The 51st episode of Doctor Who airs on the BBC. This is part six of the story now collectively known as The Dalek Invasion Of Earth, and marks the first change in the regular cast; Susan (Carole Ann Ford) departs the TARDIS at the end of this episode.
This timeline entry leads to an entry covering this entire Doctor Who serial; there are plans to write new episodic entries in the future. You can support this effort!
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