It’s an emphatic statement about the chief thematic concern of Capaldi’s era – what does it mean to be the Doctor? Leaving Clara as a Doctor analogue in her own right was, of course, the only way it could end. In the wake of Peter Capaldi’s regeneration, this story takes on a further significance; with the Twelfth Doctor’s final words, advice to his future self, mirroring the advice he gave to Clara, it’s another clear affirmation of Clara’s status as a Doctor herself.
700ish words, and really I only barely scratched of why this episode is just so darn good. I really love this one – I always find it difficult to answer questions of favourites when it comes to Doctor Who, but honestly, this one is up there.
I’d like to write more about it really. I suspect I probably will, actually. We’ll see.