The first special starring David Tennant as the Fourteenth Doctor, The Star Beast, had an official 7-day rating of 7.61 million viewers in the UK.
The rating is the highest figure for Doctor Who since The Tsuranga Conundrum in 2018.
Doctor Who was the 10th most-watched programme on British Television for the week, behind seven episodes of I'm a Celebrity Get Me Out of Here and two of Strictly Come Dancing.
The official rating includes those who recorded the programme and watched it within a week.
Globally the episode is the 61st watched movie on Disney+. It has been most successful in Australia, New Zealand and Turkey.
The Appreciation Index, a measure of how much the audience enjoyed the episode, was 84.
The second episode, Wild Blue Yonder, had an overnight rating of 4.83 million, third for Saturday behind the dancing and grub-eating reality shows. 7-day figures will be released next week. Its Appreciation Index was 83.