A 9 year old fan was worried about the Twelfth Doctor regenerating. Peter Capaldi sent him this.
Here’s my Doctor Who Unlocked Post for Twice Upon A Time featuring behind the scenes info, notes on continuity and more!
The Twelfth Doctor’s final words
The Twelfth Doctor (Peter Capaldi) regenerates into the Thirteenth Doctor (Jodie Whittaker)
The Twelfth Doctor becomes the Thirteenth Doctor in these final moments of the Doctor Who Christmas Special, Twice Upon a Time.