Saxon Master

Harold Saxon was an alias and identity adopted by the Master.

Regeneration
Recently liberated from the Human form of Professor Yana, he fatally wounded his assistant, Chantho, who though dying, fired a gun at him. The wounded Master managed to get into the Doctor's TARDIS. He decided that since the Doctor had a youthful new body, he could do and so regenerated into one. The Master then left the Doctor on the planet Malcassairo with Futurekind about to burst in the laboratory door. (DW: Utopia)

Career pre-election
The Master now had the TARDIS and the Doctor's hand, which Jack Harkness had taken with him to Malcassario, at which, which contained some of the Doctor's DNA.

He took the stolen TARDIS to Earth in the 2000s, about one and a half years before the Doctor had even met his current companion Martha Jones. He took on the name Harold Saxon and began establishing an identity for himself as a politician. He also established the Archangel telecommunications network. The Archangel Network carried a subtle mind control signal which seeped into the subconscious of everyone who heard it and made them trust him. The network effected the Doctor so that, on Earth earlier, he had never had any suspicions as to "Saxon". To those few Humans sonscious of it, the networks' signal sounded the persistent drumbeat (the same as the constant drumbeat the Master always heard) that only they could hear. The Master also contacted the Toclafane, the child-like yet vicious cyborg remnants of the future Humans who had never found Utopia. (DW: The Sound of Drums)

He later implied he had a hand in sponsoring the rejuvenation experiments of Richard Lazarus which used lasers, so that he could make use of the results later. The Master also had a hand in the design of the UNIT air carrier, The Valiant. More trivially, he also created a laser screwdriver which made use of Lazarus' discoveries to later age the Doctor. (DW: The Sound of Drums)

He was active from at least April 2007 when he started campaigning for the general election as Prime Minister of Great Britain (DW: Love & Monsters). By Christmas] of 2007 he had enough authority to order the British Army to destroy the Empress of the Racnoss]'s [[webstar. (DW: The Christmas Invasion) At some point he also took a Human wife, Lucy and contacted the Toclafane. He cannibalised the TARDIS and converted it into a paradox machine. (DW: The Sound of Drums)

He used the simple slogan "Vote Saxon" (TW: Captain Jack Harkness) "Saxon" asserted that extraterrestrial life did exist and that the British must do something about the fact. This stance made him popular in early 2008 after reports from the Judoon having transported the Royal Hope Hospital to the Moon (DW: Smith and Jones)

As Prime Minister
In 2008, he was elected as Prime Minister. He gassed to death his cabinet in the recently rebuilt 10 Downing Street and shortly afterwards announced first contact with the "friendly" Toclafane. He put Jack Harkness]'s allies, [[Torchwood 3 on a futile trip to find him in the Himalayas and branded the Doctor, Jack and Martha as criminals. The Master repaired to The Valiant, which the governments of Earth considered neutral territory and therefore fitting for formal first contact with alien life, the Master had the Toclafane murder the American President Elect Arthur Coleman Winters. The Master captured the Doctor and Jack Harkness, who had come to The Valiant.

During The Year That Never Was
The Master used his laser screwdriver to kill Jack and to age the Doctor about a hundred years. Martha managed to escape. The Master ordered the Toclafane to kill one tenth of humanity and commenced their invasion (DW: The Sound of Drums ). One year later, in 2009, the Master had converted Earth into a slave camp which he ruled from The Valiant. Here the Doctor kept Martha's family, the Doctor and Jack prisoned. The Master hoped to soon expand his New Time Lord Empire into space. Martha used the legend of the Doctor, which she had spread, and the thoughts of Earth thinking "Doctor" at the same time, channelled their psychic energy through the Archangel Network, which the Doctor had spent a year infiltrating with telepathy. The psychic energy restored the Doctor and give him telekinetic powers. Jack attacked the paradox machine and reversed time back one year. (This did effect anyone aboard The Valiant.) Lucy shot her husband, who, defeated, refused to regenerate. The Master then died in the Doctor's arms.

An unknown woman, however, stole the Master's ring, with a Gallifreyan insigna, from his funeral bier. The identity of the person and significance of this action, if any, remains unclear. (DW: The Sound of Drums)