Season 4

Natasha travels to Cape Town in search of information about her father's involvement with the anti-apartheid movement during the 1960s. Later, after researching a possible connection with King George the Third, she travels with her Australian cousin Benni to Belarus where some disturbing discoveries are made about the persecution of her Jewish ancestors.

Although John Hurt was born in England, he is proud of his Irish heritage and hopes he will be able to discover the truth about an illegitimate daughter in his family tree.

Griff Rhys Jones looks at both sides of his family's history, learning about the early British railway workers and trying to work out whether relatives really died in a train crash or there might be darker family secrets.

Although there comes a point in her investigations when Carol Vorderman's eyes fill with tears she manages for the most part to keep a lid on things in tonight's edition of the reality/ genealogy series. Initially, that's because her mother's side of the family seem a jolly lot with a great-grandfather who was an astute businessman and owned the first butcher's shop in Prestatyn. It's not until Vorderman starts poking around in her Dutch father's family that things get a bit more emotional. Tony Vorderman and his wife split up three weeks after her birth and Carol didn't see him for more than 40 years. All she has to go on is a family rumour that her great-grandfather was robbed of the Nobel Prize for science, and that her father worked for the Dutch Resistance during the war, with the fishy nickname "Snoek".

Alistair McGowan explores his heritage from his father's side, investigating what 'Anglo-Indian' means by a journey to India.

As a Protestant growing up in Catholic Ireland, Graham Norton sometimes felt that he and his family were made to feel like foreigners in their own country.

Olympic rowing champion Matthew Pinsent knows that his parents' families were greatly affected by WWI; two of his grandfather's brothers were killed, as well as his grandmother's only brother.