"The Moonbase", by Kit Pedlar, is one of those shaky 1960s stories that is enjoyable in its quaint own way without being particularly dramatic or exciting. It represents a classic example of the "base under siege" format that would typify the later Troughton years and benefits by being produced before the format became too formulaic.
The Cybermen have had a makeover since their first appearance in The Tenth Planet and now appear much more impassive and menacing, complete with their new electronic, monotone voices.
The supporting characters avoid being completely generic by the introduction of a convincing Frenchman named Benoit (André Maranne) and one of those gruff, pragmatic salt-of-the Earth types in Captain Hobson (Patrick Barr). The rest of the supporting players blend into one another, but all do a decent job.
The episodes that survive in video, meanwhile, display imaginative production design given the budget available, and the model work is more convincing than some. The lunar surface is quite well-conveyed, too; it's not obvious where the set ends and the static backdrop begins. The sight of an army of Cybermen striding across the barren landscape is quite an iconic image, and I was glad to have the opportunity to see the final part of the story on the screen (they are available on the DVD set "Lost in Time"). On the audio recording, clear narration is provided by Frazer Hines.
With fair sound design and familiar music cues, "The Moonbase" is an unremarkable but solid entry into 1960s Doctor Who canon.