I was fully prepared to really enjoy Extremis. Preview interviews had Moffat gushing about how it was mixing conspiracy theories, video games, and "puzzle box" plotting. These being things I'm interested in I thought the episode would easily be my most enjoyed of the series so far. And it was. But that was mostly because the previous five episodes never really rose above average, and it wasn't anywhere near as interesting as I thought it would be.
Part of this is my problem for setting expectations based on things that have been said in interviews (and it should be noted that Moffat has a particularly poor (or good, depending on how you look at it) record of overplaying his hand when previewing episodes). Hearing the sources of inspiration for the episode's writer got me to imagine a particular direction for the episode. There's nothing specific to mention here. I just felt that the conspiracy would be cleverer, the video game inspiration more overt. The puzzle box plotting was about as good as I expected it to be, to be fair. Inevitably I was disappointed when what aired didn't meet my expectations.
While this is my problem it doesn't change the fact that the episode wasn't terribly ambitious. Mentioning that conspiracy theories and video games are sources of inspiration for a TV show invokes certain aesthetics and themes. It would be a problem for any show. It's particularly troubling for Doctor Who (essentially an anthology series) because these are fresh sources of material that offer opportunities for doing new and exciting ideas within the show. It feels wasteful not to fully delve into these subjects, exploring and subverting their tropes and standard approaches. A modern Doctor Who episode with a genuine conspiracy theory at the centre could be amazing. What we got was anything but. Truth be told I can't even articulate what I think the conspiracy theory was meant to be beyond "some self-consciously mysterious humanoids have created a super-advanced computer programme because they're invading the Earth." Does that even qualify as a conspiracy?
The video game stuff was slightly better. What we got was people committing suicide because they found out they were NPCs. Which is a really interesting idea to explore in a fifty minute action-adventure drama. Only it wasn't explored. It was an incidental detail there to up the stakes for an aliens-invade-Earth story. Which on the one hand is a fair enough explanation, but on the other hand is hardly Doctor Who breaking new and exciting ground. The basic ideas were there for this to be a bold, experimental and memorable episode. Instead it felt like a reworked script from the Silence storyline, with the red robed monks in place of the Roswellian Slendermen, Moffat doing his usual puzzle box approach (which is his greatest strength as a Doctor Who writer so, y'know, fine) with new ingredients. Ultimately that's really, really disheartening.
Even though the plot wasn't up to much it did serve it's leads well. Pearl Mackie was given a greater range of things to do in this episode than she has been in any other and she was excellent in every scene. Peter Capaldi was given comparatively less to do but was still eminently watchable. He even managed to make me postpone rolling my eyes at the Doctor getting his sight back1. Matt Lucas as a "badass" though? Yeah, I get the joke but it still made me cringe. Meanwhile the scenes with Missy were a waste of perfectly good Michelle Gomez.
Extremis has been advertised as the opening part of a loose trilogy of episodes. All are to feature the red robed monk characters introduced here. While they are, as already noted, very similar in function to the Silents they do at least boast a strong design and there's still time for them to turn into worthwhile enemies. I'd say that the hints at dystopian futures and alternate histories across the next two episodes sound good but that's the kind of thinking that led to my disappointment in this underdeveloped waste. Let's just hope that the so-called monk trilogy as a whole does a better job of meeting its potential than it's opening act did alone.
1 In hindsight (not an intentional gag) the Doctor losing his sight one week and being confronted by a book which makes people kill themselves the next is a particularly Moffat thing to do. I'm surprised the irony wasn't hammered home far more.