Actor Matthew Broderick looks into his family history and inadvertently helps historians solve a 150-year-old mystery.

Actress Alfre Woodard researches her grandfather's roots. She discovers a relative who endured a horrifying period in American history but managed to accomplish an extraordinary feat.

Bryan Cranston explores his paternal roots, seeking answers to why his father abandoned the family when Bryan was just 11 and uncovering a troubling pattern of desertion.

Courteney Cox traces her maternal line back to ambitious and ruthless relatives who plotted and murdered their way to power in medieval times, and she's shocked to discover that her ancestor is one of Europe's most famous characters.

Jennifer Grey discovers more about her grandfather as she uncovers how he survived adversity to become a beacon of his community, and discovers a great-grandmother whose devastating tragedy stopped her from making it to America.