Knock Knock (TV story)

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

Synopsis
Bill and her friends rent an old house to live in, but the floorboards and the walls are creaking, and there's a creepy Landlord lurking around. Can the Doctor save the day as creatures come crawling out of the wood?

Plot
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Cast

 * The Doctor - Peter Capaldi
 * Bill - Pearl Mackie
 * Nardole - Matt Lucas
 * The Landlord - David Suchet
 * Eliza - Mariah Gale
 * Shireen - Mandeep Dhillon
 * Felicity - Alice Hewkin
 * Paul - Ben Presley
 * Harry - Colin Ryan
 * Pavel - Bart Suakvek
 * Estate Agent - Sam Benjamin
 * Young Landlord - Tate Pitchie-Cooper

Crew
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Culture

 * The figure behind the Vault can play the piano.

Technology
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Science
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Species

 * The Doctor calls the woodlice Dryads.

Foods and beverages
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People

 * Asking The Landlord who is the Prime Minister, the Doctor lists Margaret Thatcher, Harriet Jones, Wilson and Eden.

The Doctor

 * The Doctor offhandedly mentions regeneration to Bill; he avoids elaborating on it.

TARDIS
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Locations
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Music

 * The figure behind the Vault plays Für Elise by Beethoven and Pop Goes The Weasel, a famous nursury rhyme, on a piano.

Story notes

 * David Suchet said in The Fan Show Aftershow that he used a real life experience of being covered in woodlice for the scene where the Dryads come crawling all over The Landlord.

Ratings
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Filming locations
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Production errors
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Continuity

 * The Doctor mentions Prime Minister Harriet Jones, who ascended after aiding his ninth incarnation in defeating the Slitheen. (TV: Aliens of London/World War Three) His tenth incarnation, however, would set in motion her deposition after she ordered the destruction of the retreating Sycorax. (TV: The Christmas Invasion) She would help save the world one final time against the Daleks. (TV: The Stolen Earth)
 * The Doctor reveals he's a Time Lord. (TV: The End of the World etc. all)
 * The Doctor mentions regeneration, but glosses over it, similar to how his tenth incarnation did such with Martha Jones in regards to his race. (TV: Gridlock)
 * Bill introduces the Doctor as her grandfather. The Doctor once travelled with his granddaughter Susan Foreman, who called him grandfather. (TV: An Unearthly Child - The Dalek Invasion of Earth, The Five Doctors)
 * Bill's sexuality is brought up once more. (TV: The Pilot)
 * One of the flat mates theorise dolls could be creeping around upstairs. The Doctor encountered a house of dolls in his eleventh incarnation. (TV: Night Terrors)
 * The Vault is tended to by Nardole once more, the Doctor revealing a piano is inside. (TV: The Pilot, Thin Ice)

DVD releases
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Blu-ray releases
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Digital releases
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