Part 1 of this two part finale to the season is very, very much a ‘part one’ sort of story. As a single episode it is barely coherent and difficult to evaluate. The most pertinent observation is that there is a lot going on, including a fascinating side story set in 1950s Ireland about a foundling who grows up to join the Garda.
Like the over-wrought Lone Cyberman, the episode also has the appearance of chunks of other stories welded together. In particular there are elements from the Utopia/Sound of Drums/Last of the Time Lords triple that ended season 3 of nu-who.
I’m going to leave the review at that for the moment until next week and I’ve seen the whole thing.