I have grown a bit leery of the recent two-part stories that Doctor Who has offered us. Crackling starts have been leading up to fine cliff-hangers, but second episodes that have not lived up to the promise.
Even so, this episode, in which the Doctor and Clara jump ahead to an undersea base, only to find that the crew is being assaulted by ghosts, is a fine start. Toby Whithouse, the episode's writer, has offered the revived series a solid episode or two every year, and with the ending of his own series, BEING HUMAN, bids fair to make this the first fully satisfactory two-parter in some time. The endless series of quips and cranks that the Doctor has exhibited, seemingly in an effort to pad the stories, has been cut down to a couple of amusing bits. Instead we get to see the episode's extended cast in some detail.
Some kind words should be offered to the make-up department who have hit on a simple yet telling way to mark the ghosts with endless black eyes. Instead of admiring the special effects, we get to pay attention to the story. I am hopeful that the second episode will live up to the first.