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Why do floorboards creak? When a sinister landlord shows Bill and her friends the perfect houseshare, they have no idea what lies ahead... knock knock, who's there?
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50 minutes
Signed Audio described
See all episodes from Doctor Who (2005–2022)
If you're house-hunting look out for this peculiar property owner!
Find out more about the mysterious individual hiding in the tower.
Open the door on the Knock Knock Fact File.
Quiz yourself with these ten teasers.
Duration: 02:01
Duration: 00:56
Duration: 01:23
Duration: 00:54
Timings (where shown) are from the start of the programme in hours and minutes
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