Series: 9

Original Air date:  November 28, 2015

Number Doctor: 12th

Companion(s): Clara Oswald

Writer(s):   Steven Moffat

Director(s):  Rachel Talalay

Guest Stars:
Jami Reid-Quarrell as Veil

Synopsis: The Doctor, alone and depressed, finds himself inside a nightmarish castle seemingly created to terrify him. However, as the Doctor soon finds out, everything is not quite what it seems to be. The Doctor must solve the riddle of his prison in order to find out where he is and why he is there.

Last Episode
Guide
Next Episode