The Master

The Master, known in female form as Missy (short for Mistress) and at times by various other aliases, was a renegade Time Lord, originally a friend and long an opponent of the Doctor.

Though they had been friends from childhood (TV: The End of Time, Death in Heaven) and schoolmates at the Academy (TV: The Sea Devils, The Time Monster, The Five Doctors) before falling out, the Master developed an intense hatred for and often sought to kill the Doctor, who came to regard the Master as his arch-enemy. (TV: The Deadly Assassin, Castrovalva, Time-Flight, Doctor Who) Despite this enmity, however, the Master and the Doctor would on occasion act as allies. (TV: The Claws of Axos, The Five Doctors, The End of Time)

The Master's diabolical madness was at least partially the result of a genuine malady in the form of a never-ending drumming sound that had been retroactively implanted inside his head by Rassilon and the High Council on the final day of the Last Great Time War to further their own goals. (TV: The End of Time)

Early life
The Master grew up on Gallifrey in the House of Oakdown, (PROSE: Divided Loyalties) though he would later comment to Wilfred Mott that growing up on Gallifrey was not something one could call childhood, but "more a life of duty". (TV: The End of Time)

Sharing the same heritage and upbringing, (AUDIO: UNIT: Dominion) the Master had a friendship with the First Doctor (GAME: Destiny of the Doctors; TV: The Sound of Drums) and his family, (AUDIO: The Toy) with UNIT scientist Osgood even describing the Master as the Doctor's "childhood friend". (TV: Death in Heaven) The Second Doctor recalled that he and the Master had everything in common, except that the Master enjoyed being scared of the dark "a little too much". (PROSE: The Menagerie)

The two youths would play in the fields near the Master's father's estates, with pastures of red grass near Mount Perdition. (TV: The End of Time) They would also sneak out of the Capitol and drink with the Shobogans, (PROSE: The Eight Doctors) with the young Master picking a fight with six drunken Shobogans one of these outings. (PROSE: UNIT Christmas Parties: Christmas Truce) The Master also taught his friend hypnotism. (PROSE: The Dark Path)

During their childhood, the young Master and the Doctor had been mercilessly and viciously bullied by a boy called Torvic; the young Doctor was eventually forced to kill the bully to save his friend's life. He was later confronted by the personification of Death, who insisted he become her disciple, but the Doctor refused and suggested Death make the Master her champion instead. Death agreed, and the Doctor subsequently forgot about their deal. (AUDIO: Master)

Like all Time Lords, the Master was taken for his initiation at the age of eight. During the ceremony in which he gazed into the Time Vortex through the Untempered Schism, he went mad, (TV: The Sound of Drums) as the result of a a rhythm of four beats being implanted into his head. (TV: The End of Time) This malady manifested itself as the constant drumming he heard ever after, worsening with time. (TV: Utopia, The Sound of Drums, Last of the Time Lords)

Academic career
The Doctor, the Master and the War Chief were friends from their first day at the Academy, (PROSE: Divided Loyalties) with both the Doctor and the Master tutored by Borusa. (AUDIO: Masterplan) The Master was also in charge of organising end of term parties, but the Eighth Doctor later noted that they "weren't very good". (COMIC: The Glorious Dead)

At the Academy, the Master belonged to a clique of ten young Time Lords with the collective name of the Deca, (PROSE: Divided Loyalties) and was also part of the "Gallifrey Academy Hot Five" band, in which he played the drums. (PROSE: Deadly Reunion)

The Master would often hypnotise people as a joke, (PROSE: The Dark Path) and would go unpunished for it, as well as other misdemeanors, always finding a way to avoid his comeuppance. (PROSE: First Frontier)

Whilst at the Academy, the Doctor and the Master travelled into Gallifrey's past in search of Valdemar. They found nothing of the Old Ones except for warnings. The Master was fascinated by the power that Valdemar represented, while the Doctor was horrified. (PROSE: Tomb of Valdemar) The Master showed a fascination with the Necronomicon. (PROSE: The Nameless City)

