Review of Kill the Moon
Warning: This review contains episode-specific spoilers and wild speculation about future episodes.
Here’s where my academic background betrays me.
I have (generally speaking) enjoyed Series Eight so much that I really wanted to like this one, too. But even before the problematic personal interactions surface late in the episode, I had checked out. The plethora of egregious scientific errors pulled me so far out of the narrative I may as well have been orbiting Earth right along with that egg the moon.
Doctor Who has always played fast and loose with the science in its stories, but science fiction (or even “science fantasy,” if you feel that description more accurately fits Who) storytelling doesn’t work if the writing isn’t self-consistent. You can say, for instance, that the sonic screwdriver can unlock anything except a deadlock seal, and your audience will go with it—as long as you don’t later use the sonic to unlock a deadlock seal. Similarly, if you’re going to set your story on Earth (and its moon), and have the plot hinge on something as well understood as gravity, you’d better not fuck with the basic laws of physics as we all know they work on Earth.
I could roll with it at first. So the moon’s got Earth-normal gravity now; somehow it’s gained mass. Fine. The Doctor even provides a few science-fictiony explanations that are narratively plausible: “gravity bombs, axis alignment systems, planet shellers…” But when you turn around and say it’s because the moon’s really an egg, and the fetus’s growth has added 1.3 billion tons to the moon’s mass—thus completely throwing out conservation of mass, one of the most basic laws of physics—I’m done.