Watch: The arrival of the Thirteenth Doctor
Peter Capaldi aka The 12th Doctor Who has vacated the TARDIS.
In the Christmas special, Twice Upon a Time, Peter Capaldi's Time Lord chose to regenerate after initially refusing. And after guiding the First Doctor (David Bradley) onto his first regeneration after the climactic events of The Tenth Planet.
After a powerful speech and monlogue urging above all to be kind, Peter Capaldi's Twelfth Doctor was gone, in a blast of regeneration energy.
Then, with a simple "Oh, brilliant" heralding the arrival of Jodie Whittaker's Thirteenth Time Lord, it was on to pastures anew.
Watch the Twelfth Doctor's farewell speech and the arrival of Jodie Whittaker as Doctor Who, including the new Doctor Who's first words below.
The Twelfth Doctor's monologue -
"Oh there it is. Silly old universe. The more I save it, the more it needs saving. It's a treadmill.
"Yes, Yes I know they'll get it all wrong without me. Well I suppose one more lifetime won't kill anyone. Well, except me.
"You wait a moment, Doctor. Let's get it right. I've got a few things to say to you. Basic stuff first. Never be cruel never be cowardly, and never ever ever eat pears.
"Remember, hate is always foolish and love is always wise. Always try to be nice but never fail to be kind, oh and you mustn't tell anyone your name - no-one would understand it anyway.
Except children, children can hear it, sometimes if their hearts are in the right place and the stars are too, children can hear your name - but nobody else, nobody else, ever.