More than 10 million people tuned in to see the special 50th anniversary episode of Doctor Who in the UK, according to overnight viewing figures.
At its peak, the show was watched by 10.61 million viewers, with an average of 10.2 million across the 75-minute running time.
It comfortably beat X Factor on ITV, which was seen by 7.7 million people.
But Strictly Come Dancing was Saturday night's most popular show, peaking at 11.7 million viewers (10.6m average).
The Day of the Doctor was broadcast in 94 countries at the same time as it aired on BBC One on Saturday night - earning it a Guinness World Record as "the world's largest ever simulcast of a TV drama".
Featuring three Doctors - Matt Smith, David Tennant and John Hurt - it delved deep into the character's psyche over 75 minutes.
Amid the special effects and multiple time zones, critics were particularly impressed with the interplay between the actors.
Speaking immediately after the broadcast, star Matt Smith said: "I think what's really clever about it is that what he [Moffat] has managed to do is change the mythology of the character - which, after 50 years, is an achievement."
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