This is the best episode of Series 10 and one of the best of the Capaldi era, and it manages it on a small set with a handful of actors and a monster that is, essentially, a jacket. “Oxygen” is a base-under-siege story with the safety catch removed: genuinely frightening, properly paced, morally furious, and willing to end on a permanent injury to its lead that the show then actually honours for the next three episodes. It’s also the angriest thing Doctor Who has broadcast in a very long time.
The premise is one line and it does everything. On the mining station Chasm Forge the air is not free. The station is deliberately unpressurised, the crew wear smart spacesuits which supply oxygen, and that oxygen is metered, billed and deducted from wages. You are charged for breathing, so breathe efficiently and you profit, breathe badly and you owe. Everything else follows with horrible logic. The suits are the company’s property rather than the crew’s, they contain the crew rather than protecting them, and when the corporation’s algorithm determines that the human workers have become less efficient than the equipment they’re wearing, the suits are issued an instruction to deal with the surplus. So they kill the crew, and then keep walking, because the bodies are still perfectly serviceable labour once the awkward organic part has stopped complaining. The image is superb: dead miners shambling through corridors, arms out, faces slack behind visors, moving with the deliberate gait of something being driven from outside. They aren’t zombies. The suits are simply finishing the shift.
The Doctor’s summary is the thing everyone will remember: this isn’t a malfunction, it’s the market. The suits are not broken, they are performing a cost analysis correctly, the crew were made redundant in the most literal possible sense, and the company will be along shortly to collect the equipment. Jamie Mathieson’s script never softens this into a comfortable moral. There’s no rogue executive to blame and no computer that went mad, there’s an accounting decision executed by machinery, and the episode’s clear position is that the horror is the ordinary functioning of the system rather than a fault in it. When the survivors work out the actual solution, making themselves more expensive to kill than to keep alive, it isn’t a triumph, it’s a negotiation with a spreadsheet. That’s a genuinely bleak thing for a family show to argue, and “Oxygen” argues it without flinching or apologising.
The cost
The reason it lands is that the episode charges real prices. Bill’s suit is faulty from the start, a slightly-too-large helmet that keeps failing, and the episode plays that for tension repeatedly before cashing it in. In vacuum, with her suit dead, the Doctor gives her his helmet. She survives. He doesn’t get away with it, because exposure to hard vacuum burns out his eyes and he is blind for the rest of the episode. And then he stays blind. He fakes his way through the ending, hides it from Bill, admits it to Nardole in the last scene. After a run of stories that undid their own consequences, the button in Journey to the Centre of the TARDIS and the memory wipe in Smile, a show that lets its lead pay for a decision and keeps the bill on the table is enormously welcome.
There’s also a beat where Bill, thinking she’s dying, is furious rather than tearful, and Pearl Mackie plays it with real bite. She has spent five episodes finding this wonderful, and here she works out that it is also a job where you die in a corridor for somebody else’s quarterly figures. The survivors are thinly drawn but purposefully so, and one detail is worth flagging: Dahh-Ren is blue-skinned, and when Bill reacts to him the episode plays out a very short exchange in which she assumes she’s caused offence, he explains that his species stopped caring about that particular distinction a long time ago, and everyone moves on. It’s four lines, it’s funny, and it quietly does the thing the episode is about, because the future has not abolished prejudice, it has simply moved on to sorting people by productivity instead. The teaching dynamic between the Doctor and Bill gives the hour its other shape. He’s brought her here as a lesson, that space is trying to kill you always and everything else is detail, and the episode is built as a seminar that goes catastrophically wrong. He lectures her about vacuum exposure in the opening minutes and then has to watch her experience it, which is a nastier version of the same joke Thin Ice made about handing her the decision: he keeps constructing object lessons and keeps discovering that the object is a person he’s now responsible for.
Small and tight
It’s a model of economy. One station, one corridor system, a crew of four survivors, a countdown measured in units of breath, and a threat that walks slowly and never stops. There’s no subplot, no runaround, no comic relief beyond Nardole’s grumbling. Charles Palmer directs the vacuum sequences properly, sound dropping out, the crawl along the hull, the suits closing in from both ends, and the decision to make the monsters slow is exactly right. Nothing here needs to sprint, because they have all the time in the world and you have about eight minutes of air. The one place it strains is the ending’s speed, since the corporate reckoning is dispatched in a couple of lines of voiceover and the idea that the survivors marched into head office and brought the company down is asserted rather than shown. Given the ferocity of everything before it, a slightly less tidy ending would have served better.
The title is the sharpest thing about it. Oxygen is the one commodity in the episode, the murder weapon, the currency, the countdown and the reason everybody is there, and it’s also the thing that is, on any planet with an atmosphere, free. The station’s entire economy rests on artificially withholding something abundant and then selling it back at a rate that ensures nobody can ever stop working. Nothing about that requires a science fiction premise to recognise, which is precisely why it stings.
Rating: 4.5/5. Lean, frightening, superbly directed and genuinely furious, with the best single premise of the Capaldi years and a consequence the series has the nerve to keep. It drops half a mark for a resolution that wraps the corporate reckoning up in narration, but everything else here is Doctor Who operating at full strength. The suits weren’t broken. They ran the numbers, found the crew wanting, and carried on working without them.