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Extremis: The Fact File

Filming for Extremis began on Wednesday, 23 November, 2016, exactly 53 years after the very first episode of Doctor Who aired. It wrapped after Christmas on Tuesday, 17 January, 2017.

River and her diary in The Husbands of River Song

‘Domestic bliss on Darillium… That’s the word among the Daleks.’ Darillium was the planet where the Doctor and River spent time together following the defeat of King Hydroflax. It was first mentioned in Forest of the Dead when River revealed, ‘You took me to Darillium to see the Singing Towers. What a night that was…’

When Nardole meets the Doctor disguised as a cleric, he’s carrying River Song’s diary. She used the book to chronicle her adventures with the Doctor and when the two friends bumped into each other she would often consult it to get a fix on whereabouts in their personal time lines they stood. It was first seen in another episode set largely in a library – 2008’s Silence in the Library.

Pope Benedict IX, referenced by Angelo and the Doctor, was one of the most controversial figures in the history of the Catholic Church. He remains the only pontiff to have been Pope on more than one occasion and was ultimately excommunicated.

Extremis is Latin and most commonly used in the phrase ‘in extremis’ meaning at the point of death, or more literally, at the furthest (or end) extreme.

Extremis is directed by Daniel Nettheim who previously helmed The Zygon Invasion / The Zygon Inversion. His uncle, actor David Nettheim (1925 - 2008), played Fedorin in the Second Doctor adventure, The Enemy of the World.

The Pope is played by Joseph Long who previously starred as Rocco Colasanto in the 2008 story, Turn Left. And Jennifer Hennessy returns as Moira, the character first seen in The Pilot.

Jamie Hill as the Foretold in Mummy on the Orient Express

Jamie Hill – the Monk in Extremis – is no stranger to Doctor Who. He played the Foretold in the Mummy on the Orient Express and one of the Silence in series 6.

CERN is an actual organisation, also known as the European Organization for Nuclear Research. It operates the planet’s largest particle physics laboratory and the World Wide Web began as one of its projects. You can get a flavour of CERN’s work here.

‘On my oath as a Time Lord of the Prydonian Chapter…’ The Chapter was first mentioned in The Deadly Assassin when it was revealed that the Doctor was one of its members. On Gallifrey, Prydonians had a reputation for being notoriously devious, although Goth (who was a member of that ‘noble Chapter’) denied this, claiming, ‘We simply see a little further ahead than most.’