My review of the previous episode: Extremis.
[Sorry for the lateness: spent the last two weeks settling into my internship in Washington D.C. - in related news, keep an eye out for my writing at The Weekly Standard.]
If anyone was wondering which part of this episode Steven Moffat wrote, it should be pretty obvious when Peter Capaldi starts monologuing self-seriously about death. It's pure Heaven Sent. There's a kind of Moffaty gimmick at the center of The Pyramid at the End of the World, too: the concept of all-knowing aliens who can pinpoint world disasters and prevent them. On first viewing, I had rather a hard time coping with the idea of a benevolent invasion, but the more I think about it, the more I like it.