Doctor Who: Extremis

"Do not, under ANY circumstances, put the Pope in my bedroom!"

This is something of a gear-changing episode, obviously. shifting suddenly from story-of-the-week mode into a much bigger foregrounding of the season arc in ways we both did and didn't expect. It's also perhaps our last chance to get one of Moffat's "clever" episodes while he's still showrunner and without a season finale looming. The result is a triumph on those terms, yes, but also in terms of both character and spectacle.

The episode concerns a text, the Veritas, within the Vatican's secret library of forbidden texts (yes, that old stand-by), the Haereticum, which causes everybody who reads it to kill themselves. This is, as you might imagine, rather concerning to our red-hatted friends, so much so that the Pope himself personally arrives to ask for the Doctor's help, leading both to the unfolding of the plot and comments from the Doctor about his old 11th century friend Pope Benedict IX (a real person, incidentally) being a "lovely girl". And it's also an irresistible chance to have Bill's date with a lady she rather fancies being rudely interrupted by said Pontiff emerging from the TARDIS. It's a great start.

But all this is juxtaposed throughout by scenes of the Doctor setting out to execute none other than Missy by Max from Humans, ending with his sabotaging the execution to be non-fatal. (We can't have the Doctor endorsing something as barbaric as capital punishment, and nor can River Song, who conveniently sens Nardole with a message to that effect which also happens to explain how Nardole happened to be travelling with the Doctor- but didn't the Doctor resurrect him?) The result of all this is that Missy's 1,000 year sentence takes place not, as originally intended, with her being dead, but with her being the mysterious figure the Doctor's been guarding in the Vault and, yes, as fans we were sort of expecting this, but we should remember that the general viewer probably hasn't.

Oh, and the Doctor begins and ends the episode still blind. It seems that they're running with this.

The big reveal is, I think, not supposed to dwell on the metatextual angle which is, if anything, downplayed, but the horrible truth is that the world is literally not real, just a very good simulation created by a badass-looking race of alien monks who are practising their invasion of the real Earth- they are literally all just characters in a video game. It's a glorious and very Moffat idea, good enough to mean that we necessarily have a great big reset button being pressed as the simulation Doctor warns the real Doctor that the monks are coming next episode. This already impressive season has, if anything, just got even better.