When the Time Lords created the Consolidator to conceal various dangerous historical secrets from the rest of the universe, unwilling to destroy the items or races in the ship in case they proved useful later, the Doctor and the Master were assigned to come up with a solution where their peers failed. The Master had the idea of using a black hole to tear a rift in time and send the Consolidator into the distant future, where the future Time Lords could deal with it. However, when the experiment was actually attempted, the Consolidator was apparently destroyed by a mistake in the calculations when it struck the edge of the black hole, leaving the Time Lords to hush the matter up. (PROSE: Harvest of Time)

The Master ultimately did not perform well at the Academy. (AUDIO: Masterplan)

Family life
Missy claimed she had a daughter and that, while still on Gallifrey, the Doctor gifted her a brooch made of dark star alloy after an event which involved her daughter occurred. (TV: The Witch's Familiar)

The Master attended a ritual in Arcadia where he gave Susan Foreman a communication node disguised as a toy, with the Master intending to use the node to locate the Doctor if he ever left Gallifrey. (AUDIO: The Toy)

Fleeing Gallifrey
According to one source, during a period of civil unrest on Gallifrey, he led many students of the Time Lord Academy in a revolt against the corrupt Lord President, Pundat the Third, and attempted to recruit the Doctor and convince him to take the position as President, but he decided not to interfere with the current constitution. When Pundat died of stress soon after the revolt, his chosen successor was the evil Chancellor Slann. The students had found the last of Lord Rassilon's descendants, Lady Larn, a seven-year old child adopted by Councillor Brolin, who was being groomed as a future president. They decided on a second coup. Yet in trying to convert the Doctor, the students were overheard. Bloody reprisals against the students followed. The Doctor and Larn escaped from Gallifrey after this. Believing the students ready for the second coup, the Master assassinated Lord President Slann. However, the students weren't ready and he took this opportunity to steal a TARDIS and flee Gallifrey as a renegade. (PROSE: Birth of a Renegade)

Dealings with the Second Doctor
After the Doctor fled Gallifrey in a stolen TARDIS, the Master left Gallifrey on the same day in his own stolen TARDIS, (COMIC: The Glorious Dead) surprised to find no one chasing him. However, his unstable obsession with order prompted the Time Lords to plant the Time Lady Ailla as a spy to monitor his actions. She posed as a human so Koschei (as the Master had now started calling himself) would take her on as his companion during a stopover in the 28th century.

Koschei caught up with the Second Doctor at the Darkheart colony in the early years of the Galactic Federation. The temptation posed by the Darkheart device proved too much for Koschei, and the revelation that Ailla was a spy killed the last traces of good in him, and he became the Master. After the Doctor trapped him in a black hole, the Master swore that he would take revenge. (PROSE: The Dark Path)

Escaping the black hole, the Master penetrated Gallifrey, and gained access to the Matrix via a console in the old Capitol. This gave him a back door into the Matrix, which he used to collect classified information for his many devious schemes, (PROSE: The Quantum Archangel) including the Time Lords' files on the Doomsday Weapon. (TV: Colony in Space)

The Master then put his TARDIS in orbit of the homeworld of the Archons and made a deal with them that would result in the Archons acquiring the Doctor's TARDIS for themselves. Posing as a Professor Thascalos, the Master gave the Necronomicon to the Doctor's companion Jamie McCrimmon, so that Jamie would give the book to the Doctor and lure the TARDIS to the Archon homeworld. (PROSE: The Nameless City)

Early times on Earth
When the Doctor was exiled to Earth, the Master was imprisoned on Shada by the Time Lords. However, the Time Lords decided to keep the Doctor busy whilst he was trapped on Earth by releasing the Master. (PROSE: Prisoners of the Sun)

The Master was present at the first Auton invasion of Earth, and heard about Channing's attempt to capture the Third Doctor. He contacted journalist James Stevens by phone, whose article he had read in the Daily Chronicle, and told him about the near-kidnapping. He called Stevens again during the Silurian attacks on Wenley Moor, informing Stevens that Edward Masters had been the first to die from the plague sweeping London. (PROSE: Who Killed Kennedy)

Under the alias "Emil Keller", the Master captured a psychic parasite and trapped it within the Keller Machine, and spent many months establishing "Keller" and the machine's credentials. (TV: The Mind of Evil)

Shortly after the Inferno Project incident, the Master once more contacted James Stevens, this time to check up on his work on his UNIT article. He promptly hung up when Stevens mentioned C19 and the Glasshouse. (PROSE: Who Killed Kennedy)

