I don't think that there is any single episode of anything that better encapsulates the spirit of BBC sci-fi than this one. The cast run down more corridors than the Doctor Who lot could even dream of, and the scenery wobbles all over the place. Surprisingly little happens, as so much is taken up with the corridor-running (and quite a remarkable amount of ladder-climbing). And yet this is a very good episode. It could use some tightening, perhaps. A few less corridors? A little less time spent on ladders? The story itself is very effective, though. Most of that is down to the ending.
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