Adrian Dunbar and Neil Morrissey team up in Tuesday night's episode of DNA journey as they travel to Ireland to learn about their family histories.
The duo, who have been friends for 42 years since they met in drama school, started alongside each other in the popular crime drama Line of Duty which was filmed in Northern Ireland.
In the episode using DNA and genealogy, they are on a journey that will take them across the UK and Ireland, reconnecting with lost cousins and unearthing long-held family secrets.
