5.2 million people in the UK watched Into the Dalek a share of 24.7% of the total TV audience, according to unofficial overnight viewing figures.
Doctor Who was the second-highest rated programme of the night, which was won by the return of the talent show The X Factor on ITV, which had 9.3 million watching. Against the Doctor, The Chase: Celebrity Special had an audience of 4.2 million.
Episode two of the new series of Doctor Who did not suffer any loss of viewers during the clash with The X Factor, with ratings stable throughout the episode. Around 2 million viewers switched to ITV as Doctor Who finished. The second-highest rated programme on BBC One was Casualty with 3.9 million watching.
Doctor Who is currently 21st for the week. Final figures will be released next week.
Saturday 30th August
17:30: Pointless Celebrities - 3.0m (21.8%)
18:15: Tumble - 2.7m (16.7%)
19:30: Doctor Who - 5.2m (24.7%)
20:15: Break the Safe - 2.8m (12.8%)
21:10: Casualty - 3.9m (18.4%)
22:15: Match of the Day - 3.6m (25.7%)
20:15: Ancient Egypt: Life and Death in the Valley of the Kings - 1.0m (4.6%)
21:15: Andrew Marr's Great Scots: The Writers Who Shaped a Nation - 0.6m (2.6%)
19:00: The Chase: Celebrity Special - 4.2m (22.2%)
20:00: The X Factor - 9.3m (42.3%)
21:25: Through the Keyhole - 3.9m (19.6%)
21:25: Celebrity Big Brother - 1.2m (6.0%)