Flatline synopsis

The BBC have released the official episode synopsis for Doctor Who Series 8 Episode 9, Flatline. Check it out below.

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.

Flatline airs at 8.25pm, Oct 18 on BBC One. For more info, pics and clips from the story, click HERE.