Officially, the plot is simple -- a Dalek malfunctions and develops a moral code, and the obvious solution is to re-enact the 1987 cult hit "Innerspace." “The most dangerous place in the universe," we're told, although I think the people on the outside of the Dalek would disagree. Cue lots of eerie lighting, croaks of "Exterminate!" and a chance for the Doctor to scoff at soldiers. Really this is a chance for Peter Capaldi, somewhat wasted in his first proper appearance, to shine.