Aliases of the Master

Like the Doctor, the renegade Time Lord known as the Master (who, according to some sources, was once known as Koschei) has employed a number of aliases in the course of his career. However, while the Doctor tends to use false names on a fairly ad hoc basis in order to avoid awkward questions, the Master usually adopts them in order to further whatever scheme he is currently embarked upon.

Variations on 'the Master'

The Master

The Master has effectively discarded his former name. He and the Doctor refer to each other by their titles as a matter of course. While earlier in his life he was heard saying that he was "known as" the Master, by the time of his final confrontation with the Doctor's tenth incarnation, he considered "The Master" to be his name (DW: The End of Time).

UNIT era aliases

During a period when the Master came into frequent and regular contact with Earth's then-United Nations Intelligence Taskforce and the Doctor's third incarnation, he used a number of aliases, many of which were plays of the name "Master".

Colonel Masters

Used when infiltrating Rex Farrel's plastics company. (DW: Terror of the Autons)

Reverend Magister

Used when infiltrating Devil's End. Magister is Latin for Master. (DW: The Dæmons)

Professor Thascalos

Used when infiltrating the Newton Institute. Thascalos is Greek for Master. (DW: The Time Monster)

'Duke' Dominus

Used when impersonating a gangster in 1930s Chicago. Dominus is also Latin for Master. (ST: The Duke of Dominoes)

Estro

Used while posing as an adviser to Lord Haldoran follwing the 22nd century Dalek invasion on 2299 Earth, in an effort to procure a Dalek matter-transmuter. Estro is Esperanto for Master. (EDA Legacy of the Daleks).

Dr Emil Keller

Used in one incarnation when assuming the identity of the creator of the Keller Machine. Emil is derived from the Latin word aemulus, meaning rival, and Keller is derived from Old English cwellere, meaning executioner. (DW: The Mind of Evil)

In an alternate timeline the Master used this identity when working for the government of China, during which time he was known as Ke Le. (DWU: Sympathy for the Devil.)

The Adjudicator (Martin Jurgens)

Used when posing as an Adjudicator. (DW: Colony in Space)

Godspodar

Used when attempting to access the TITAN Array in order to destroy the Chronovores. Godspodar is Serbian for Master. (PDA: The Quantum Archangel)

Mr. Seta

Used aboard the starship Gallery. It was another anagram of Master. (BFA: Dust Breeding)

Melkur

An alias used by an incarnation of the Master while hiding inside his TARDIS, just prior to his taking over Tremas and becoming a new incarnation (DW: The Keeper of Traken).

The Portreeve

Used by the Tremas incarnation when attempting to trap the Doctor in Castrovalva. (DW: Castrovalva)

Kalid

Used by the Tremas incarnation while attempting to take control of the Xeraphin gestalt. As Kalid, he affected the identity of a vaguely Arabian sorcerer. Kalid derives from the Indian Kalidasa meaning servant of Kali, an Indian goddess of time and change and usually depicted as being dark and violent. (DW: Time-Flight)

Sir Gilles Estram

Used by this same incarnation when attempting to avert the signing of the Magna Carta. Estram was an anagram of Master. (DW: The King's Demons)

The Sheriff

Used by this incarnation trying to gain access to the regenerative fountain near Eternity. (ST: A Town Called Eternity)

Major Kreer

Used when allied with the Tzun in 1950s America. (NA: First Frontier)

Doctor John Smith

Used while living as an amnesiac on an un-named colony world. The Doctor also frequently used this alias. (BFA: Master)

Bruce

The name of the paramedic whose body the Master possessed in San Francisco in 1999. The Master assumed his identity on a number of occasions during this affair. (DW: Doctor Who)

Professor Yana

Main article: Yana

Used after he had transformed himself into a Human by means of a Chameleon Arch. (DW: Utopia) The Doctor's discovery of the Master's survival after the Last Great Time War had been foreshadowed by an encounter with the Face of Boe, who has uttered "You are not alone" as his dying words. (DW: Gridlock) The Doctor later learned this was an acronym for YANA. Yana was shot by Chantho and became one of the few incarnations of the Master known to have undergone a natural regeneration into...

Harold Saxon

Main article: Harold Saxon

A Human alias adopted by the new incarnation of the Master, in which form he had himself elected as British Prime Minister (DW: The Sound of Drums/Last of the Time Lords). However, by the time of his final confrontation with the Doctor's tenth incarnation, the Master had distanced himself from the Saxon alias and was once again calling himself, simply, the Master. (DW: The End of Time)

'Mister Saxon' is an anagram of 'Master No Six' and John Simm, who played this incarnation of the Master, was the sixth major incarnation the character.