William Hartnell as the first Doctor Who, with the Celestial Toymaker.
Early episodes of Doctor Who which were believed to have been lost have been returned to the BBC, the corporation has said.
BBC Worldwide is expected to confirm the find at a press screening in London this week, according to an online BBC news report.
It said 106 episodes featuring the first two actors to play the Doctor, William Hartnell and Patrick Troughton, are missing.
Peter Capaldi revealed as Doctor Who's new Time Lord
Peter Capaldi as Malcolm and Chris Addison as Toby in a scene from In The Loop.
Last month, it was confirmed that the first four episodes of Doctor Who - from 1963 - will be screened on BBC as part of the show's 50th anniversary celebrations.
The newly restored shows, starring Hartnell as the first incarnation of the Doctor, will be shown on BBC in the UK.
Tens of millions of people around the world will watch the global premiere of The Day Of The Doctor, with Matt Smith and David Tennant.
Smith, whose stint as the Time Lord ends this year when he is replaced by Peter Capaldi, said: "The Day Of The Doctor is nearly here. Hope you all enjoy. There's lots more coming your way, as the countdown to the 50th begins now."
♦Read more on Doctor Who's 50th anniversary in The Guide in Fairfax newspapers on the week of November 14.