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 no madman in a box to help, Clara goes against an enemy that exists beyond normal humain perception.
Sci-fi adventure, starring Peter Capaldi, Jenna Coleman, Samuel Anderson and Christopher Fairbank .
My least favourite episode of this series… Except for the mini Tardis concept with the very funny moment when the Doctor moves it as a hermit crab.