'Actor Peter Capaldi has been announced as the new star of BBC sci-fi series Doctor Who. The Glasgow-born star will be the 12th actor to play the Doctor, replacing outgoing star Matt Smith. He is best known for his role as foul-mouthed spin-doctor Malcolm Tucker in the BBC series The Thick of It. "It's so wonderful not to keep this secret any longer, but it's been so fantastic," Capaldi said after the news was revealed on a live BBC One show.'