Today's most-beloved and iconic celebrities, including Matthew Broderick, Lisa Kudrow, Spike Lee, Sarah Jessica Parker, Susan Sarandon, Brooke Shields and Emmitt Smith, star in "Who Do You Think You Are?" allowing television viewers an intimate look as they embark on a journey of self-discovery to trace their family trees. Each episode will reveal surprising, inspiring and sometimes tragic stories that are often linked to events in American and international history. Each week, a different celebrity is taken on a journey into his or her family history. The journey is one of surprising and deeply emotional encounters with the result being one of the most compelling reality formats of recent years. Viewers will be taken on an emotional, personal and often mysterious quest following America's best-known celebrities into their past, sharing their surprise as they uncover stories of heroism and tragedy, love and betrayal, secrets and intrigue that lie at the heart of their family histories.