Santa Claus becomes a character of surprising dramatic potential when you place him under the Doctor’s perspective. No longer is he a face beaming ruddily out at you from the insincere aisles of a department store. On Doctor Who he becomes a seat of judgment, qualified to tally the sins of a being that few in the universe could conceptualize, let alone consider objectively. He knows who’s been naughty and nice, so where does the Doctor stand in that estimation? (Which Doctor are we talking about? When?) Beyond the ability to truly put our Time Lord on trial, Santa Claus also represents an equal to the Doctor. Both are creatures of myth who defy the laws of their universe with regularity and as such they are both uniquely able to discuss the burdens of their loftiness with each other.
Doctor Who’s 2014 Christmas episode “Last Christmas” does not grapple with these facets of the Doctor directly. How could it? We are only human, as is Clara, and we can only imagine what it is like to be someone who can shift the very winds of fate itself. We can only create boundary-defying television shows like Doctor Who and depict the Doctor and Santa Claus as we think they would act and the only tool we have to shape this televised reality is our belief. These stories are only as real as we want them to be.