Aliases of the Master

Like the Doctor, the renegade Time Lord known as the Master used many aliases. 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 they were embarked upon at the time, creating entire personas out of many of them.
"The Master" was itself an alias. He chose this name, as the First Doctor did his, while attending the Academy. (TV: The Sound of Drums; AUDIO: The Destination Wars)
== True name ==
The Master's true name was spoken by a messenger to the Third Doctor as "a string of mellifluous syllables — one of the strange Time Lord names that are never disclosed to outsiders". (PROSE: Doctor Who and the Terror of the Autons) Missy claimed it had thirty-two letters. (PROSE: Lords and Masters) In one account, the Doctor and the Master both erased their names from history entirely as children, such that only they remembered it. (AUDIO: Blood of the Time Lords) The Celestial Intervention Agency's documents stated that the Master's real name had been purged from all Time Lord records after he and the Doctor left Gallifrey. (PROSE: CIA File Extracts)
== "Inventor" incarnation ==
Alias 	When used 	Story 	Etymology
The Inventor	when posing as a hero on the planet Destination	The Destination Wars	
== "UNIT era" incarnation ==
Alias 	When used 	Story 	Etymology
Koschei 	An old name the Master used while at Time Lord Academy, he resumed using it again sometime after he left Gallifrey 	The Dark Path 	In Russian folklore, hides his soul in an obscure location under many layers of protection so that he can never die.
Professor Carl Thascalos 	to give Jamie McCrimmon the Necronomicon, and to gain access to facilities of the Newton Institute 	The Nameless CityThe Time Monster 	Greek for master, pointed out by Jo Grant
Colonel Masters 	to infiltrate Rex Farrel's plastics company 	Terror of the Autons 	His typical alias with an s on the end
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 	Martin Jurgens is the Adjudicator whose credentials the Master stole. 	Colony in Space 	
A coincidental anagram of Master Gunnjir (gunnjir is the spear of Odin, head of the Norse pantheon)"Martin Jurgen" in the novelisation
Victor Magister 	to insinuate himself socially into the Devil's End community as a vicar, and later the name used when being charged for his crimes	The DæmonsWho Killed Kennedy 	Latin for master
Conran 	 	The Man in the Ion Mask 	
Prisoner M 	 	Harvest of Time 	The first letter of his typical alias
Jack Harris 	to use a stolen Ford Cortina to reach his TARDIS 	The Eight Doctors 	Name of car's original owner whom the Master had killed
Brigadier Lethbridge-Stewart 	to trick Sergeant Benton, and later the Third Doctor and Jo Grant 	The Time MonsterThe Heralds of Destruction	
Frey 	whilst in Sweden, 141 	The Spear of Destiny 	Old Norse for master
General Mayhew 	 	The Heralds of Destruction 	
Inspector LeMaitre 	to infiltrate a village fete by pretending to be a police inspector from Scotland Yard 	 	French for the master
Dook Domini 	In the 1930s 	The Duke of Dominoes 	Named after The Duke of Dominoes, a trump card in an old Wallarian game of chance which beat all other suits. Domini is also a Latin word meaning "lord" and "master."
Senator Szef 	 	The Seismologist's Story 	Polish for boss, chief
McMaster 	 	Doctor Who Fights Masterplan "Q" 	
Geoffrey Thynne 	to infiltrate Kenstone Hall 	The Touch of the Nurazh 	
Aloysius Fischer 	to infiltrate a UNIT Christmas party 	UNIT Christmas Parties: Christmas Truce 	Dr Aloysius Fischer was the person the Master assumed the identity of, though he assures the Doctor that Fischer is still alive. Aloysius is originally derived from the German name Chlodovech, meaning famous in war.
