Research into the ancestry of singer Lea Salonga and actress Amanda Seyfried reveals relatives who survived heart-wrenching ordeals.

Exploring the Italian roots of television host Joy Behar and actor Michael Imperioli.

Traveling across China and the American South to reveal the ancestry of novelist Amy Tan and poet Rita Dove.

Exploring the ancestry of actress Sharon Stone and model Chrissy Teigen includes travelling across Europe and Thailand.

Exploring the ancestry of chefs José Andrés and Sean Sherman.

Tracing the family trees of musician Rubén Blades and journalist Natalie Morales.

Actors Kristen Bell and Dax Shepard learn about their family histories, which includes stories of soldiers, settlers and criminals.

Actresses Debra Messing and Melanie Lynskey explore the stories of their ancestors whose bold decisions reshaped their families.

Henry Louis Gates, Jr. meets Sheryl Lee Ralph and Lonnie Bunch - two African Americans trace their ancestors, who overcame slavery and traveled from southern plantations to northern cities, forging prosperous families despite adversity.

Family mysteries: actor Laurence Fishburne and scholar Henry Lewis Gates, Jr. peer into their mysterious family roots using DNA evidence to track down lost family members and their histories.