Who Do You Think You Are?

Actress Cynthia Nixon sets out to discover the roots of her troubled father, who passed away six years ago. Truth becomes stranger than fiction when a mystery of deceit and murder slowly unfolds in relation her three-times great-grandmother.

Actor Jesse Tyler Ferguson thought he came from a "nice, boring family", until he digs into his past. He follows the trail of the adventuresome and troubled life of his great-grandfather and uncovers tales of crime, unknown families and more.

Rachel McAdams and her younger sister, Kayleen, discover an English ancestor that was forced to separate from those he loved. They connect with relatives uprooted by war and uncover the harrowing circumstances behind their Canadian roots.

Valerie Bertinelli goes on the hunt to unlock her family’s mysteries. She tracks down courageous ancestors who suffered through hardship and tragedy, and discovers a royal lineage dating back centuries that she never dreamed possible.

Kelsey Grammer takes a trip into the past to explore his beloved grandmother's family. He uncovers the story of a woman haunted by demons and finds a connection to family who risked everything in one of the greatest migrations in American history.

Julie Chen's maternal grandfather died before she was born, and the only stories she knows are of his playboy ways and rags-to-riches story. She journeys to rural China to learn about his life and uncovers a dramatic tale.

Josh Groban traces his ancestors' roots to Germany and discovers a relative who was not only a deacon, but also a music teacher and well-known astronomer. However, his ancestor's predictions of cataclysmic doom put him in the crosshairs of the church.

Actress Angie Harmon works to discover the roots of her father's vague heritage. She uncovers the dramatic story of her five-times great-grandfather who endured hardship and danger as an immigrant coming to America.

Actor and producer Sean Hayes searches for the cause of his estranged father's troubled past. He follows his ancestral trail to Ireland, where court documents reveal the Hayes' family chaos reaches back generations.

Beyond a family of Hollywood legends, actor and director Tony Goldwyn explores his maternal lineage. He is introduced to a heritage of political activism, including a couple ahead proudly fighting for abolition, women's rights and westward expansion.

America Ferrera searches for a connection to a father she barely knew by exploring his vague roots. She discovers a great-grandfather who led multiple revolts against the government and left an enduring mark on Honduran history.

Actor and director Bill Paxton researches his paternal lineage and uncovers the captivating life of an ancestor who was a war hero in an historic battle. His four-times great-grandfather also shaped politics and society during a turbulent era.

Melissa Etheridge digs into her French roots and finds a family shaken by a scandalous lawsuit, a turbulent relationship entangled with tragedy and an adventuresome ancestor who prospered in colonial America.