I’ve lost count of how many times there has been a Doctor Who episode set on a space station or inside of a ship in peril. The set-up is always the same, The Doctor and companion(s) arrive, are almost immediately separated from the TARDIS, realize they are in danger and are met with suspicion by the survivors. There are often dark corridors and some running involved, and ultimately a puzzle is solved and a sacrifice is made.
So far this has been the most consistent run of episodes since the reboot. Capaldi maintains the grumpiness and distance of his version of the Doctor, yet he has become a more endearing character in these flaws. Bill has done a great deal to balance him out and though I am becoming resolved to his departure I really hope she doesn’t leave at the end of the season along with him.
The easy chemistry between Capaldi and Mackie makes me wish she had been around longer in the series. When she introduces the Doctor as her Granddad in this episode, it is just too funny, especially in light of how strongly he objects to the designation. That the TARDIS is employed as a moving van is also a nice excuse for a chuckle.