William Hartnell and Patrick Troughton
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Missing Doctor Who episodes discovered

12 December 2011 Last updated at 11:00 GMT

Doctor Who fans are getting a fresh opportunity to travel back in time with the discovery of two missing episodes from the long-running BBC series.

The 1965 and 1967 episodes star William Hartnell and Patrick Troughton, the first two actors to play The Doctor.

They are among more than 100 instalments which were not retained by the BBC.