Doctor Who (2005– )
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Knock Knock 

Bill is moving in with some friends and they've found the perfect house rented by the landlord. The wind blows, the floorboards creak and the Doctor thinks something is very wrong.


Bill Anderson


Mike Bartlett

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


As Bill and some friends are searching for a house to rent and not pleased by the houses they've visited; a mysterious landlord appears with this very cheap and enormous house which they take the offer and move to the new house. But all its not as it seems as the wood creaks, the house traps them, Bill and The Doctor are separated from each other and some bizarre and macabre force is taking the life of each one of the people of the house. Is this cause of the mysterious landlord? Has this happened before? Can Bill and her friends survive the evilness of the house? Written by Jose Benavides

Plot Summary | Add Synopsis


TV-PG | See all certifications »

Parents Guide:

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Release Date:

6 May 2017 (USA) See more »

Company Credits

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Technical Specs


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Did You Know?


Harry (Colin Ryan) was originally intended to be the grandson of Doctor Who (1963) companion Harry Sullivan (Ian Marter), but this was cut out because the writers thought that people "might not remember one companion from 40-odd years ago." See more »


When Paul is helping Bill carry boxes to her room, he is shown holding a typical packing box, which has the usual "STACK THIS WAY UP" notice, however, the writing and arrows are pointing to the side of the box, rather than the top (where the opening/closing flaps are) or bottom. See more »


Paul: Bill, if you get scared in the night, you know where I am, yeah?
Bill: What?
Paul: Just if you need any er, of my help, or my whatever, you know?
Bill: Yeah. Er, I get that you're into me, but, um, sorry, you're not my type. It's just, er I tend to go for girls, usually, so
Paul: Oh. Oh, right! I was never in with a chance. Awesome!
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References Scooby Doo, Where Are You! (1969) See more »


Doctor Who Theme
Written by Ron Grainer
Performed by BBC National Orchestra of Wales
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User Reviews

Interesting experience
7 May 2017 | by simonkitesSee all my reviews

"Knock Knock" was interesting experience.

I very liked the atmosphere of this episode. It was dark episode, with small pieces of humor. Whole episode i was very invested, and i had no idea where plot it's going to. I very liked molar of the story. Moral about, that we may loose some one that we love, and we ready to do horrible things to save them.

But many thing was quite clichéd. Basically, this is "hunted mansion" story. Ghosts, thunders, creepy noises and creepy landlord (playd by amazing Hercule Poirot). Whole episode i had a "Scoody Doo" feeling, and only one thing was missing is the dog himself(replaced by "Doctor Who" himself). Yep, it is funny.

But major problem with episode is the ending. It was dark, and disappointing in the same time. NewWho simply does not have enough balls, to do something dark these day compare OldWho did in Tom Baker era. I want to see some consequences after story, or else story it self feels meaningless.

In the conclusion, this is definitely not the "Blink". More like a weaker version of "Empty Child". Still, i liked the story. "Not amazing, but great".

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