He manages to play this same grimly ominous tone for laughs (one bit where he swoops owlishly out of shot like a comedy vampire, and another where he stops all conversation by asking with alarm and then delight, “what’s that smell?…is that Chinese food?”) and chills (reading off the names of the Landlord’s previous victims, then grinning icily and asking “where are they?”). Capaldi is magnificent throughout this story, in what is for my money his best performance to date as the Doctor, seamlessly switching from “see, I’m good at making friends” moments where he tries to ingratiate himself to Bill’s friends with her Spotify playlist and bluff his way through pretending he knows her music (inadvertently revealing her guilty pleasures) to deadly serious Doctor face where we can see he’s investigating something. Well, it’s definitely important to this horror story, because it provides a ton of personality and humor to the first half hour of the story, when the Doctor shows up to help Bill move in with her new friends, and stays to follow up on his unerring instinct for extraterrestrial danger. We’ve seen haunted mansions before (“Image of the Fendahl” and “Ghost Light,” not to mention “Hide”) and we’ve seen gruesome body horror (“The Crimson Horror”), and we’ve even seen alien woodlice (“Frontios”), but this is the first time we’ve seen that most important of horror tropes: six young adults falling victim one by one to a sinister family secret. But it might also make sense to regard it as a show where every episode might be a different genre unto itself.ĭoctor Who has always done horror extremely well, for instance, but “Knock Knock” is perhaps its most modern stab at the genre.

This might lead us to think of Doctor Who as being more in the vein of science fantasy, in the same family as Star Wars. And of course there’s 2006’s “The Impossible Planet / The Satan Pit,” featuring a creature which makes a pretty good claim to being, if not Satan himself, a reasonable facsimile thereof.

Then there’s 1982’s “Kinda,” one of my favorite Doctor Who stories of all time, in which the antagonist is an intelligent serpent demon from another dimension who possesses people through their dreams and can be (temporarily) defeated by imprisoning it in a circle of mirrors. 1968’s “The Mind Robber” is one of the earlier examples, an adventure which takes place in “The Land of Fiction” and includes threats that disappear if you are determined enough not to believe in them, which is pretty much the opposite of how one would normally define reality. Doctor Who is usually considered to be science fiction, largely due to the framing device of time-and-spaceships from another planet, but even though most stories try valiantly to bash out a sciencey-sounding explanation for everything that happens, there’s usually a point where this attempt ends up being fruitless.

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