The Master first infiltrated the headquarters of UNIT while the Brigadier and the Doctor had gone to meet with government officials. He hypnotised the Doctor's assistant, Liz Shaw, and, through her, learned of the failed Nestene invasion and the awakening of the Silurians. This inspired him to ally himself with the Nestene and to locate more Silurian colonies. (PROSE: Reconnaissance)

Becoming a threat
The Master appeared at the International Circus, his TARDIS in the form of a horse box. He hypnotised the circus troupe and plastic factory manager Rex Farrel to obey his orders as part of his plan to assist the Nestenes in their latest bid to conquer Earth. A Time Lord emissary alerted the Doctor to his rival's presence on the planet, and before the radio telescope could be used to bring the Nestene invasion force to Earth, the Doctor convinced the Master that the Nestenes would not distinguish between the Master and anyone else in their takeover, and the two worked together to fling the Nestenes back into space by "chang[ing] the polarity" whilst the radio telescope's transfer shift was still open. Afterwards, the Master fled. The Doctor, however, had already taken his dematerialisation circuit, preventing the Master from leaving Earth in his TARDIS. (TV: Terror of the Autons)

The Master returned again, posing as the scientist who had "developed" the Keller Machine. He used prisoners as a plan to hijack the Thunderbolt, a missile containing nerve gas and use it to destroy the world peace conference, which would trigger a nuclear war. The Doctor stopped him and destroyed the missile, but later discovered he had lost the Master's dematerialisation circuit. Shortly after, the Master telephoned to let it be known that he had found the circuit and was free now to come and go as he pleased, while the Doctor had to remain in exile. (TV: The Mind of Evil)

Shortly after the Master regained control over his TARDIS, he tried to gain control of a cult so he could harness the power of the Immortals. He convinced the real cult leader, Hadley, that he could serve the cult loyally, by supplying them with sarg. Unfortunately for the Master, Hadley only intended to keep the Master alive while he was still useful. With no other options, the Master formed a temporary truce with the Doctor to stop Hades' plan. After the crisis was resolved, the Doctor allowed the Master to depart unmolested in the name of their temporary truce. (PROSE: Deadly Reunion)

The Master brought Axos to Earth, hoping to ally himself with them. Instead, he became the prisoner of Axos, and only escaped by saying that he would help it. The Doctor tricked the Master into thinking he was going to betray Earth. Instead, he trapped the Master with Axos in a time loop. (TV: The Claws of Axos)

Posing as an Adjudicator, the Master travelled to a human colony on the planet Uxarieus in the year 2472. There, the Time Lord records indicated he would find the Doomsday Weapon created by a near-extinct native species. Once again the Doctor defeated his plans and the weapon was destroyed. (TV: Colony in Space)

In the Wiltshire village of Devil's End, the Master summoned the ancient Dæmon Azal, but he failed to understand the power and control that was necessary following summoning him. Following Azal's confrontation with Jo Grant's selflessness, he was captured by UNIT following a failed attempt to escape in the Doctor's car, Bessie. (TV: The Dæmons)

In custody
Prior to his trial, the Master was sent to Stangmoor Prison. During his captivity, an army of hypnotised salespeople stormed the facility and attempted to rescue him, but the ploy failed and the Master was sent to another secure holding facility. Meanwhile, the Doctor and Jo were trapped in an extra-universal prison by the Freedom Corporation, so the Brigadier was forced to strike a deal with the Master to save them. But the Master double-crossed him and used time travel technology to regress the Earth backwards in time. However, with help from the Time Lords, the Doctor was freed and was able to stop the Master's plan and restore everything to normal. (PROSE: Freedom)

After a trial by human authorities, the Master was sentenced to life-long imprisonment on an island off of the coast of England, one designed especially to hold him. (TV: The Sea Devils) The government used him as a scapegoat for all the alien attacks which had recently occurred. (PROSE: Who Killed Kennedy)

Before he was sent to the island, the Master was sent to Aylesbury Grange Detention Centre. The Doctor visited the Master, who insisted he had changed, only to reveal he had escaped and that the Doctor was speaking to a hologram. The Master nearly escaped, but was stopped by soldiers, and the Doctor revealed he had been a hologram as well. (COMIC: The Man in the Ion Mask)

