Depois de dizer adeus a Martha Jones no fim de Last of the Time Lords, o Décimo Doctor acidentalmente pilota sua TARDIS para o caminho da... TARDIS do Quinto Doctor! Enquanto o atual Doctor aprecia aspectos do Quinto, o Quinto Doctor se torna cada vez mais preocupado que as TARDISes combinadas ameacem rasgar um buraco no espaço e no tempo do tamanho da Bélgica!

Who is attacking a speeding bullet train on the edges of a distant galaxy? Why are seismologists going missing from 21st century Earth? Who is defacing some of history’s most iconic paintings? Why is a Dalek trying to make contact with the Doctor? And just what hold does the mesmeric Rasputin have over Tsar Nicholas in 1916 Russia? In her last adventure, The Thirteenth Doctor must fight for her very existence, against her deadliest enemies: the Daleks, the Cybermen and her arch-nemesis, the Master.