For the fourth time this season, we have a two-part episode. While I was disappointed with the last two multi-episode stories, this one is a return to form. When you stretch a story over multiple episodes, there has to be enough content to fill those episodes. While The Zygon Inversion was a bit light compared to The Zygon Invasion, it certainly made the whole hour-and-a-half feel like it was worth watching.
The Lowdown 