And so Doctor Who's fourth adventure kicks off with the first episode that we cannot actually see. But there's plenty to examine in terms of the large amount of filming done for this episode, the last minute changes to the script which give the story a unique flavour, and two of its actors who span from the top to the bottom of the guest guest list and who both had very different careers that coincided here, in Lime Grove Studio D, back in January 1964.

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