David Bradley’s first line as the Doctor in this footage—which also has original First Doctor William Hartnell’s performance from decades ago merged into his—are his lines to Cybermen from “The Tenth Planet,” the story in which he regenerated, which tells us exactly where in the timeline the Twelfth Doctor is meeting his first incarnation.


All of this was a goodbye to Moffat and Peter Capaldi, also in his last Hall H appearance as the current doctor, and even Mackie, who confirmed that this will be Bill’s last outing.