Over the decades this show has evolved, it’s mythos is a patchwork built by generations of writers, actors and directors, each adding on to what came before. Things that we consider fundamental to Doctor Who now didn’t even exist back at the very beginning. Time Lords, telepathic circuits, even the sonic screwdriver didn’t come into being until well into Patrick Troughton’s run. What were, originally, one-off throwaway lines have now become universe shaking facts. To take a recent example, the basis for the Timeless Child reveal comes from one scene in a Tom Baker episode way back when. I can’t think of any other show that uses continuity to this extent and that brings to me the subject of today’s discussion.