Harriet's insistence, the Doctor helps Mickey to hack into the controls of a Royal Navy submarine and fire a missile at 10 Downing Street, even though the Doctor is unsure whether they will survive. The Slitheen are caught in the explosion when the missile hits but the Doctor, Rose, and Harriet all survive. With the Prime Minister dead, the Doctor suggests that Harriet could become Prime Minister. The Doctor gives Mickey a CD to upload to the internet that will remove all mentions of the Doctor from the web. He also privately offers Mickey the chance to travel with him, but Mickey admits that he is too scared to handle it. He asks the Doctor not to tell Rose about his concerns. Rose arrives with a full backpack and asks the Doctor if Mickey can come along, and the Doctor covers for him. Production According to Russell T Davies (among others), this episode was called "Aliens of London, Part Two" until the last minute, when the name was changed to "World War 3", soon amended to "World War Three". The Telos Publishing Ltd. book Back to the Vortex cites "10 Downing Street" as another working title. This decision has proved to be a precedent, as in the original series all multi-episode stories shared a title from "The Savages" onwards. All multi-episode stories in the new series have continued to have individual titles except "The End of Time" and "Spyfall". Cast notes Lachele Carl reappears as the American reporter seen in "Aliens of London". She is later seen in "The Christmas Invasion", "The Sound of Drums", "The Poison Sky", "Turn Left", "The Stolen Earth" and the Sarah Jane Adventures story Revenge of the Slitheen. In "Turn Left," it is revealed that her name is Trinity Wells. She also appeared in the spin-off Torchwood, in the five-episode serial Children of Earth. Broadcast and reception "World War Three" received a final rating of 7.98 million viewers in the United Kingdom. The episode received an Audience Appreciation Index score of 81. Like the first part of the story, "World War Three" has received generally mixed reviews. Arnold T Blumburg of Now Playing gave the episode a grade of C+, finding it slightly better than "Aliens of London" because it minimized the "juvenile" humour associated with the Slitheen and had good performances by the actors portraying them, though some of the effects were lacking. He