Actor Toby Jones uncovers the remarkable World War II stories of his maternal grandparents, Reggie and Dorki, whose love endured despite the trauma and hardships they faced. He learns about his grandmother’s dramatic escape from the Nazis in Northern France, and solves the family mystery of how his grandfather was shot while fighting the Japanese.

Actress Keira Knightley ("Pride and Prejudice," "Atonement") has starred in several films set during World War II, yet admits she never knew much about her grandparents’ actual wartime experiences. Now, through conversations with family members and historians, she learns of the triumphs and tragedies her grandparents faced during some of the biggest conflicts of the century.

Actor Kit Harington, who has played soldiers, spies, and – in "Game of Thrones" – warriors, discovers that his grandparents played comparable roles in their real lives during WWII. Speaking with family members and historians, he gains a new appreciation of the courage and sacrifice all four grandparents shared as they fought for their country and for a cause.

Follow actress Carey Mulligan as she travels to Japan to learn about her grandfather’s experience as a British naval officer during World War II, including the kamikaze aircraft attack he survived, and the extent of the devastation he witnessed.

Follow actress Kristin Scott Thomas as she pieces together a lost chapter of her family history, learning how her grandfather, a Royal Navy officer, saved thousands at Dunkirk and survived some of World War II’s most devastating battles.

In this episode of My Grandparents' War follow actor Mark Rylance as he explores the extraordinary story of his grandfather, who spent nearly four years as a Japanese prisoner of war during World War II, and examines his own beliefs about war and peace in the process.

My Grandparents' War is a four-part series that follows Hollywood actors as they retrace the footsteps of their grandparents and learn how World War II changed the lives of their families and the world.