Like the Doctor, the renegade formerly 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.
Colonel Masters
Used by the Master when infiltrating Rex Farrel's plastics company. (DW: Terror of the Autons)
Reverend Magister
Used by the the Master when infiltrating Devil's End. Magister was Latin for Master. (DW: The Dæmons)
Professor Thascalos
Used by this same incarnation when infiltrating the Newton Institute. Thascalos was Greek for Master. (DW: The Time Monster)
'Duke' Dominus
Used by that incarnation impersonating a gangster in 1930s Chicago. Dominus is also Latin for Master. (ST: The Duke of Dominoes)
Estro
Used by that incarnation 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 was Esperanto for Master. (EDA Legacy of the Daleks).
Sir Gilles Estram
Used by a later incarnation when attempting to avert the signing of the Magna Carta. Estram was an anagram of Master. (DW: The King's Demons)
Godspodar
Used when attempting to access the TITAN array in order to destroy the Chronovores. Godspodar was Serbian for Master. (PDA: The Quantum Archangel)
Mr. Seta
Used aboard the starship Gallery. It was another anagram of Master. (BFA: Dust Breeding)
Other Aliases
Dr Emil Keller
Used in in one incarnation when assuming the identity of the creator of the Keller Machine. (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 by the the same incarnation when posing as an Adjudicator (strangely enough). (DW: Colony in Space)
Melkur
An alias used by an incarnation of the Master while hiding inside his TARDIS. (The TARDIS, in this form, had a humanoid form.) (DW: The Keeper of Traken)
The Portreeve
Used by his his next incarnation when attempting to trap the Doctor in Castrovalva. (DW: Castrovalva)
Khalid
Used by this incarnation while attempting to take control of the Xeraphin gestalt. As Khalid, he affected the identity of a vaguely Arabian sorcerer. (DW: Time-Flight)
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: The TV Movie)
Professor Yana
Used after used a Chameleon Arch to make himself into a Human. (DW: Utopia)
For more information see Professor Yana
Harold Saxon
A Human alias adopted by his next incarnation, in which form he had himself elected as British Prime Minister (DW: The Sound of Drums/Last of the Time Lords)
- See separate article.