According to various sources on the internet, episode 3 was the final episode of the serial that David Whitaker contributed to. In fact, I’m rather curious how much of the final product is Whitaker’s and how much can be attributed to Malcolm Hulke, Trevor Ray, and Terrance Dicks. According to A Brief History of Time (Travel), Derrick Sherwin (the producer who commissioned Whitaker to write this story) wasn’t happy with the approach of Ambassadors. I haven’t yet, however, found any information of what the original approach was. Many of the changes that Hulke made(according to above sources) seem trivial: renaming characters, renaming the fake businesses on the side of a cargo truck, changing one character’s nationality. I would love to see a more detailed list of the changes. If anyone is aware of one, let me know.
As for the episode itself, things are growing quite grim. The body count in this one is high, and two thugs are dumped in a quarry. I’m still not quite sure what is happening, but it seems UNIT (an international organization) is at odds with the British military, which is trying to keep this entire incident as quiet as possible. The astronauts, if they truly are the astronauts that were sent in the original shuttle, seem to be infected with a type of radiation that is incredibly deadly, and seems to need more radiation to sustain itself.
This is a darker story than I expected. Even though I think the pace needs tightening, there is enough mystery and suspense to keep me interested.