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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.
| Alias | When used | Story | Etymology |
|---|---|---|---|
| Colonel Masters | to infiltrate Rex Farrel's plastics company | Terror of the Autons | |
| Reverend Magister | to insinuate himself socially into the Devil's End community | The Dæmons | Latin for master |
| Professor Thascalos | to gain access to facilities of the Newton Institute | The Time Monster | Greek for master |
| Duke Dominus | to impersonate a 1930s Chicago gangster | The Duke of Dominoes | |
| Emil Keller | assumed identity of the creator of the Keller Machine | The Mind of Evil | Emil is derived from the Latin word aemulus, meaning rival, and Keller is derived from Old English cwellere, meaning executioner |
| Martin Jurgens | while posing as an Adjudicator | Colony in Space | |
| Mwalimu | while hiding beneath Colonel Spindleton's manor house in 1979 | Trail of the White Worm | Swahili for master in the sense of teacher |
| Estro | while posing as an adviser to Lord Haldoran in an effort to procure a Dalek matter-transmuter. | Legacy of the Daleks | Esperanto for master |
| Gospodar | to access the TITAN Array in order to destroy the Chronovores. | The Quantum Archangel | Serbian, Croatian and Slovenian for master |
| Mr Seta | Used aboard the starship Gallery | Dust Breeding | anagram of master |
| The Portreeve | to trap the Fifth Doctor in Castrovalva. | Castrovalva | |
| Kalid | used to take control of the Xeraphin gestalt. | Time-Flight | 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. |
| Sir Gilles Estram | to avert the signing of the Magna Carta in 1215. | The King's Demons | Estram is a simple anagram. |
| The Sheriff | to gain access to the regenerative fountain near Eternity. | A Town Called Eternity | |
| Major Kreer | used when allied with the Tzun in 1950s America. | First Frontier | |
| Dr John Smith | Used while amnesiac on an unnamed colony world. | Master | |
| Bruce | occasionally reverted to impersonation of a San Franciscan paramedic named Bruce after he had taken over Bruce's body | Doctor Who | |
| Professor Yana | chameleon arch identity | Utopia | Had no known meaning of its own, but the Face of Boe made up an acronym, "You Are Not Alone" |
| Harold Saxon | used to win Prime Ministership of the United Kingdom | Love & Monsters and several other stories | Mister Saxon was an anagram of Master No Six |
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 TV: Castrovalva.
- Another, craftier pseudonym was used in Radio Times for TV: The King's Demons, when Sir Gilles was listed as being played by 'James Stoker' — an anagram of 'Master's Joke'.