As of its air date, this is the best episode in season 8. It starts off with the monologue Capaldi gave in the teasers of whether or not anyone's ever truly alone or if we all have a hidden constant companion that's with us wherever we go before taking the TARDIS to various character's pasts. The episode is executed very well; the pacing is excellent and the writing is top notch. My only complaint about this was that it spent too much time focusing on Clara's relationship with Pink, a fellow teacher at her school. It's not one of those pointless relationships that are shoehorned for the sake of having romance- it actually plays a fairly important role in the plot, but it was pretty frustrating to segway from The Doctor's quest to find the apex hider for some romantic banter that quite honestly, no one really cares about.
It's a Moffat episode with his usual emotion and excellent dialogue, but without any of the gaping plot holes or extravagance that have become synonymous with his name (although the constant lens flare near the end was pretty annoying).
It's a Moffat episode with his usual emotion and excellent dialogue, but without any of the gaping plot holes or extravagance that have become synonymous with his name (although the constant lens flare near the end was pretty annoying).