Oxygen (TV story)

 was the fifth episode of the tenth series of Doctor Who produced by BBC Wales.

Most notably, in this episode, saving Bill robs the Doctor of his sight, rendering this incarnation, potentially, permanently blind.

This shows the risks he often places himself in, in order to save his friends, but also the danger in which he might be leaving Earth, should he not return, alive and in good health. Oxygen represents a tipping point in the St Luke's vault arc, as the Doctor finally faces the consequences of not having taken his vow seriously.

Synopsis
The Twelfth Doctor, Bill and Nardole investigate a strange space station, but are interrupted by walking dead in spacesuits... will they make it out alive? And how much does air actually cost?

Plot
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Cast

 * The Doctor - Peter Capaldi
 * Bill - Pearl Mackie
 * Nardole - Matt Lucas
 * Ivan - Kieran Bew
 * Tasker - Justin Salinger
 * Dahh-Ren - Peter Caulfield
 * Abby - Mimi Ndiweni
 * Ellie - Katie Brayben

Uncredited cast

 * Student - Lauren Pate

Physics

 * The Doctor gives a lecture about space, while the audience was expecting a lecture about crop rotation.
 * He describes how one dies when exposed to the vacuum of space.

Chemistry

 * The boiling point of water is much lower in a vacuum.
 * Electrolysis is splitting water into hydrogen and oxygen. Nardole assumes this is the Doctor's plan, to produce more oxygen which would last 5 minutes.

Biology

 * The Doctor purposely "maxes out" his companions' adrenaline: "Fear keeps you fast. Fast is good."
 * Fear also causes an acceleration in breathing, though, which would constitute a waste of oxygen credits while on Chasm Forge.
 * Bill wonders what happens if she were to throw up in the space helmet.
 * After having been exposed to the vacuum of space, Bill suffers from oxygen deprivation.
 * The Doctor says he has spare eyes in the TARDIS, though they're from lizard.

Technology

 * The Doctor calls distress calls "[his] theme tune", and emphasises that "You only see the true face of the universe when it's asking for your help."
 * Chasm Forge uses artificial gravity.
 * The Doctor is happy that the "space doors", as Nardole calls them, are of a classic design. They have pressure seals and hinges. He and Nardole disagree on whether space doors should go "shk shk" or "nnnnn".
 * The smartsuits employed at Chasm Forge uses gyros stabilisers, magnetic boots and gloves, and has on-board computech. According to the Doctor, it can run, jump and update one's Facebook. They also have force fields to keep the air in, and oxygen tanks for air supply.
 * A magnetic glove on one of the active suits destroys the Doctor's sonic screwdriver, though the sonic also fries the suit.
 * The suits' AI have "limited problem solving".
 * To send the distress call, the miners boosted a smartsuit through the dish.
 * Nardole relates the smartsuits' nav system to "when your satnav doesn't know a new road".

Medicine

 * The Doctor claims he has "stuff in [the TARDIS] that'll cure anything".

TARDIS

 * The Doctor once told Nardole that the TARDIS can't go anywhere without the fluid link K57. However, he reveals this to be untrue.
 * The air shell room in the TARDIS can provide oxygen to enough of the space station for them to stroll around.

Travelling

 * The Doctor compares going to outer space to camping, and refers to tents and campsites.
 * Bill asks if there are reviews for space locations, like there are online for restaurants.

Units of measurement

 * Distance is measured in average breaths, rather than in metres.

Locations

 * The Doctor sent Nardole to Birmingham for a packet of crisps.
 * Chasm Forge is a mining station in outer space. It has a crew of 40.
 * The surviving workers ask the Doctor to drop them off at head office.

Business and economics

 * The smartsuits are made by Ganymede Systems.
 * Ganymede provides oxygen for personal use only, charging credits for air, and making breathing into a capitalist endeavour. Unauthorised oxygen is automatically expelled, to protect market value.
 * The Doctor sees the endpoint of capitalism as "a bottom line where human life has no value at all".
 * He remarks that, "like every worker everywhere, we're fighting the suits."

Resources

 * Chasm Forge is a station for mining copper ore.
 * The managers of Chasm Forge are seeking a bottom line for oxygen usage, and are seemingly prepared to kill off and replace workers if they're using too much of it.

Foods and beverages

 * The Doctor says that in five whole minutes, "we could boil the hell out of an egg."

People

 * Nardole recognises Bill's smartsuit's interface voice as his ex Velma, and remembers her as a "nice girl, actress. Bit orange, left me for an AI at a call centre."
 * As a result of saving Bill from dying through exposure to the vacuum, the Doctor has now become blind. An attempt to return his vision was made, but only the colour in his eyes returned.

