In episode one of this two part special, Ant and Dec take on their most personal journey yet, uncovering their family histories using a combination of DNA and genealogy.

Part two of two. Anthony McPartlin and Declan Donnelly embark on a journey to New York to follow the bloodlines of their mothers using DNA analysis and genealogy. There is a surprise for Dec as he finds out he has close family he never knew existed, while Ant's history takes him to the United Nations. After a whirlwind tour of the US, it's back to Ireland to investigate a family secret that Ant's family has been trying to unlock for years.

Freddie Flintoff and Jamie Redknapp face a new kind of challenge - discovering each other's family history using DNA and genealogy.

TV personalities Amanda Holden and Alan Carr embrace their family history on a road trip that covers Cornwall, London, and Erith.

Father and son duo Martin and Roman Kemp take a family road trip of a different kind, one that delves into their family history that spans North London and the North East.