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?

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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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)
 * 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)

DVD releases
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Blu-ray releases
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Digital releases
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