Star Iain I'm just Jack on the box.
The Edinburgh-born actor will be back on our screens this week playing a boozy private eye in Jack Taylor.
Glen, 51, is a familiar face on the small screen in hits Ripper Street, Game of Thrones and Downton Abbey.
But he says he jumped at the chance to appear in the private eye drama, which is set in Ireland.
He revealed: "I've always fancied playing a private eye, ever since I saw Jack Nicholson as Jake Gittes in Chinatown."
Jack Taylor is based on the best-selling books by Irish author Ken Bruen.
The gritty story is about an alcoholic who becomes a private detective after he's kicked out of the police.
Glen said: "Ken Bruen offers you fantastic dialogue.
"It's kind of Philip Marlowe with American, quick, dry one-liners all the way. It's lovely to play."
BOOZE WHO Glen