Kirsty Young's castaway is the actor David Tennant.
He has been voted the best Dr Who ever and has redefined the Time Lord for a generation of parents and children.
As a child he was a huge fan of the programme; he reckons he only ever missed one episode, wore a long stripy scarf and queued up to meet Tom Baker and get his autograph. As a role, he says, it appealed not just to his adult self but to the eight-year-old boy who was just below the surface
[Taken from the original programme material for this archive edition of Desert Island Discs].