*SPOILERS* I wonder if there was a thematic echo of last week’s ‘Let me be brave’ motif as, a mere two weeks after the failed experiment of “Sleep No More”, Steven Moffat brings us another bold twist on the usual “Doctor Who” format? Materialising in a mysterious fortress, the Doctor finds himself stalked by an eldritch half remembered creature from his childhood nightmares. But why has he been…

*SPOILERS* Not a fan of the sonic shades? Then today’s your lucky day, as they’re quickly disposed of by an irate Viking (The post credits ‘Next Time’ sequence hints they’ll be back though). And all of this happens after the Doctor has already defeated four and a bit battle fleets and saved Clara from asphyxiation and death by love sprite. It’s a whirlwind start to an episode that’s cunningly a…