Not a bad little story. I can see why Peter Purves didn't like it; he spends half the story "pretending to be asleep". I do find the old sci fi way of explanations something of a novelty - the planet will explode dead on dawn but there's no explanation whatsoever to say why - why dawn on their side of the planet? What's causing it? Why is it so precise you can boil an egg by it??
A good stab at racism, something not seen that often in early Who unless it has the word 'exterminate' attached to it.
I have to say, episode 3 'Airlock' is actually pretty good. I look forward to seeing it when it gets released.
The Myth Makers next.