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.

Where the Fourth Doctor left off, the Eighth Doctor comes to finish the job. With Romana and K9 by his side, they have to stop the evil Skagra. A remounted version of the abandoned Fourth Doctor serial, rewritten to feature the Eighth Doctor and fit in with the Big Finish audio drama continuity.

With the introduction of the Master, the Doctor now had his very own Moriarty, who would be the dark figure behind every story in Season 8, and many more beyond that. This documentary discusses the enduring appeal of the character.

In this animated adventure, The Doctor and Martha Jones trek through space and time in a race against the galaxy's greatest despot, Balthazar, to follow a complex trail of clues to discover the location of the legendary lost spaceship, the Infinite, which, according to myth, can grant anybody their heart's desire.

The tricks of putting together a television drama show 'as live' are discussed by vision mixer Clive Doig.

The tricks of putting together a television drama show 'as live' are discussed by vision mixer Clive Doig.

An animated adventure following the Seventh Doctor as he attempts to stop General Tannis' plans for conquest of the universe.

An animated adventure following the Seventh Doctor as he attempts to stop General Tannis' plans for conquest of the universe.

The Doctor and his companion Evelyn investigate a series of mysterious disappearances on the planet Chronos and once again encounter the dangerous Cybermen.

The Doctor and his companion Evelyn investigate a series of mysterious disappearances on the planet Chronos and once again encounter the dangerous Cybermen.