Join Larry David and Bernie Sanders, who learn they have more in common than they thought.

Guests: Carly Simon, Christopher Walken, and more. In this episode, three guests each learn about a grandparent whose real identity and background had been a mystery to them. Along the way, two of them also discover that their close relatives were on the wrong side of history.

Guests: Ted Danson, Mary Steenburgen and William H. Macy. Three mainstays of modern-day Hollywood discover family legacies that predate the United States itself.

Guests: Ta-Nehisi Coates, Ava DuVernay and Janet Mock. Three guests who have helped to redefine Black America in the last decade find their identities challenged as they learn about their family origins.

Guests: Scarlett Johansson, Paul Rudd and John Turturro. In this episode, three guests explore the tremendous challenges faced by their immigrant forebears.

Guests: Bryant Gumbel, Tonya Lewis-Lee and Suzanne Malveaux. Three African-American guests delve deep into their family trees, discovering unexpected stories that challenge our assumptions about black history.

Guests: Lupita Nyong’o, Carmelo Anthony and Ana Navarro. Three guests explore how their family trees were shaped by political turmoil and violence, discovering sometimes unexpected ancestry along the way.

Guests: Gaby Hoffmann and Téa Leoni. Two guests whose lives have been shaped by family mysteries are introduced to biological ancestors they never knew they had thanks to genetic detective work.

Guests: Questlove, Dr. Phil and Charlayne Hunter-Gault. Three guests of disparate backgrounds dig into their Southern roots, where slavery and its aftermath shaped families both black and white.

Guests: Amy Schumer and more. Guests who have found fame mining their family stories for comedy learn about ancestors who overcame immense suffering.

Pastor Rick Warren, Rabbi Angela Buchdahl and Sheik Yasir Qadhi are of three different faiths, all with complex family histories that profoundly shaped their religious beliefs. Our research of their roots unearthed a story about the spiritual foundations of this country, an unrelenting struggle to achieve our ideal of religious freedom and tolerance, but also the difficulties sometimes of holding onto one's faith and still feeling like an "authentic" American.

Questlove, S. Epatha Merkerson and Ava DuVernay explore the unexpected places where their ancestors were scattered by slavery.

Laurence Fishburne and Sheryl Lee Ralph learn about their family histories.

Actor Ben Affleck discovers his mother's past as a Freedom Rider in 1964, NAACP President Ben Jealous learns how far his great-grandfather would go to keep his family whole, and actress Khandi Alexander learns about her grandfather's death. This episode is not available from pbs because actor Ben Affleck had persuaded Gates to omit information about his slave-owning ancestors. In the investigation, PBS said that producers violated network standards by letting Mr. Affleck have “improper influence” and “by failing to inform PBS or WNET of Mr. Affleck’s efforts to affect program content.”

Exploring the ancestry of chefs José Andrés and Sean Sherman.

Henry Louis Gates, Jr. explores the diverse family histories of politicians Paul Ryan, Tulsi Gabbard and Marco Rubio. They each see a shared vision of the great American melting pot reflected in their ancestors’ stories.

Henry Louis Gates, Jr. journeys with Erin Burnett, Amy Carlson and André Leon Talley, three guests from diverse backgrounds, as they meet the ancestors who laid the groundwork for their success.

Guests: Lewis Black and Roy Wood, Jr. Henry Louis Gates, Jr. provides comedians Lewis Black and Roy Wood, Jr. with accounts of hardship in their family trees which may have led them to each find humor in adversity.

Henry Louis Gates, Jr. retraces the ancestral journeys of David Chang and Raúl Esparza, whose families fled their homelands, leading them to find lost parts of themselves along the way.

Billie Jean King, Derek Jeter and Rebecca Lobo learn about their family histories. King discovers that her grandmother was an orphan; Derek Jeter investigates his ancestors' lives as slaves; and Lobo finds out that an ancestor was forced to flee Spain because of his democratic ideals.

Ken Burns learns that his Southern ancestors include Confederate soldiers and a slave owner; Anderson Cooper learns that an ancestor on his father's side was killed by one of his slaves; and Anna Deavere Smith learns about her great-grandfather, who was a free black man and former conductor on the Underground Railroad.

Explore the shared Irish ancestry of three powerful social commentators of our times, Bill Maher, Soledad O'Brien, and Bill O'Reilly.

Henry Louis Gates, Jr. guides Regina King and Damon Lindelof, the creative forces behind a visionary television series, as they discover that they have more in common than meets the eye.

Henry Louis Gates, Jr. explores the extraordinarily diverse roots of journalist Sunny Hostin and actor Jesse Williams—telling long-lost stories of African and European ancestry that compel his guests to rethink their own identities.

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