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BBC to reveal a number of missing Doctor Who episodes
Dozens of early episodes starring William Hartnell and Patrick Troughton (pictured, left) are missing
A number of early episodes of Doctor Who, which were believed to have been permanently lost, have been returned to the BBC.
BBC Worldwide is expected to confirm the find at a press conference in London later this week.
It follows weeks of speculation that some lost episodes had been located.
A total of 106 episodes featuring the first two actors to play the Doctor, William Hartnell and Patrick Troughton, are currently missing.
The BBC destroyed many of the sci-fi drama's original transmission tapes in the 1960s and 1970s.
However, the majority of the episodes had been transferred on to film for foreign broadcasters. It is often these prints found in other countries that are the source of retrieved episodes.
The Tomb Of The Cybermen was recovered 20 years ago
In 1993, all four instalments of the Patrick Troughton adventure The Tomb of the Cybermen were discovered in Hong Kong.
The latest find comes as Doctor Who celebrates its 50th birthday. A special episode featuring the current Doctor Matt Smith and his predecessor David Tennant will be shown on the programme's anniversary on 23 November.
A raft of other programming to celebrate the long-running drama was also recently announced by the BBC.
Details of how fans will be able to watch the recovered episodes are also expected to be revealed later this week.