Episode list

Sometimes the TARDIS takes the Doctor to where he needs to go... Answering a distress call from the out-world of Triketha, the Doctor and Constance Clarke discover human colonists battling against an onslaught of giant, malevolent insects. The insects' sting induces a coma, and it is only a matter of time before all the colonists succumb. The Doctor is curious as to the origins of the insects, which appeared from nowhere, and offers his assistance to the colony's governor. But is this the Doctor's first visit to Triketha, or has he been here before? The Doctor must confront a past that he has no memory of and take responsibility for the consequences of his actions.

The TARDIS brings the Doctor and Turlough to a high-tech scientific installation on the planet Testament in the distant future. The human race have become intergalactic buccaneers, thanks to their ability to generate vast amounts of power for long-distance travel. Testament is the source of that power - and the Doctor has never quite understood how it works. But experiments are underway on Testament - experiments with potentially explosive and devastating consequences. And even the Doctor may be too late to stop it. With politicians and bureaucrats getting in the way, the race is on. Not to stop a disaster - but to save as many people as possible.

The Universe is in a state of crisis, facing destruction from the results of a strange spatio-temporal event. And the Doctor is involved in three different incarnations - each caught up in a deadly adventure, scattered across time and space. The whole of creation is threatened - and someone is hunting the Doctor. The three incarnations of the Doctor must join together to confront their implacable pursuer - but in doing so will they unleash a still greater threat?