The Raffolite Ambassador 	 	The Same Face 	
Duke Dominus 	to impersonate a 1930s Chicago gangster 	The Duke of Dominoes 	Dominus from the Latin for lord or master of the house
Rupert Masters 	Claiming to represent the "Masters Corporation" 	Night Flight to Nowhere 	
The Doctor 	 	Anything You Can Do 	
Doctor Derek Drake 	 	Terror of the Master 	
Director Maestrom 	 	Master Thief 	
Juan Martino 	 	Anger Management 	Name of a football manager whom the Master had killed
Sam Quill 	 	Anger Management 	Name of a band manager whom the Master had killed
Father Wallingford 	 	Anger Management 	Name of a reverend whom the Master had killed
The Commissioner of Sirius IV	 	Frontier in Space 	
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
Professor Dominar 	 	Doorway to Hell 	Spanish for dominate
Megalomaniac's megalomaniac 	 	A Letter from the Doctor 	A title awarded to the Master by the readers of Dictator's Digest
== Decayed incarnation ==
Alias 	When used 	Story 	Etymology
Dr Damien Scott 	Whilst working for the Dominus Institute in the body of . 	Vampire of the Mind 	In French Damien means to subdue or tame, symbolising the Master's position in the Dominus Institute.
General Malgrove 	Whilst leading a faction of the Gorlan Empire. 	The Two Masters 	The Gorlan word for master
Van Houten 	In the 1890s 	Maurice 	Named after chocolates common in the time period.
Mr Dominus 	When visiting the Red Tavern in the 1890s 	Masterpiece 	Dominus from the Latin for lord or master of the house
Mwalimu 	while hiding beneath Colonel Spindleton's manor house in 1979	Trail of the White Worm	Swahili for master in the sense of teacher
Interplanetary Police Inspector Efendi	while on Secus 	The Evil One 	Turkish for "Master"
Mr Seta 	Used aboard the starship Gallery 	Dust Breeding 	Anagram of master
Dr John Smith 	Used while amnesiac on an unnamed colony world 	Master 	
Sir George Steer 	Possessed human 	Forgotten 	
Richard 	Possessed human 	Forgotten 	
Don Maestro 	Whilst trapped on Earth in the 20th century. 	Mastermind 	Italian for master in the sense of teacher
Michael Maestro 	Possessed human 	Mastermind 	Italian for master in the sense of teacher
Alien Artefact Alpha 1 	While being kept in the Vault. 	Mastermind 	
The Protector 	While on the planet Parrak 	Planet of Dust 	
Crispy 	nickname given by Missy 	Masterful 	
Jeremy 	Whilst under the care of Kitty 	Masterful 	
== "Tremas" incarnation ==
Alias 	When used 	Story 	Etymology
Tremas 	to deceive Nyssa on Logopolis after taking over her father's body 	Logopolis 	A coincidental anagram of "Master"
The Doctor 	to deceive Tovin on Restovan 	A Master of Disguise 	
The Portreeve 	to trap the Fifth Doctor in Castrovalva 	Castrovalva 	
Kalid 	used to take control of the Xeraphin gestalt 	Time-Flight 	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, coincidentally the name of a knight whom he impersonates.
Kevin Chaney 	when posing as an eccentric millionaire exhibiting a mask for free in various museums, so as to charge it with psychic energy	Tabby Cats And Time Lords	
Mr Tase 	 	The Velvet Dark 	An anagram of Master
The Sheriff 	to gain access to the regenerative fountain near Eternity, California. 	A Town Called Eternity 	
Professor Masterman	 	The Time Savers 	"Master"-man
Branko Gospodar 	to access the TITAN Array in order to destroy the Chronovores 	The Quantum Archangel 	Serbo-Croatian and Slovenian for master
Keith Potter 	Assumed identity of possessed body as part of a plan to dominate the dimensional nexus. 	The End of the Line 	
Alan Campbell 	 	Prisoners of Time 	
Dr Howard Chithros 	 	Stop the Pigeon 	
Dominus 	 	Crossing the Rubicon 	
Major Kreer 	used when allied with the Tzun in 1950s America. 	First Frontier 	Continued to use alias after his regeneration
== "Old" incarnation ==
Alias 	When used 	Story 	Etymology
Major Kreer 	used when allied with the Tzun in 1950s America.	First Frontier	
Count Marius Castillo	 	Housewarming 	
== "Bruce" incarnation ==
Alias 	When used 	Story 	Etymology
 	Occasionally reverted to impersonation of a San Franciscan paramedic named Bruce after he had taken over Bruce's body	Doctor Who 	Bruce Gerhardt in the novelisations
Daniel 	While hiding his true identity from River Song 	The Lifeboat and the Deathboat	
Brian 	Used when talking to Kitty on Kesta 	Masterful 	
Magnus Drake	Stolen identity 	Faustian, Prey 	
== "Reborn" incarnation ==
Alias 	When used 	Story 	Etymology
Dr Harcourt De'ath	To practise eye surgery on many patients, in order to literally "have eyes everywhere"	Time's Horizon, Eyes of the Master	Bar the apostrophe, De'ath is spelt the same way as "Death".
