Series: 8

Original Air date:  October 18, 2014

Number Doctor: 12th

Companion(s): Clara Oswald

Writer(s):   Jamie Mathieson

Director(s):  Douglas Mackinnon

Guest Stars:
Samuel Anderson as Danny Pink
John Cummins as Roscoe
Jessica Hayles as PC Forrest
Joivan Wade as Rigsy
Christopher Fairbank as Fenton
Matt Bardock as Al
Raj Bajaj as George
James Quinn as Bill
Michelle Gomez as Missy

Synopsis: 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.

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