England, the near future. Something inhumanly strong and resilient is raiding scientific establishments across the country. Can the new Doctor help UNIT? And what are the staff of the secret government think tank working on in their spare time?

England, the near future. Sarah Jane Smith meets a gigantic robot, and the Doctor finds himself struggling for his life.

England, the near future. The Doctor attempts to thwart the plans of a group of unscrupulous scientists who threaten the Earth's destruction, and plan to use their giant robot to obtain the power they need to blackmail the world into obeying them.

England, the near future. The Robot grows to gigantic proportions and goes on a rampage. The Doctor finds the solution in a test tube.

Deep space, the distant future: following Earth's devastation by solar flares, the survivors of mankind are in cryogenic suspension aboard the Nerva Beacon space station. The Doctor, Sarah and Harry arrive on board to find the station suffering from mysterious damage and some manner of creature at large…

Deep space, the distant future: following Earth's devastation by solar flares, the survivors of mankind are in cryogenic suspension aboard the Nerva Beacon space station. The Doctor, Sarah and Harry arrive on board and are greeted with suspicion by the awakening survivors… just as the menace of the insectoid Wirrn becomes apparent.

Deep space, the distant future: following Earth's devastation by solar flares, the survivors of mankind are in cryogenic suspension aboard the Nerva Beacon space station. The Doctor, Sarah and Harry arrive on board just as the menace of the insectoid Wirrn becomes apparent...

Deep space, the distant future: following Earth's devastation by solar flares, the survivors of mankind are in cryogenic suspension aboard the Nerva Beacon space station. The Doctor, Sarah and Harry arrive on board just as the menace of the insectoid Wirrn becomes apparent...

Earth, the distant future. Beaming down from the Nerva Beacon, the Doctor and his friends discover Earth is habitable once more. Unfortunately a robot is capturing a group of human soldiers on behalf of its mysterious alien master...

Earth, the distant future. Beaming down from the Nerva Beacon, the Doctor and his friends discover Earth is habitable once more. Unfortunately a Sontaran officer is conducting tests on a group of human colonists to determine their ability to withstand a full-scale invasion...

The planet Skaro, the distant past. The Time Lords divert the Doctor, Sarah and Harry to this war-torn world, and give the Doctor a mission: the evil of the Daleks is about to be born here, and the Doctor is to try to ensure they evolve into less lethally aggressive beings - or, failing that, to avert their creation altogether. But has even the Doctor the right to commit genocide?

The planet Skaro, the distant past. The Time Lords divert the Doctor, Sarah and Harry to this war-torn world, and give the Doctor a mission: the evil of the Daleks is about to be born here, and the Doctor is to try to ensure they evolve into less lethally aggressive beings - or, failing that, to avert their creation altogether. But has even the Doctor the right to commit genocide?

The planet Skaro, the distant past. The Time Lords divert the Doctor, Sarah and Harry to this war-torn world, and give the Doctor a mission: the evil of the Daleks is about to be born here, and the Doctor is to try to ensure they evolve into less lethally aggressive beings - or, failing that, to avert their creation altogether. But has even the Doctor the right to commit genocide?

The planet Skaro, the distant past. The Time Lords divert the Doctor, Sarah and Harry to this war-torn world, and give the Doctor a mission: the evil of the Daleks is about to be born here, and the Doctor is to try to ensure they evolve into less lethally aggressive beings - or, failing that, to avert their creation altogether. But has even the Doctor the right to commit genocide?

The planet Skaro, the distant past. The Time Lords divert the Doctor, Sarah and Harry to this war-torn world, and give the Doctor a mission: the evil of the Daleks is about to be born here, and the Doctor is to try to ensure they evolve into less lethally aggressive beings - or, failing that, to avert their creation altogether. But has even the Doctor the right to commit genocide?

The planet Skaro, the distant past. The Time Lords divert the Doctor, Sarah and Harry to this war-torn world, and give the Doctor a mission: the evil of the Daleks is about to be born here, and the Doctor is to try to ensure they evolve into less lethally aggressive beings - or, failing that, to avert their creation altogether. But has even the Doctor the right to commit genocide?

The orbit of Jupiter, the 25th century. Arriving back on the Nerva Beacon much earlier in history, the Doctor and his friends discover the satellite beset by space plague while its crew struggles to keep space traffic away from Voga, the newest moon of Jupiter. But what is the connection between Voga, the plague, and some old enemies of the Doctor?

The orbit of Jupiter, the 25th century. Sarah Jane falls victim to the same plague as the other Nerva crewmen. With time running out, the Doctor transmats her and Harry down to the planet Voga, unaware that a mysterious ship is approaching the beacon.

The orbit of Jupiter, the 25th century. The Doctor and the Nerva Beacon crew are captured by the Cybermen, who plan to use them in their plan to destroy Voga, the Planet of Gold. The Cybermen promises them a slim chance of survival, but have no intention of keeping their words.

The Doctor manages to thwart the Cybermen's plan to destroy Voga by delivering Cyberbombs to the heart of the planetoid. But the Cyberleader has another plan, and the Doctor must convince the Vogans to give him enough time to rescue Sarah Jane before they launch their rocket.