In Holland and Germany, Rory Bremner delves into the wartime experiences of the father he didn't know very well.

Fiona Bruce discovers the sad truth behind her great-grandfather's mysterious death, and returns to her family's ancestral home.

Wildlife presenter Liz Bonnin describes herself as 'a mongrel' - the result of her parents' lineages on the Caribbean islands of Trinidad and Martinique. In Trinidad, she goes in search of the first of her maternal ancestors to arrive on the island from India. Liz then heads to Martinique where her paternal ancestors are said to have owned plantation - and slaves. What she discovers is more complicated than she could have ever imagined.

Moira Stuart's family tree exploration takes from the Highlands of Scotland to the West Indies.

Ian finds out more about the part his grandfathers played in the wars of the 20th Century.

Actor Kevin Whately discovers that his ancestors were amongst the richest and most powerful men of the 17th century.

TV presenter Kate Humble knows little about her family history. What she does know is that her paternal grandfather was a test pilot, and she believes her maternal grandfather ended up in Colditz. On the trail of her grandfather Bill Humble, who was a test pilot during the Second World War, Kate visits the RAF Museum. She is astonished to discover what a legend Bill was in flying circles, and is amazed to see his daredevil flying for herself in archive film held there.

The stern host of BBC2's Newsnight searches for his roots.

Lesley explores her family tree in Yorkshire.

David's quest to discover his family take him to the Isle of Mull, and then on to Londonderry, to confront an unexpected side to his ancestors.

Actress Zoe Wanamaker traces the roots of her family back to the Ukraine via America and the anti-communist witch-hunt that caused her father Sam to flee to the UK.

Bill Oddie is the first celebrity to undergo the family tree search, as he endeavours to find out more about his mother, who was institutionalised when he was a child.

As the 'last of the McKellens', Sir Ian admits to a degree of melancholy as he delves into his family history. But the results pay off richly for one of Britain's greatest actors and civil rights champions. Ian's journey uncovers a theatrical ancestor, a Victorian political activist and a link to an ancient Druidical landmark in the Lake District.

BBC News presenter Sophie Raworth investigates her father's side of the family, and discovers a tragic but inspiring tale of ancestors who risked everything to move to America in search of religious freedom. Closer to home, she explores a family rumour that her great grandfather worked at Kew Gardens, and is astonished to uncover a horticultural heritage stretching back to the 1700s and pineapples.

Liverpool-born Kim Cattrall sets out to solve a family mystery that has endured for more than seventy years, the disappearance of her grandfather.

Robert's roots take him back to Derbyshire.

Davina McCall makes some intriguing and shocking discoveries as she delves into her family's past, hoping to learn more about her maternal French heritage.

Kevin Clifton investigates the rumour of an ancestor from Canada’s First Nations, taking him on an extraordinary journey to the country’s remote 18th-century trading posts.

Actress Amanda Redman explores her roots.

David explores his Jewish roots and discovers some Orthodox Jewish relatives in London.

Actor Warwick Davis owes his big break aged 11 to his paternal grandmother Edith, who heard a radio ad 'looking for short people to appear in Return of the Jedi'. Warwick takes a non-judgemental approach as he researches the family line stretching back from Edith, finding humanity and humour in some uncomfortable stories. On his maternal side, Warwick is equally open-minded when he finds out about his three-times-great-grandfather - a postman who lived a double life.

Sheila Hancock chases after a mysterious woman in a photograph in the search for her roots.

With his dad having died when he was 10 and his parents having divorced some years before, Martin Freeman tries to find out the paternal side of his family history.

Amanda Holden has always heard stories about a rumoured French ancestry on her mum's side, and her investigation uncovers an extraordinary Napoleonic-era cross-channel romance. On her dad's side, Amanda's grandfather's suicide has always loomed large. But when his story takes Amanda to France once again, she is moved to discover how he helped others through a harrowing tragedy.

Actress Sue Johnston explores her roots.