While in custody, with the Doctor gone to Peladon, (TV: The Curse of Peladon) the Master collaborated with UNIT to prevent an invasion by a fascist version of Earth, travelling with the Brigadier, Ian and Barbara Chesterton to the alternate universe and encountering an Koschei, the alternate version of himself. Koschei was imprisoned and tortured by order of the Leader of the Republic of Great Britain, the alternate version of the Doctor. The Master killed his other self, claiming it was an act of mercy. Before he was imprisoned by UNIT again, the Master hid his TARDIS back in the church crypt in Devil's End. (PROSE: The Face of the Enemy)

In another escape attempt, the Master created a device that switched his mind with the Doctor's. He went to the Doctor's TARDIS, where he learned that the Time Lords had made the TARDIS ineffective to the Doctor's piloting. Before returning to his own body, the Master, as the Doctor, asked the Brigadier to move the Master to a new holding facility with a good view, and also encouraged Mike Yates to ask Jo Grant out on a date. (PROSE: The Switching)

When he was finally sent to Fortress Island, the Master quickly gained control over his jailer, George Trenchard, and nearly caused a war between humans and Sea Devils, a species related to the Silurians. He later escaped in the confusion, (TV: The Sea Devils) and returned to the church crypt in Devil's End to retrieve his TARDIS. (PROSE: The Eight Doctors)

At large again
Some time after his escape, the Master took control of the Glasshouse, a facility for traumatised UNIT soldiers, and in particular Private Francis Cleary. He planned to use a time ring to have Cleary go to 1963 to prevent the Kennedy assassination, thereby altering Earth's history to make it more vulnerable to invasion. The plan failed. (PROSE: Who Killed Kennedy)

Posing as "Professor Carl Thascalos", the Master constructing a machine known as TOMTIT at Cambridge's Newton Institute to summon the ancient chronovore Kronos that he wished to control. He hypnotised the institue's director, Dr. Charles Percival, but accidentally killed him, however, by releasing Kronos from the Crystal of Kronos. The Master summoned the Atlantean priest Krasis for instructions on how to control Kronos, while meddling with the flow of time to obstruct the Doctor from getting in his way.

After knocking out Sergeant Benton, the Master retreated to his TARDIS, but the Doctor tried to trap him in a time lock using his own TARDIS, accidentally creating a space loop when both TARDISes were materialised within the other. When the TARDISes were separated during their negotiations, the Master ejected the Doctor into space, but the Doctor survived by using the telepathic circuit of his TARDIS to help Jo return him to safety.

The Master travelled to ancient Atlantis and failed to hypnotise King Dalios, who easily resisted his influence. Confronting the Doctor there, the Master tried to manipulate Queen Galleia into betraying her husband, since she had taken a romantic liking in his charm compared to Dalios's often dull personality. Galliea, however, was enraged when the Master caused Dalios to die in the coup they staged in Atlantis. Before he was arrested, the Master commanded Krasis to use the Crystal of Kronos housed in Atlantis, and brought forth Kronos, who destroyed the entire civilisation.

Fleeing Atlantis with Jo as his hostage, and with Kronos under his control, the Master was in a position to cast destruction unto the entire cosmos, however, the Doctor threatened to time ram the Master's TARDIS with his own, which would take everyone's lives in the process if he did not give up his plans for chaos. The Master did not believe the Doctor would earnestly carry out his warning, because he knew endangering Jo's life was not an option for him. In response to the Doctor's hesitation, Jo tried to complete the time ram before the Master could release Kronos again. Instead, Kronos spared everyone from death, and captured the Master for the crime of trying to control it, but allowed him to go free at the request of the Doctor. (TV: The Time Monster)

Having had enough of Earth, and other plans to set in motion on Skaro, the Master employed the assistance of a being called Verdigris to impersonate him. (PROSE: Verdigris) On Skaro, the Master forged an alliance with the Daleks, acting as their agent to provoke warfare between the Earth Empire and the Draconian Empire in the 26th century. To achieve this, he employed a force of Ogrons who, through the use of hypnosound, made themselves appear human or Draconian, thus provoking the other side. When the Doctor revealed the true perpetrators, the plot was abandoned. (TV: Frontier in Space)

