Harold Saxon is an identity assumed by the Master, who is a frequent character in the popular British science fiction television series, Doctor Who. When Utopia was nearing its end, the Master was fatally injured by one of his own companion. This is when he flees by taking Doctor's TARDIS- the fictional spacecraft and time machine. However, the Master was unaware of the fact that the TARDIS was sabotaged by the Doctor, and that he could only travel between the present day Earth and the year hundred trillion. Finally, he arrives on Earth and the place we know as United Kingdom just before the year 2008 campaign.
To fit among the Earth people the Master becomes a top political person holding a rank of a minister in the Ministry of Defense, surrounded be security out guards and known as Harold Saxon. He is seen holding this position till the year 2006 Christmas period of the TV series. While in his post, The Master funds the project set-up by Professor Richard Lazarus. This project revolves around the development of Archangel Communications Network, which enables the Master to control human beings using a telepathic medium. The reason for doing so is to enable Harold Saxon to rise and become the Prime Minister of the United Kingdom.
As soon as the Master becomes the Prime Minister, he used the Doctor's TARDIS to employ Toclafane as his allies. The Toclafane were responsible of wiping out almost 1/10 of the global population allowing them to rule the Earth for a year. Meanwhile, Harold Saxon or the Master turns the entire nation as his workforce and creates bases for his fleet of war ships. While all this is happening, the Doctor is brought back to his power using the Archangel Network by Martha Jones. The Doctor plans on keeping the Master on the TARDIS but his intentions comes to an end when the Master is killed by his own wife.
Even as he is dying, the Master sees this as his victory because the Doctor fails to capture him and while his body is being cremated on the pyre; his remains are collected by a woman who is later found out to be a faithful follower of the Master. However, this was just the beginning and it soon became a part of the popular British culture.