Official figures released by the Broadcasters’ Audience Research Board or BARB, give Doctor Who - Knock Knock an official rating of 5.73 million viewers.
The rating includes all those who recorded the programme and watched it within 7 days.
Doctor Who is the 21st most watched programme for the week, and 7th most watched on BBC One
Top for the week was Britain's Got Talent on ITV with 11.51 million watching. The main soaps again did well, with Coronation Street dominating the top of the chart. Other drama's with high numbers included Little Boy Blue with 7.11 million and The Durrells with 5.81 million. Doctor Who just edged ahead of the ITV detective series Grantchester, which had 5.71 million viewers.