0 1 min 10 yrs

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.

Christopher Fairbank guest stars.

Doctor Who: Flatline airs on Saturday, 18 October at 8.25pm on BBC One.

Click on any image to open gallery:

(C) BBC / Adrian Rogers

Watch the trailer below…