Doctor Who: World Enough And Time had an audience of 3.37 million viewers, a share of 22% of the total TV audience, according to unofficial overnight figures.
The day as a whole suffered from very low ratings with the highest rated show, Casualty, only getting 4 million watching. Mrs Brown's Boys had 3.38 million while Pitch Battle had just below 2 million.
Over on ITV the highest rated show was the children's version of The Voice which had 3.80 million watching.
Official figures will be released next week.