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Events on Saturday 29 October 1966 1
1966Doctor Who introduces its first regenerationWilliam Hartnell hands the role to Patrick TroughtonIn the episode broadcast on 29 October 1966, the BBC series Doctor Who had its lead character transform into a new physical form for the first time, allowing William Hartnell's Doctor to be replaced by Patrick Troughton. The device let the show continue with new actors and became a defining feature of the series.