The 637th episode of Doctor Who airs on BBC1. Patrick Troughton and Frazer Hines return as the second Doctor and Jamie, and the Sontarans appear for the first time since the Tom Baker era. Jacqueline Pearce (Blake’s 7) guest stars. This is Patrick Troughton’s final Doctor Who episode, and the last original series appearance of the Sontarans.
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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