Let's reflect for a moment on just how insane this story is: three different incarnations of the same character working together for a single story. Think of how crazy it would be to watch a Bond movie, except with Sean Connery, Roger Moore, and Timothy Dalton all playing different Bonds working together. Or a Sherlock Holmes movie with Basil Rathbone, Jeremy Brett, and Robert Downey Jr. Or Batman with Adam West, Michael Keaton, and Christian Bale. It's a crazy notion of metafiction, forcing together three things that are the same, and yet totally incompatible. It's fun to mess around with that sort of thing, but the fact is that it just doesn't work on a literal level. It's just not possible within those stories for multiple ones to exist together. Plus, the clash of styles would be in many ways incompatible.
So it's worth noting just how crazy this show is that putting three Doctors together in the same story not only works, but seems absolutely natural and normal.