Returning to Earth, the Master set up a talent show called Make a Star, based on the anagram AKA Master, which he used to disrupt the timeline by making the contestants cover songs that weren't yet written. He intended to use the relatively minor disruption caused to allow him to take control of Earth, but this plan was foiled by the Doctor. (PROSE: Hidden Talent)

On another occasion, the Master made a deal with the Odobenidans to help them invade Earth, but accidentally trapped both them and himself in a time loop whilst undertaking some temporal mechanics on their behalf. He was trapped in the time loop beneath Greece for months. The Doctor, sent to Greece by the Time Lords to deal with the time loop, released the Master and foiled his plan again. (PROSE: The Seismologist's Story)

The Master planned to release a fog in Tadcaster by using Sarkan mist-flowers to generate a fog that would spread engulf the Earth in a dense fog. Attempting to catch up with the Master, the Doctor commandeered a pier train that crashed into the Master and the mist-flowers, sending all of them into the ocean, where the flowers were destroyed and the Master disappeared. (COMIC: Fogbound)

Reappearing again, the Master took control of the Brigadier's mind, and instructed him to kill the Doctor. However, the Brigadier attacked the Master, but he escaped, restoring the Brigadier to his senses. (PROSE: Smash Hit)

The Master travelled to the Land of Fiction, where he intended to steal an advanced piece of technology from the Land, and defeated Professor Moriarty. (COMIC: Character Assassin)

The Master used time-displaced Scottish warriors to seize a nuclear submarine and threaten Britain with obliteration if he wasn't given the Doctor's TARDIS; he ended up temporarily trapped in the 18th century. (COMIC: The Glen of Sleeping) He also worked with the Gaderene race to conquer Earth. (PROSE: Last of the Gaderene)

For a short while, the Master adopted the identity of "Duke Dominus", a gangster on early 20th century Earth, but his plan on was foiled by the Fourth Doctor without either the Doctor or the Master realizing the others' involvement. (PROSE: The Duke of Dominoes)

The Master went under cover on Earth following the 22nd century Dalek invasion and killed David Campbell, the husband of the Doctor's granddaughter Susan. After being defeated by the Eighth Doctor, he fled in his TARDIS, taking Susan with him as a hostage, unaware of her Gallifreyan heritage. As his TARDIS materialised on Tersurus, she used his TARDIS's telepathic circuits to attack him, forcing him out onto the planet's surface. She used his own Tissue Compression Eliminator against him while he was holding the Dalek's matter transmuter. The blast severely deformed and nearly killed him. Susan departed in his TARDIS; this brief materialisation, however, alerted the Time Lords to the Master's presence on Tersurus. (PROSE: Legacy of the Daleks)

A body in decay
Investigating the materialisation of an unauthorised TARDIS, (PROSE: Legacy of the Daleks) the Time Lord Chancellor Goth arrived on Tersurus, where he found the Master in a wasted condition — that of a decaying animated corpse. (TV: The Deadly Assassin) The Master sensed that Goth wished for power and offered it to him, whilst Goth, seeing the Master as a dying "creature," thought he could control the Master for his own means. (PROSE: Legacy of the Daleks) The Master made Goth, in line for the position of Lord President of the High Council of Time Lords, into his slave, continuing to promise him power, until Goth could no longer fight his mental dominance. (TV: The Deadly Assassin)

Whilst on Gallifrey, the Master also took over the Matrix, and realised that the Eye of Harmony resided beneath the Panopticon. He believed he could use the Sash of Rassilon to protect himself from the raw power of the Eye and channel that energy to renew himself.

With a telepathic summons and a vision of the future created by the Matrix, the Master lured the Fourth Doctor to Gallifrey, seemingly to prevent the murder of the then-serving Lord President. The Doctor failed and ended up on trial for the President's murder.

