Season 4

Featuring singers Kelly Clarkson and Trisha Yearwood, supermodel Cindy Crawford, actors Chris O'Donnell and Jim Parsons as well as actresses Zooey Deschanel and Christine Applegate.

Season 4

Episode 1 - Kelly Clarkson: The singer discovers a brave ancestor with deep roots in America history and combat.

Episode 2 - Christina Applegate: The actress sets out to uncover what happened to the beloved paternal grandmother she, nor her family, never knew.

Episode 3 - Chelsea Handler: The comedian and television host investigates her grandfather's role in the Second World War.

Episode 4 - Zooey Deschanel The New Girl star investigates her ancestors' involvement in the anti-slavery movement and her father's Quaker family background in Pennsylvania.

Episode 5 - Chris O'Donnell: The NCIS star explores his father's side of the family discovers a legacy of courage.

Episode 6 - Cindy Crawford: The former supermodel explores the mystery behind her Midwestern family's origins and travels to the UK to investigate her family's origins and possible links to royalty.

Episode 7 - Trisha Yearwood: The country music singer looks into the paternal side of the family and uncovers an English ancestor's history of crime, loss and perseverance.

Episode 8 - Jim Parsons: The star of The Big Bang Theory honours his father's memory and goes on a journey that includes stops in Louisiana and France.