The Twelfth Doctor (Peter Capaldi) and the First Doctor (David Bradley) Companion: Bill Potts (Pearl Mackie)
The episode contrasts the "modern" Doctor’s sensibilities with the more old-fashioned (and often socially outdated) views of the First Doctor. Doctor Who 10x13
Although the "real" Bill moved on in the previous episode, her memories return here as a gift from The Testimony, providing the Twelfth Doctor with closure. The Twelfth Doctor (Peter Capaldi) and the First