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Next time on an all-new Doctor Who, Bill is moving in with some friends and they’ve found the perfect house – so what if it’s strangely cheap to rent, and the landlord is a little creepy? The wind blows, the floorboards creak, and the Doctor thinks something is very wrong. What lurks in the strange tower at the heart of the building – and why can’t they find any way to enter it?

Find out next Saturday when ‘Knock Knock’ premieres on BBC One, BBC America, and ABC TV.