The 134th episode of Doctor Who airs on the BBC. This concludes the first story to feature the Cybermen, and is the first episode in the show’s history in which the Doctor regenerates. The new Doctor, Patrick Troughton, is glimpsed briefly at the end of the episode.
In perhaps the most painful example of episode wiping in the show’s history, this episode is now missing from the BBC’s archives, though the scene of the Doctor’s first regeneration has since been recovered.
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