The best Doctor Who story of all time? It really could be. It’d be terrible if the show was like this every week, it would be an even worse introduction to the show, but for Moffat to give over one episode to present our little children’s programme as an art house theatre production is truly electrifying.

Capaldi is in his element. It’s just him being his absolute brilliant best. A puzzle box of a story with a satisfying conclusion and an amazing character actor at the centre of it. The tension ratchets up and up and up until a big cathartic payoff at the end. One hell of a bird!