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.

Cast:Tom Baker, Lalla Ward, David Brierly, Christopher Neame, Daniel Hill, Denis Carey,

Genre:Science Fiction, Adventure, Animation,

country:United Kingdom,

Production:BBC, BBC Worldwide, BBC Studios,