Kappa Chi 	Designation as CIA agent. 	The Death of Hope 	
Master-Builder 	When creating the Dalek Time Controller's new empire. 	The Monster of Montmartre 	
The Doctor 	Whilst masquerading as a future incarnation of the Doctor. 	Dominion 	
Michael Masterson 	Human in Hexford possessed while in the body of . 	And You Will Obey Me 	
== "War" incarnation ==
Alias 	When used 	Story 	Etymology
Mr Orman 	While helping the mining process of Callous 	The Glittering Prize 	
Cyber-Master 	Whilst masquerading as a Cyberman, superior to the Cyber-Controller.	Master of Worlds 	
TS Mereath 	In 19th century US. 	The Coney Island Chameleon	Anagram of "The Master"
Crazlus 	Masquerading as Crazlus to Narvin 	 	
Sorvad 	While pretending to be the late Davros' uncle on Skaro. 	The Master's Dalek Plan 	Davros spelled backwards. The Master claims this is a "family tradition".
The Doctor 	Whilst masquerading as the Doctor on Gardezza. 	Beneath the Viscoid 	
Dr Keller 	Whilst on Arcking. 	The Good Master 	Reusing alias from The Mind of Evil
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".
== "Saxon" incarnation ==
Alias 	When used 	Story 	Etymology
 	used to become Prime Minister of the United Kingdom 	The Sound of Drums 	Mister Saxon was a coincidental anagram of Master No Six; Harold is a derivative of Old English Hereweald meaning Master of the Armies
The Vanguard	a title used by Rassilon to describe the Master's role in the Ultimate Sanction 	The End of Time 	
Xanos 	 	The Night Harvest 	
Bal'kalu 	 	The Night Harvest 	
Mr Razor 	used while on board a Mondasian colony ship 	World Enough and Time	The Old English word for knife is seax, which is what the name Saxon originated from. His name, then, is ostensibly "Mr Saxon".
Alpha 7 	designation for the Mondasian Cybermen created on a colony ship for Operation Exodus	Alit in Underland 	
== "Missy" incarnation ==
Alias 	When used 	Story 	Etymology
Mrs. Braithwaite 	After marrying Bobo Braithwaite 	Dismemberment 	
Missy 	New name adopted shortly after regenerating into female form 	Deep Breath, Dark Water 	Short for "Mistress", feminine form of "Master".
Mobile Intelligence Systems Interface	Ruse allowing close contact with and delaying recognition by the Doctor	Dark Water 	Backronym from "Missy"
Miss Magister 	When posing as a teacher 	Yes, Missy 	Latin for master
Beatrice Foxcroft 	When meeting with the Monk, who was disguised as Henry VIII 	Divorced, Beheaded, Regenerated	Beatrice means "bringer of joy or blessings", as one would expect a queen to
Doctor Who 	When practising being good aboard a Mondasian colony ship 	World Enough and Time 	
M.I.S.S.Y. 	While posing as a hologram 	Missy's Magical Mystery Mission	An initialism of "Mr Iarbus's Special Space Yummy"
Miss E 	 	Missy's Magical Mystery Mission	
Qui Quae Quod 	While masquerading as a sorcerer 	Masterful 	Used by the Third Doctor. (TV: The Dæmons)
== "Spy" incarnation ==
Alias 	When used 	Story 	Etymology
O 	Assumed identity of an MI6 member who he had shrunk with the Tissue Compression Eliminator.	Spyfall 	While posing as "O", the Master claimed he was named as such as a joke; whenever "O" met with C, C would exclaim "Oh, God!" After revealing himself, however, he explained that he chose the name for satisfaction, anticipating correctly that the Thirteenth Doctor would exclaim "Oh..." as he dropped the act.
