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 IX 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.

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.

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 Library of Blasphemy 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

 * 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.
 * 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 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)
 * 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 was previously aided by a virtual copy of himself in COMIC: A Life of Matter and Death.

DVD releases
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Blu-ray releases
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Digital releases
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