After Goth died, the Doctor defeated the Master in physical combat and, as a result, the Master fell into a crevice created by a localised earthquake. He gained access to his TARDIS in the confusion and escaped, (TV: The Deadly Assassin) having been able to convert the energy from the Eye of Harmony and partially heal himself. (AUDIO: Trail of the White Worm)

Immediately after leaving Gallifrey, the Master attempted to rend asunder the constellation of Mandus using a segment of the Key to Time, (PROSE: Cold Fusion) was captured by the Sild, (PROSE: Harvest of Time) entered a pact with the Embodiment of Gris, (PROSE: Cold Fusion) and, with his TARDIS still in the form of a clock, tried to steal Iris Wildthyme's body. (PROSE: The Scarlet Shadow)

Still looking a little "putrescent", (COMIC: The Abominable Showmen) the Master was greeted by a who had developed a plan to form a band to hypnotize viewers of The Battle of the Bands Beyond the Stars. , and  all joined in the plan, and the team spent "decades" practising. (COMIC: The Five Masters) After unveiling their presence to the Twelfth Doctor and Clara Oswald, (COMIC: The Abominable Showmen) the Masters prepared for their performance. However, the "Tremas" Master began to fight with Missy over the control of her device, believing that he alone could hold the universe in his grasp. The decaying Master joined in the struggle, declaring that his future selves were idiots. The five were quickly disqualified, seemingly destroying them. (COMIC: The Five Masters)

The Master plotted to capture the Z-battery that the Doctor left on Earth to repair his TARDIS during his exile. The Master's plan was to use the Z-radiation within the battery, combined with the O-radiation which permeated Oseidon, to create powerful ZO-radiation which the Master could use to renew himself. For his plot, the Master entered into an alliance with the Kraals, and created two robot duplicates; one to pose as Kraal Chief Scientist Tyngworg, (AUDIO: The Oseidon Adventure) and a second to search for genetically engineered alien worm in Derbyshire. (AUDIO: Trail of the White Worm) The Doctor defeated the Master by using a Master android duplicate he had constructed to kidnap the real Master, and take him away in his own TARDIS, before his plan could be fulfilled. (AUDIO: The Oseidon Adventure)

Discovering that the Celestial Intervention Agency were gathering illegal Vess weapons, the Master blackmailed their agent, Straxus, into handing over a Conceptual bomb. The Master then visited Bob Dovie and, after killing his family, planned the device into his head. When Dovie saw the Fifth Doctor's TARDIS, his refusal to believe in it caused the Doctor's TARDIS to explode, causing its timeline to begin to collapse. With the Doctor's timeline collapsing along with the TARDIS's, the Doctor's first eight incarnations joined forces to avert the detonation of the bomb, before the First Doctor erased the events from history. (AUDIO: The Light at the End)

The Master then posed as Inspector Efendi of the Intergalactic insurance agency so that he could find spaceships full of gold bullion. He then employed the Salonu to steal this gold, which attracted the attention of the Doctor and Leela to investigate. The Master then used the telepathic abilities of the Salonu to influence Leela into thinking that she was the Master's assassin, and that he was the great Xoanon who desired the death of the Doctor. The Salonu Prime, with the help of the Doctor, noticed the Master's influence and undid the conditioning. (AUDIO: The Evil One)

Shandar of the Rocket Men invited the Master on his ship The Asteroid, where the Master saw the Doctor was Shandar's prisioner. When he confronted the Doctor, the Master used his Tissue Compression Eliminator on him, and apparently killed him, but seen realized he had only destroyed a duplicate, the real Doctor was in fact pretending to be Oskin, and used that guise to bring down the force field around the ship, and used K9 Mark I to stall the Master's TARDIS once it had passed the force field so that the slaves on board the Asteroid could be freed. The Master overrode K9's tampering and kidnapped Leela after she had left the Doctor. (AUDIO: Requiem for the Rocket Men) The Master then used Leela to be his champion at the death match, where She used her skills to win. The Doctor tracked her down to the death match and managed to destroy it. (AUDIO: Death Match)

On Kendrax, the Master attempted to ally himself with the Daleks and the Cybermen, but his plan was foiled by Romana. (PROSE: The Not-So-Sinister Sponge)

The Master was drawn to and became stranded on the planet Traken, the centre of the Traken Union, in a TARDIS configured into the sculpture-shaped Melkur. He plotted to take over the Source also located on the planet Traken, the power behind the Traken Union, and use it to restore himself. To this end, over a period of years, he won over Kassia, who later married Tremas and became a stepmother to Nyssa. His plans were thwarted by the Fourth Doctor and Adric when the Keeper of Traken summoned them, having sensed something of his machinations. With the help of Tremas and Nyssa, the Doctor removed the Master from the Source.

