes of American society. He visits Southern California, home to a group of people known as swingers. There he meets Gary and Margaret Lee who host parties at their home but only for swinger couples, so Louis goes searching for a date.

This week, Louis Theroux tries to infiltrate Michigan's demolition derby industry and drive in a race himself. He seeks advice from drivers Jon Lipka and Rick Arnold and cousins Kevin and Steve Hanna, who find him a car and get him ready for his first competition. But after seeing them in action, Theroux begins to wonder if he is up to the challenge.