Doctor Who: Under the Lake finished with an official rating of 5.63 million viewers.
The rating issued by the Broadcasters' Audience Research Board, or BARB, includes all those who watched the programme within one week of transmission. It does not include those watching online via iPlayer
The rating makes Doctor Who the 22nd most watched programme for the week on all UK television. It was the 10th most watched programme on BBC Television.
Doctor Who ended higher than Casualty, which beat it in the initial overnight figures, and was the third most watched show on Saturday Night. The Great British Bake Off topped the chart with a massive 12.65 million watching. The most popular Saturday night show was Strictly Come Dancing with 9.27 million viewers.