Starring: Colin Baker, Sylvester McCoy, Maggie Stables

Unfinished business. A traveller in time returns to correct the mistakes of the past and faces a danger that could rob him of his future. Unless his future intervenes. And in the shadows stands Nimrod. Waiting...

Starring: David Warner, Nicholas Courtney, David Tennant

What if... the Doctor had not been UNIT's scientific advisor? 1997. A lone exile arrives on Earth, years later than planned.The Doctor finds a world on the brink of terror. A world that has lived without him for years. A world frighteningly like our own.

What if... the Doctor had not been UNIT's scientific advisor? 1997. A lone exile arrives on Earth, years later than planned.The Doctor finds a world on the brink of terror. A world that has lived without him for years. A world frighteningly like our own.