As with the rest of this series, this finale is more character focused. The core focus of this episode is the contrasting philosophies of the Doctor and Clara against Me's (similarly to the contrasting philosophies of Davros and the Doctor seen in episode 1/2). This episode not only understands the Doctor's psyche but completely dismantles it showing exactly how he could break every rule he ever lived by. This is not a world ending threat like most finales, this is a story of how immortality can drive someone to deconstruct his own morality. Of course Rachel Talalay's direction is gorgeous as always and Moffat writes brilliantly. I just wish Clara had died. Other than that this episode is thoughtful, unique and rich with meaning. Possibly my second favourite finale ever?