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Knock Knock was the fourth episode of the tenth series of Doctor Who produced by BBC Wales. This was the first Doctor Who story to be made available with a binaural 360 soundscape, released on iPlayer.

The episode expands the Doctor and Bill's relationship briefly when he tells her about the Time Lords, the alien race he belongs to and quickly mentions regeneration to her, but doesn't explain what regeneration actually is to her.

Synopsis Edit

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 Twelfth Doctor save the day as creatures come crawling out of the wood?

Plot Edit

Bill and her friends are at an estate agent looking for a home. After failing to find one, they are confronted by The Landlord who offers them a large house to live in. They sign the contract given by the Landlord to rent the house. Pavel goes up to his room and starts to play some classical music. The Dryads come out of the walls and devour him as the audio begins to skip.

Bill is in the TARDIS with the Twelfth Doctor, who wants to see Bill's house. He helps her move her stuff into the house, but then is asked to leave by Bill saying that she'll go on more TARDIS adventures later but for now she wants to settle.

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Cast Edit

Crew Edit

General production staff

Script department

Camera and lighting department

Art department

Costume department

Make-up and prosthetics



General post-production staff

Special and visual effects


Not every person who worked on this adventure was credited. The absence of a credit for a position doesn't necessarily mean the job wasn't required. The information above is based solely on observations of the actual end credits of the episodes as broadcast, and does not relay information from IMDB or other sources.

References Edit

Culture Edit

Music Edit

Locations Edit

Businesses Edit

Technology Edit

Science Edit

Species Edit

Foods and beverages Edit

People Edit

Organisations Edit

  • Bill and her friends go to Redcliffe Lettings to find a new house to live in.
  • Redcliffe Lettings' phone number is 01174 960313.

The Doctor Edit

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


Story notes Edit

David Suchet and Mike Bartlett - The Aftershow - Doctor Who The Fan Show18:36

David Suchet and Mike Bartlett - The Aftershow - Doctor Who The Fan Show

This episode's Aftershow on Doctor Who: The Fan Show.

  • The read-through for Knock Knock took place on 18 July 2016, and filming took place in August.
  • David Suchet said in The Fan Show: The 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.
  • In an interview for Doctor Who Magazine #512, writer Mike Bartlett indicated that Harry was intended to be the grandson of Fourth Doctor companion Harry Sullivan, but the reference was cut. A possible remnant of this has Harry recognising the Doctor's name and calling him a "legend", despite the episode establishing that Bill is not yet closely acquainted with her new flatmates; another is the fact that Harry is partnered up with the Doctor for part of the episode. There is also a dialogue reference made to Harry's grandfather and his boyfriend stealing a piece of the Great Wall of China, however it is not clear whether this refers to Harry Sullivan or another grandparent.
  • "Weird People" by Little Mix is playing extra-diegetically in the scenes where Bill and her friends are looking for a new house.
  • Shireen refers to 11 Cardinal Road as "a freaky Scooby Doo house". The episode was partly filmed on location on the same property used for Wester Drumlins in TV: Blink - in which a character also referred to the place as "Scooby Doo's House".

Ratings Edit

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Filming locations Edit

Production errors Edit

If you'd like to talk about narrative problems with this story — like plot holes and things that seem to contradict other stories — please go to this episode's discontinuity discussion.

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Continuity Edit

Home video releases Edit

DVD releases Edit

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Blu-ray releases Edit

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Digital releases Edit

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External links Edit

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