The 501st episode of Doctor Who airs on BBC1, continuing the Key To Time storyline. John Woodvine (Knights Of God) and Lalla Ward guest star. Valentine Dyall makes his first appearance as the Black Guardian. This is the final six-part Doctor Who story to be broadcast.
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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