Extremis (TV story)

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

Most notably, the episode revealed that was inside the vault beneath St Luke's University. It also explained how Nardole came to travel with the Doctor after the events of The Husbands of River Song.

Synopsis
The Vatican asks the Twelfth Doctor to investigate a mysterious book called the Veritas. All who read the Veritas immediately kill themselves. When a translation of the Veritas is leaked online, the Doctor must face up to the inevitable truth...

Plot
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Cast

 * The Doctor - Peter Capaldi
 * Bill - Pearl Mackie
 * Nardole - Matt Lucas
 * - Michelle Gomez
 * Moira - Jennifer Hennessy
 * Cardinal Angelo - Corrado Invernizzi
 * The Pope - Joseph Long
 * Penny - Ronke Adekoluejo
 * Rafando - Ivanno Jeremiah
 * Piero - Francesco Martino
 * Pentagon Woman - Alana Maria
 * Nicolas - Laurent Maurel
 * Monk - Jamie Hill
 * Voice of the Monk - Tim Bentinck

Crew
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Time Lords

 * Time Lords have two hearts and three brain stems.
 * One stipulation of the Fatality Index is that a death sentence of a Time Lord must be carried out by another Time Lord.

People

 * Pope Benedict x made a personal recommendation for the Doctor in 1045. He remembers Pope Benedict, and recalls, "I knew she was trouble, but she wove a spell with her castanets."
 * The Pope pays the Doctor a visit in the lecture hall.
 * The Virtual Doctor says that the Pope doesn't "zoom around in the Popemobile, surprising people".
 * Virtual Bill brings Penny home on a date. Penny runs away after seeing the Pope in Bill's bedroom.
 * Virtual Bill thought that Virtual Moira would be out with Harry tonight, who is actually named Howard.
 * The last emails sent before the translator kills himself were, chronologically, to Abramo Tognaccini (We have been tricked by the devil–in French), Daryn Mcloughlan (Pray for your family), Phil Bond (Pray for us all tonight), Franco Esposito (The world is not what we think–in French), Christina Tom (Farewell), Kevein Paters (Chapel Day), Albertina Ricci (Pray for us all–in French), Bill Pullman (Thursdays meeting), Peter Dukes (The devil's work has been done), Nicia Russo (We have been tricked), Michael Finch (Missed meeting), Stefan Anchorage (Farwell on this earth–in French), and, finally, four hours before death, to CERN European Organization for Nuclear Research, VERITAS, containing the translated text.

Technology

 * The Doctor gets an email on his sonic sunglasses.
 * The Doctor also uses his sonic sunglasses to scan people's data, as he cannot see them.
 * Data the Doctor can detect are:
 * Gender (male and female)
 * Age (in years)
 * Height (in centimetres)
 * Weight (in pounds)
 * Heart rate (in BPM)
 * Temperature (in degrees Celsius)
 * He can also get a sense of the architecture around him, again using the sonic sunglasses.
 * The Doctor also employs a reading aid with circular Gallifreyan script on it. He confirms that it's deadly.
 * The Doctor implies that swings and roundabouts are also deadly.
 * Bill notes that the Hereticum has WiFi, and the Doctor says of course it does; it's a library.
 * According to a plaque at CERN, its Large Hadron Collider, which was first tested on 10 September 2008, is the world's largest and most powerful particle accelerator. It has a diameter of 27 kilometres, and, to work, requires the magnets to be cooled at -271.3°C—a temperature colder than outer space. To achieve this, much of the accelerator is connected to a distribution system of liquid helium, to cool the magnets, as well as to other supply services.

Organisations

 * CERN is the largest particle physics laboratory on the planet.
 * The Pentagon is the headquarters of the United States Department of Defense,, located in Arlington County, Virginia

Religion

 * Suicide is understood to be a mortal sin in Catholicism, leading one to hell.
 * Pope Benedict said that the Doctor was "more in need of confession than any man breathing", but when the offer was made, the Doctor replied "it would take too much time".
 * The Doctor says that religion is "designed to confuse the uninitiated", as Angelo says of the layout of the Hereticum.

Locations

 * Nardole tells Bill that the Vatican is in Rome, which is in Italy.

Culture

 * Virtual Bill exclaims "Harry Potter!" upon seeing the Hereticum for the first time.
 * Nardole says that the Doctor and Angelo would be "wizard" at writing Christmas crackers, when, together, they say, "Truth in the heart of heresy" / "And death in the heart of truth".
 * The virtual Doctor likens the inhabitants of the practice Earth finding out they are a simulation and committing suicide as a result to a hypothetical scenario in which "Super Mario realises he's inside a video game".

Story notes
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Ratings
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Filming locations
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Production errors

 * Outgoing emails on the laptop are shown, when in fact the inbox, rather than the outbox or sent messages, is open on the left panel.
 * The reflection of a cameraman can be seen on the TV at CERN, when the camera pans in on the bomb countdown just before detonation.

Continuity

 * Reference is made to Time Lords' binary vascular system, (TV: Spearhead from Space, et al.) and it is stated that they also have three brain stems. In TV: The Magician's Apprentice, suggested that she only had one brain stem.
 * Missy mentions "domestic bliss on Darillium", (TV: The Husbands of River Song) as "the word among the Daleks." (TV: The Witch's Familiar)
 * The Doctor is still experiencing blindness. He lost his sight in the vacuum of space, saving Bill's life. (TV: Oxygen)
 * The Doctor is brandishing a new sonic screwdriver. His previous sonic, of the same design, was destroyed in TV: Oxygen.
 * The Doctor promises to guard Missy "on my oath as a Time Lord of the Prydonian Chapter". Spandrell once referred to the Doctor as a "Prydonian renegade, and mentioned "Prydonian vows". She said that "when a Prydonian forswears his birthright, there is nothing else he fears to lose." (TV: The Deadly Assassin, PROSE: Lungbarrow)
 * A plaque at CERN reveals that the large Hadron Collider "first started up" on 10 September 2008. Jack Harkness was present, with his Torchwood Three time of Gwen, Ianto and Martha, when this first test opened a portal to another reality, through the LHC, and let out some neutron eaters. (AUDIO: Lost Souls)
 * The Third Doctor's companion Liz Shaw joined CERN after leaving UNIT in the 1970s. (PROSE: Country of the Blind)
 * The virtual Doctor sits in the President's chair in a holographic recreation of the Oval Office. The Eleventh Doctor previously did just that in the real Oval Office. (TV: The Impossible Astronaut)
 * The virtual Doctor uses the sonic sunglasses to send a message. The Doctor used them to get out of an impasse before. (TV: Before the Flood) He also used them to summon reinforcements on Gallifrey. (TV: Hell Bent)
 * The Doctor was previously aided by a virtual copy of himself in COMIC: A Life of Matter and Death.
 * The Hereticum is a library of heretical and forbidden works maintained by the Vatican. Since his First incarnation, the Doctor has also been a patron of the Library of St John the Beheaded, a similar collection also established by the Vatican, which was hidden in London. (PROSE: All-Consuming Fire, White Darkness, Millennial Rites, The Empire of Glass, Dragons' Wrath; AUDIO: Zagreus, No Place Like Home.)

DVD releases
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Blu-ray releases
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Digital releases
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