The Doctor, Princess and Dodo have found their way back to modern day Earth, and just in time for the new super computer, WOTAN, to be turned on. But when this problem-solving computer decides it knows best, it will attempt to takeover the world with its War Machines. The Doctor and Princess will need help this time. Luckily, they're about to make some new friends...

The time travellers and their new companion have landed on the Northumbrian coast in the 11th century. However, when the Doctor and Princess' noses start to itch, they decide to venture out on their own. Furthermore, there are anachronisms to be found, leading back to a nearby monastery. The two are about to find more trouble than they could possibly imagine, in one meddling monk.

The Daleks have found the Doctor and Princess, and they have no intention of letting them go. Now armed with time travel, a group of Daleks will pursue the time travellers across time and space, until they can exterminate them once and for all. With nowhere to run that the Daleks can't follow, the time travellers must face them once more, and for some, it'll be the last time.

The time travellers have glimpsed their own future. After drifting forwards in time, they find themselves on display inside a museum. Now, they have a chance to avoid this future, but they must be careful. Any and every decision risks bringing them closer to their fate. Can they make the right choices, or are they doomed to forever be on display?

Italy, 64AD. The time travellers are on holiday, but Vicki wants an adventure. The Doctor and Princess decide to take her to Rome, but on the way, the Doctor gets mistaken for a famous musician. The three quickly find themselves caught up in a web of lies and one wrong move will mean death. What's worst, history is looming, and it's about to get very hot in Rome.

The Doctor and Princess have a void in their lives. Ian and Barbara are concerned. But when they land on Dido, they find two survivors of a crashed spaceship in need of rescue. A young woman named Vicki is about to get the offer of a life time, and the Doctor and Princess will do whatever it takes to protect their new friends.

Landing 200 years in the future, the time travellers discover the Earth has been taken over by the Daleks. But their villainy doesn't stop there. They're planning something, and with the time travellers cut off from one another, can they defeat them a second time? And with Susan growing up, the time nears for her to forge her own path. Is it time to say goodbye?