The latest - short - instalment of the BBC's scifi drama will air as part of charity fundraiser Children in Need this week, with Scotland's David Tennant continuing to play the 14th Doctor after taking over from Jodie Whittaker after a suprise twist.
He's returning to the role he played to great acclaim from 2005–2010, as the 10th Doctor, but will soon make way for his fellow countryman Ncuti Gatwa.
The Sex Education star's first episode proper is expected to be screened over the festive season, when he will become the latest Scot to play a part in the journeys of the Tardis through space and time.
Here are some of the most important, since the first epidode was broadcast in 1963.
The Sex Education star's first episode proper is expected to be screened over the festive season, when he will become the latest Scot to play a part in the journeys of the Tardis through space and time.