When a sinister landlord shows Bill and her friends the perfect houseshare, they have no idea what lies ahead
Video Extras from This Episode
Extra Scene: 'One Hope, One Desire'
David Suchet's character explains why he's done what he has to protect his 'daughter.'
Pavel's Hairy Situation
Go behind the scenes — and the wall! — with Pearl's housemate.
David Suchet Finds Himself in Happy Company
The legendary actor shares his 'Doctor Who' experience.
Closer Look: The Scooby Gang and the Haunted House
Steven Moffat and Pearl Mackie give their unique insight into 'Knock Knock.'
Sneak Peek: This Old House
"Knock Knock"... who's there?!
Sneak Peek: "Knock Knock"
Bill and one of her roommates are given quite a fright.
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