David Tennant - Best known for his role as Doctor Who, David Tennant abandons the Tardis to investigate his own history. All he knows of his background is that his family hails from Glasgow, and that there's some Irish blood in his veins. He learns that his maternal grandparents had a 'Posh & Becks' type romance when his grandfather was hero of the local football team in Londonberry. And on his father's side, he must look into the MacDonald family history - his real surname. (From the UK) (Documentary Series) (Rpt) PG CC