Glasgow-born actor and Oscar-winner Peter Capaldi has been named as the 12th incarnation of Doctor Who.
Speculation over who would take over from current doctor Matt Smith had been rife, but Capaldi emerged as the front-runner in recent weeks.
He will film his first scenes in the autumn.
The 55-year-old won an Oscar in 1994 for best short film, but made his name as foul-mouthed spin-doctor Malcolm Tucker in political satire The Thick Of It.
Capaldi's appointment was revealed during a live BBC show presented by Zoe Ball, which included interviews with Matt Smith, who leaves at Christmas.
Only 10 people were said to have known the identity of the new doctor ahead of the reveal.
Speaking on the show, the actor said it was a relief that the waiting was now over.
"It's so wonderful not to keep this secret any longer," he said.
"But it has been absolutely fantastic in its own way, so many wonderful things have been happening. "It was quite hard because even though I'm a lifelong Doctor Who fan, I haven't played Doctor Who since I was nine in the playground.
"I downloaded the old scripts from the internet and read those."
Referring to his notorious character in The Thick Of It, Capaldi added: "I think Malcolm has been banished from the mirror by this Doctor Who, who certainly would not put up with any of Malcolm's language or attitude."
Matt Smith was named the 11th Doctor in January 2009, following David Tennant, but will now step aside for a more mature time lord.
Smith, 30, will also appear with Tennant, Billie Piper, Jenna-Louise Coleman and John Hurt in Doctor Who's 50th anniversary special, before his farewell episode at Christmas.
Capaldi is currently filming new drama series The Musketeers, in which he plays Cardinal Richelieu.
He will also appear in upcoming films The Fifth Estate and Disney's Maleficent.
The actor becomes the first Oscar-winner to step into the Doctor's well-travelled shoes.
