The First Doctor regenerates

Tags: First Doctor, Polly, Ben Jackson, Cybermen

The Tenth Planet, episode 4
29 October 1966

While fighting the Cybermen, the Doctor has appeared increasingly old and frail, telling Polly that his “old body” is “wearing a bit thin”. With the threat from Mondas foiled, the Doctor demands they return to the TARDIS without saying goodbye. Inside, the controls operate of their own accord and the central column begins to rise and fall. As the TARDIS engines roar, the Doctor collapses…

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