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) used many aliases in the course of his career. However, while the Doctor used false names on a fairly ad hoc basis to avoid awkward questions, the Master usually adopted them in order to further whatever scheme he was currently embarked upon.

The Master
The Master effectively discarded his former name. He and the Doctor referred 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" 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 United Nations Intelligence Taskforce and the Doctor's third incarnation, he used 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)

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)

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

Mwalimu
Used while hiding beneath Colonel Spindleton's manor house in 1979. It is Swahili for 'Teacher' or 'Master'.(BFA:Trail of the White Worm)

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).

Gospodar
Used when attempting to access the TITAN Array in order to destroy the Chronovores. Gospodar 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 taken on by the decaying 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 Fifth 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 YANA was an acronym for this. Yana was shot by Chantho and regenerated 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 of the character. 

Behind the Scenes

 * During Anthony Ainley's tenure as the Master, pseudonyms made from anagrams of 'Tony Ainley' were often used in the credits — both on-screen and in Radio Times — for the Master's disguises, such as Neil Toynay for the Portreeve in DW: Castrovalva.
 * Another craftier pseudonym was used in Radio Times for DW: The King's Demons, when Sir Gilles was listed as being played by 'James Stoker' — an anagram of 'Master's Joke'.