Ian Frost

The Doctor and his companions Steven Taylor and Dodo Chaplet arrive some ten million years into the future, on board a generation starship which is carrying the last of humanity away from an Earth that is about to fall into the Sun. However, the cold that Dodo has could prove devastating to these future humans and their servants, the Monoids.

Now a respected teacher of temporal observers, Dominick has not visited the past for several years. He is content with his lot, resigned to the idea that he will never again see Jane, the lover he left in 1980, or their son. Then his boss gives him a new mission: to find out what has become of one of Dominick's students, Pyrus Bonnington, who has gone missing in 1982.

In the 26th century, the Doctor and Jo uncover a plot by the Master to provoke an interplanetary war between Earth and Draconia.