The Sixth Doctor and Evelyn, having followed a weird transmission, arrives in London in 2003, but they quickly notice that the city appears strange and looks unusually dirty and dusty. Before they can properly investigate, the TARDIS suddenly flees in terror and leaves them behind. The Doctor is then suddenly stricken by a weird sense of deja vu, and realizes that he and Evelyn has landed in an alternate timeline. England, now known as the "English Empire", has become the central political power of the world, following the events "The Great Dalek War of 1903", and is ruled by the despotic President Rochester, who holds the sole surviving Dalek in the universe as a captive, and uses it as a part of his propaganda campaign of death.
As the Doctor and Evelyn try to restore the original timeline, they discover that they are being worshipped as heroes of the Dalek war, a fact which worries the Doctor, as he suddenly has faint and rather out-of-place memories of having fought in that war, and perhaps even more disturbingly, he can't recall if he ever managed to escape from it.
In a planned homage to this story, boxes from a chain called Jubilee Pizza were supposed to have been seen in the background in the television episode it inspired, "Dalek", but the scene was cut. The pizza chain finally appeared in the premiere episode of Torchwood, "Everything Changes".
Before the beginning of Part 1, a fake movie trailer for Daleks: The Ultimate Adventure plays, with the Doctor portrayed as a dashing hero, Evelyn is portrayed as a young, sultry companion, and the Daleks are heard doing some very un-Dalek like things (such as laughing evilly and shouting 'Scarper!' when the Doctor appears). The trailer is set within the parallel Earth featured in this story.