Officer O 	Alias used while allied with the Third Reich. 	SpyfallCrack Noor's Code	
Mikhail Afanasyevich Gospodinov	 	The Master and Margarita	"Gospodin" is one of the many variations of the word "Master" being translated in Russian.
Grigori Rasputin 	Impersonating, while in Russia, 1916 	The Power of the Doctor 	
The Doctor 	Insisting on the name after force regenerating the real Doctor into himself 	The Power of the Doctor 	
== "Exile" universe ==
Alias 	When used	Story	Etymology
Roger 	 	Exile	A reference to actor Roger Delgado, who portrayed beginning in Terror of the Autons.
Peter 	 	Exile	A reference to actor Peter Pratt, who portrayed in The Deadly Assassin.
Geoffrey	 	Exile	A reference to actor Geoffrey Beevers, who portrayed beginning in The Keeper of Traken.
Tony 	 	Exile	A reference to actor Anthony Ainley, who portrayed beginning in The Keeper of Traken.
Eric 	 	Exile	A reference to actor Eric Roberts, who portrayed beginning in The TV Movie.
Robert 	 	Exile	A reference to actor Eric Roberts, who portrayed beginning in The TV Movie. The use of this name led the Doctor to mistake Bob for the Master.
Sam 	 	Exile	A reference to "Sam Kisgart", the anagrammatic pseudonym used by actor Mark Gatiss, who portrayed the Unbound Master beginning in Sympathy for the Devil.
== Other ==
Incarnation 	Alias 	When used 	Story 	Etymology
Various early incarnations including in the Tower 	Koschei 	At the Time Lord Academy and in subsequent adventures 	Divided Loyalties, Rebel Rebel	In Russian folklore, the sorcerer was a tyrannical king who hid his soul in an obscure location under many layers of protection so that he can never die.
Various early incarnations including during his falling-out with the First Doctor 	Magnus 	At the Time Lord Academy and in his subsequent public life on Gallifrey 	Flashback, Goth Opera 	Means "great" in Latin. (This was the letterer's interpolation; the writer originally intended for the name to be "Magus", Latin for "Sorcerer".)
Unclear 	Kaschei Stravisnky	While posing as a Russian scientist 	The Schizoid Earth 	
Alleged sixth incarnationIn accounts alleging that the War Chief and the First Monk were early incarnations of the Master; in many other accounts, these are distinct characters.	The Monk 	While experimenting with Earth's causal nexus in 11th century Northumberland	CIA File Extracts 	
"War Chief" incarnation 	"The War Chief" 	While acting as War Chief in the War Lord's army 	The War Games 	
"Merlin" incarnation 	The Merlin 	While interfering in Camelot 	The Creation of Camelot 	"Merlin" is depicted in the story as being a title for the royal magician of King Arthur's court.
== 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 Castrovalva.
* Another, craftier pseudonym was used in Radio Times for The King's Demons, when Sir Gilles was listed as being played by "James Stoker" — an anagram of "Master's Joke". This name was confirmed as an alias used by the Master in-universe at some point before the events of Planet of Fire in the novel CIA File Extracts.
* In Sympathy for the Devil, Mark Gatiss, who voiced an alternate version of the Master, is credited as "Sam Kisgart", an anagram of the actor's name. When this incarnation of the Master returned in The New Adventures of Bernice Summerfield, Gatiss was again credited as Kisgart but the joke was dropped out for later stories.
* In the previews of Ascension of the Cybermen, the Spy Master's return for the cliffhanger was foreshadowed by "Barack Stemis" being credited for a character called "Fakout" at the end of the cast-list. "Barak Stemis" is an anagram of "Master is back", while "Fakout" sounds like "fake-out".
* In the DVD commentary for TV: The Lazarus Experiment, Mark Gatiss claimed that "Saxon" was an anagram of "Axons", made in reference to TV: The Claws of Axos.
* Professor Stream in The Hollows of Time was originally intended to be a pseudonym of the "Tremas" Master, but copyright restrictions prevented them from making this explicit in the story. "Stream", like "Tremas", is an anagram of "Master". The story is listed as a Master one on the Big Finish website.https://www.bigfinish.com/collections/v/the-master
== Footnotes ==