If you have already watched or read about Dark Water you already know some of these, so it’s safe to get an Inside Look (thanks to BBC America) at eleventh episode of series 8 with exclusive interviews with stars Peter Capaldi and Jenna Coleman.
“I think it’s probably the first time that we see a companion properly go mad and lose their mind effectively.”
Separated from the Doctor, Clara discovers a new menace from another dimension. But how do you hide when even the walls are no protection? With people to save and the Doctor trapped, Clara comes up against an enemy that exists beyond human perception.