Knock Knock
Series 10 Episode 4
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?
Series 10: Part 1 DVD & Blu-ray
Doctor Who - Series 10: Part 1
Released 29th May 2017