Next Time: Knock Knock

TV Trailer:

Next time, it’s Knock Knock, the fourth episode of Series 10:

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?

It premieres Saturday 6 May on BBC One, at 7.20pm.