BBCFor those who remember, it's almost impossible to wrap your mind around the fact that Matt Smith’s epic second season of Doctor Who was airing a decade and a half ago. But back in June 2011, the second season of Smith’s tenure, and then-showrunner Steven Moffat’s twistiest season up until that point, was rushing toward a mid-season finale, a fairly new concept at the time. This was a moment where Doctor Who seemed to be playing a long game, a…