When you watch Doctor Who Season 10 Episode 5 online, the Doctor assists Bill as she moves to a new home, which she is sharing with a number of other students from the university. The Doctor is suspicious, however, and suspects that there is more to this creaky old house than meets the eye. For one thing, the tree outside creaks, even though there is no wind blowing. And there's something really rather unsettling about The Caretaker, who doesn't even seem to have a name. So despite Bill's objections, the Doctor invites himself to stay the night. And it isn't long before things start getting alarming, with some of Bill's housemates disappearing into the house itself. What are the mysterious bugs that can pass through the wood of the house? And where is the Caretaker's daughter? There are more mysteries than rooms in this old house, it seems, and the Doctor and Bill must try to find the truth before the house consumes them, too. Who is the Caretaker, and what is his agenda? Find out what happens when you watch Doctor Who Season 10 Episode 5, "Knock Knock," online, right here at TV Fanatic!