Gallifrey is in a state of crisis, facing destruction at the hands of an overwhelming enemy. And the Doctor is involved in three different incarnations - each caught up in a deadly adventure, scattered across time and space.

The web of time is threatened - and someone wants the Doctor dead. The three incarnations of the Doctor must join together to set time back on the right track - but in doing so, will they unleash a still greater threat?

The Seventh Doctor is in episode one of this four-part story; the Fifth Doctor is in episode two; the Sixth Doctor is in episode three; and all three Doctors are in the final episode.

Written and directed by Nicholas Briggs.