The Bells of Saint John (TV story)

 was the sixth episode of the seventh series of Doctor Who produced by BBC Wales. It introduced a new companion to the show, although she had, in different forms, previously appeared in both TV: Asylum of the Daleks and The Snowmen. It also reintroduced the Great Intelligence, who had last appeared in TV: The Snowmen.

Synopsis
London, 2013. "Danger. This is a warning. A warning to the whole world. You're looking for Wi-Fi. Sometimes you see something, a bit like this. Don't click it. Do not click it. Once you've clicked it, they're in your computer. They can see you. If they can see you, they might choose you. And if they do... you die."

When Clara Oswald has problems with her Internet, she's given a telephone number: the number of "the best." When the Eleventh Doctor answers at the other end, Clara is pulled into a life of adventure and mystery. But danger is lurking in the signals, picking off minds and imprisoning them. Next thing you know... "I don't know where I am."

Plot
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Cast

 * The Doctor - Matt Smith
 * Clara Oswald - Jenna-Louise Coleman
 * Miss Kizlet – Celia Imrie
 * Mahler – Robert Whitlock
 * Alexei - Dan Li
 * Nabile – Manpreet Bachu
 * Paul – Sean Knopp
 * The Abbot – James Greene
 * George – Geff Francis
 * Angie – Eve de Leon Allen
 * Artie – Kassius Carey Johnson
 * Little Girl – Danielle Eames
 * Barista – Fred Pearson
 * Waitress – Jade Anouka
 * Newsreader – Olivia Hill
 * Child Reading with Comic – Isabella Blake-Thomas
 * Man with Chips – Matthew Earley
 * Pilot – Antony Edridge
 * Great Intelligence - Richard E. Grant

Story notes

 * This story takes a lot of the directing tropes of the BBC television series , a show written and created by Doctor Who show runner Steven Moffat and writers Mark Gatiss and Steve Thompson. A prime example of this is formulas and words appearing on-screen.
 * As is routine for post-2005 Doctor Who, a "NEXT TIME" trailer for the next episode is shown at the end of the episode.

Ratings
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Filming locations
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Production errors
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Continuity

 * The Doctor mentions that Angie, one of the children Clara babysits, went to stay over at Nina's. (TV: Asylum of the Daleks)
 * After saving Clara from being downloaded, the Doctor sends a message to her attempted captors stating that she's "under my protection." (TV: ''The Christmas Invasion, The Eleventh Hour)
 * Summer Falls, a book that Clara owns, was written by Amelia Williams. (TV: ''The Angels Take Manhattan)
 * The Doctor once again wears Amy's reading glasses. (TV: ''The Angels Take Manhattan, The Snowmen)
 * Miss Kizlet's client is revealed to be the Great Intelligence, which still has Walter Simeon's image despite it being over two centuries since it first took his form. (TV: ''The Snowmen)

Home video releases
to be added