The Aztecs 4 - The Day of Darkness

And now Autloc sees them as being false. And the emotion you feel from him is disappointment. He's been let down and you really feel it. This is the power of three dimensional characters, ones who are not always just good or bad, and this is the giant mirror between Terry Nation and John Lucarotti.

In Lucarottis work the events feel like they happen because of the characters but with Nation the characters feel like they merely exist to service the plot or provide some exposition.

The Doctors fiancee helps them escape, but her becoming his fiancee and then choosing to help him above her own needs in no way feels forced or simply a narrative tool.

When the TARDIS team eventually escape you get the feeling that the story continues on. That's good writing.

So... Pity it's the Sensorites next, eh?