Time Lords

 * Time Lords can survive in the vacuum of space longer than humans can. In the Doctor's case here, he survived but lost his sight.

Literature

 * The Doctor says, "Death, where is thy sting?", quoting the in the New Testament.
 * Bill reads a book called Leonardo, on Leonardo da Vinci. This book has the image of the Mona Lisa on its back cover.

Culture

 * The Doctor mentions, amongst other things the smartsuits can do, updating Facebook.
 * Dahh-Ren cannot understand why Bill would experience racism herself. He suspects her to be racist because of her reactions to his blue skin.
 * Nardole says that "some of my best friends are bluish".
 * The Doctor insinuates that the purpose of jokes, in general, is to distract people from whatever's about to kill them.
 * The Doctor jokes that "too many rescue ships" is a "first-world problem".
 * The Doctor quips that he thought he was just tweeting, rather than locking the crew out of the subroutine.

Story notes

 * Two scenes of the blind Doctor were featured in an early teaser shown at the end of The Return of Doctor Mysterio, except his eyes weren't cloudy in order to not to spoil this plot point.
 * On The Fan Show, Jamie Mathieson worried that this episode would turn out "too political", due to its blatant anti-capitalist themes.
 * The read-through for Oxygen took place on 12 October 2016 (immediately after Capaldi and Mackie returned from promoting series 10 at the 2016 New York Comic Con and in Toronto, Ont.), and filming on the episode took place between 17 October and 18 November.

Cast

 * Three out of the five guest actors, this episode, had previously voiced roles in Big Finish Doctor Who or Bernice Summerfield. Namely, Kieran Bew was in The Lady of Mercia and The Helm of Awe, Peter Caulfield was in Cold Fusion, and Mimi Ndiweni was in Big Dig.
 * On The Fan Show, Jamie Mathieson said that an ongoing joke on set was calling Peter Caulfield "Blue Peter", due to his character being blue. This was a reference to Blue Peter.

Allusions

 * Two references to Star Trek are made:
 * The Doctor makes a speech about space being "the final frontier", quoting the monologue that opens each episode of Star Trek: The Original Series and Star Trek: The Next Generation.
 * Nardole mentions the "Swish Swish" sound the doors always make. The Doctor says he hates that noise.
 * While standing with Dahh-Ren, Nardole states that some of his best friends are "bluish". This joke, of calling a blue person "bluish" as if it is their race, was first seen in the 1969 Beatles animated film, where it was used by a Blue Meanie in an attempt to identify if the Beatles were a member of their ranks. The original use was meant as a satire of the then-common phrase "you don't look Jewish", but it was not intended to be derogatory.

Ratings
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Filming locations
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Production errors
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Continuity

 * The Doctor wears his sonic sunglasses again. (TV: The Magician's Apprentice - The Husbands of River Song, The Pilot)
 * Nardole once more stresses the Doctor's oath to stay on Earth to guard the vault. (TV: The Pilot, Smile, Thin Ice, Knock Knock)
 * The Doctor once more gives a lecture. (TV: The Pilot)
 * The Doctor and his companions are almost sucked into the vacuum of space. (TV: The Daleks' Master Plan, The Impossible Planet, Voyage of the Damned)
 * The Doctor refuses to believe he can't save his companion. (TV: Voyage of the Damned)
 * The Doctor previously faced an enemy that hijacked spacesuits to control them. (TV: Silence in the Library/Forest of the Dead)
 * Bill mentions being on the receiving end of racism, (TV: Thin Ice) and is accused of racism herself. Dahh-Ren is surprised by this, unsure of why Bill would be persecuted.
 * A picture of Bill's mum is seen again. (TV: The Pilot, Knock Knock)
 * The sonic screwdriver is broken. (TV: The Visitation, Smith and Jones, The Eleventh Hour, A Christmas Carol, COMIC: The Tragical History Tour)
 * Time Lords can survive in a vacuum for limited periods of time, (TV: Four to Doomsday, The Doctor, the Widow and the Wardrobe, GAME: TARDIS) far longer than humans can.
 * The TARDIS extends its airshell so those around the outside of it can breathe (TV: The Runaway Bride, The Beast Below, GAME: TARDIS)
 * The Doctor says that fear is good. He previously described it as a superpower (TV: Listen) and as a generator of savagery. (TV: Amy's Choice)
 * Nardole removes the Doctor's fluid link in an attempt to keep him grounded on Earth. (TV: The Daleks)
 * The Doctor has previously encountered blue humanoids. (TV: The End of the World, A Good Man Goes to War)

DVD releases
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Blu-ray releases
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Digital releases
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