*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…