For the Pete's World individual, see Harriet Jones from another universe.
Harriet Jones was a British politician in the early 21st Century who served from 2006 till 2008 as Prime Minister of the United Kingdom.
Jones helped the Ninth Doctor fight the schemes of the alien family known as the Slitheen. (DW: Aliens of London/World War III) Later, as Prime Minister, she and the Tenth Doctor faced the Sycorax.(DW: The Christmas Invasion)
Jones was a modest and intelligent middle-aged woman who had served her community faithfully for years without any real ambition beyond that. However, she was able to adapt quickly to the reality of the Slitheen threat, and took to the role of leadership easily, proceeding to reassure the public at the end that the crisis was over.
Jones always introduced herself by flashing her identity card and saying, "Harriet Jones, MP, Flydale North." She explained that this was because her constituency is a "tiny little place" and people would not know about it. Later, as Prime Minister, she continued to flash her card and say, "Harriet Jones, Prime Minister," to which people (including the Sycorax leader and a trio of Daleks) would invariably respond that they knew who she was. She later modified her introduction to say "Harriet Jones, Former Prime Minister".
Biography
Harriet Jones was an unassuming career backbencher, serving the constituency of Flydale North, who happened to be at 10 Downing Street when an alien spacecraft crash-landed in the River Thames in 2006. She was there to discuss plans for the Flydale Infirmary in her "tiny little" constituency. She soon discovered that the Cabinet had been infiltrated, and that the Acting Prime Minister, Joseph Green, was actually one of the Slitheen family in disguise (DW: Aliens of London).
When the Doctor arrived at Downing Street to consult on the crash, she tried to warn his companion Rose Tyler of what was happening, but the two were pursued by the unmasked aliens. Eventually she was trapped together with the Doctor and Rose in the Cabinet Rooms and aided the Doctor in determining the Slitheen's weaknesses. As the only elected representative present, Jones gave the Doctor the order to launch a Harpoon missile at Downing Street, killing the Slitheen before they could trigger off a nuclear war. Jones, the Doctor and Rose survived thanks to the reinforced steel walls of the cabinet rooms. The Doctor told Rose that Jones was destined to be a future Prime Minister, elected for three successive terms, and the architect of Britain's Golden Age. (DW: World War Three) The first of the Doctor's predictions came true some time after the Slitheen threat was ended, when she won election as prime minister. (DW: The Christmas Invasion)
During Jone's tenure, she presided over the launch of the Guinevere One space probe launched by the British Rocket Group and the extension of a Cottage Hospital scheme nationwide. It was the space programme that led to her being faced with an alien invasion by the Sycorax. Although the invasion was averted by the Doctor, Jones ordered the covert Torchwood Institute organisation to shoot down the retreating Sycorax ship. (DW: The Christmas Invasion)
Furious with Jones, the Doctor warned her he could bring her down with just six words, which he whispered to her aide: "Don't you think she looks tired?" Soon she was fending off rumours of ill-health and was facing a vote of no confidence (DW: The Christmas Invasion). She was removed from office soon after, and resented the Doctor's role in her downfall, though she stuck to her beliefs that the earth needed defense from alien invasion (DW: The Stolen Earth).
After leaving office, Jones continued to work behind the scenes in devising ways to protect the earth from alien intrusion, should the Doctor ever become unavailable. With the help of the Cooper Foundation (possibly connected to "Mr. Cooper", a man the Doctor once met in space (DW: Voyage of the Damned), she developed the Subwave Network, an intuitive system intended to seek out via computer anyone who has had extensive dealings with the Doctor.
Jones later used the Subwave Network to contact Sarah-Jane Smith; Captain Jack Harkness and Torchwood; and Martha Jones; an attempt to contact Donna Noble failed although her mother and grandfather, as well as Rose Tyler, were able to view the communication. She got them to pool their resources (Mr Smith; The Rift and Martha's Phone, respecitvely) to send a signal to call the Doctor. However in doing so she allowed the Dalek's to trace her signal and a squad of Daleks were sent to exterminate her. She remained defiant in her last moments, holding up her ID card saying "Harriet Jones, former Prime Minister". She said that the Daleks would face their downfall in underestimating the Human Race. The Daleks then apparantly had her exterminated. (DW: The Stolen Earth)
Parallel Earth
In Pete's World, that reality's version of Harriet Jones became President of Great Britain after the previous incumbent was killed by the Cybermen. (DW: Doomsday, referencing the events of Rise of the Cybermen)