The Doctor visits his old Time Lord friend Chronotis in Cambridge, 1979. But the ruthless Skagra has also arrived to retrieve a book that will help unlock one of the Time Lords' greatest secrets: what is Shada? Filming for this story was never finished, and in this version the unfilmed material is completed via animation.

Doctor Who: Shada

As part of the sixtieth anniversary celebrations of Doctor Who, David Tennant time-travels back through the BBC archives to tell the story of the Doctor’s classic era.