However, with some of the Keeper's powers lingering, the Master merged with Tremas, stealing his body. (TV: The Keeper of Traken)

Besting the Fourth Doctor
In his new body, the Master went to Earth, where he trapped the Doctor's TARDIS in a gravity bubble. He killed Tegan Jovanka's aunt Vanessa and a police constable with his Tissue Compression Eliminator. He then went to Logopolis, where he pretended to be Tremas to gain Nyssa's cooperation, giving her a bracelet that allowed him to control her arm. Using her as a hostage, he perverted the Block Transfer Computations and held the planet for ransom until its secret was revealed. This made the causal nexus unravel and also broke the Logopolitans' blockade of entropy, allowing it to swallow several galaxies, including the entire Traken Union.

The entropy wave was so threatening that the Master agreed to work with the Doctor to stop it. They travelled to the Pharos Project on Earth to do so, using the last theorem of Logopolis to reopen Charged Vacuum Emboitments. His true plan was revealed however, when he sent a message to the peoples of the universe that he would stop the entropy only if they submitted to his rule. While the Doctor stopped the Master's signal to shut down the CVE that would halt the entropy wave, the Master caused him to fall off the Pharos Project's radio telescope and regenerate, allowing the Master to escape. (TV: Logopolis)

Battling the Fifth Doctor
As the Fifth Doctor made his leave in the TARDIS, the Master reappeared and kidnapped Adric and held him in a hadron web to make him a part of his TARDIS. Using a projection of Adric on board the TARDIS, the Master sent the Doctor's TARDIS hurtling to destruction at Event One, but the Doctor saved his TARDIS through the Architectural Configuration. The Master used Adric's block transfer computations to create Castrovalva in the Andromeda Galaxy, where the Doctor would recover from his regeneration. He escaped from the recursion trap and tried to kill the Doctor, but was attacked by the enraged citizens with the city itself due to collapse. (TV: Castrovalva)

The Master remained trapped Castrovalva for some time, but was able to find a way to project himself in England in the 1920s. In an attempt to capture and kill the Doctor and his companions and escape Castrovalva, thee Master manipulated Harry Houdini to send a psionic distress call to his old friend. When the Doctor answered the call, Houdini claimed that he needed help to stop a fortune teller. However, when the Master's plan was uncovered, the Doctor managed to stop his enemy's revenge plan. (AUDIO: Smoke and Mirrors)

The Master eventually escaped from Castrovalva, (TV: Time-Flight) but in the attempt, it caused damage to the dynamorphic generators, making it difficult to continue piloting his TARDIS. (PROSE: The Quantum Archangel) He travelled to Earth in 140,000,000 BC, where he disguised himself as the magician Kalid, hoping to use the Xeraphin gestalt to replace his dynamorphic generators. He brought two Concordes to his Citadel via a time contour. The second held the Doctor, his TARDIS and companions. He originally planned to use the captured passengers to break into the Sanctum and take control of the Xeraphin and add him to his TARDIS, but then he acquired the Doctor's TARDIS in a trade with him for a part the Doctor needed for his own TARDIS. The Xeraphin contacted Nyssa and let Tegan and her enter the Citadel, where the Master revealed his true form. The Master held the passengers hostage for parts from the Doctor's TARDIS. The second Concorde was returned to its own time and the Master ended up on Xeriphas with the freed and angry Xeraphin. (TV: Time-Flight)

On Xeriphas, the Master found and acquired Kamelion, a shape-changing android that could be easily controlled by a strong mind. Managing to elude Xeraphin, the Master escaped to England in 1215. He disguised himself as the French knight "Sir Giles Estram" and made Kamelion impersonate John of England to prevent the signing of Magna Carta. However, the arrival of the Doctor caused interference with his plans. After the Doctor defeated him in a joust, the Master fled in his TARDIS after the still-disguised Kamelion offered the Doctor the choice of saving him or another captive. (TV: The King's Demons)

When the High Council of the Time Lords discovered that various incarnations of the Doctor had been taken into the Death Zone on Gallifrey, they asked the Master for help and offered him a new cycle of regenerations as a bargaining tool. He agreed and was given a copy of the Seal of the High Council by the Castellan to prove his credentials. However, the Third Doctor did not believe the Master and took the seal from him on the pretense that he would return the "stolen property" to the High Council.

When the Fifth Doctor also disbelieved the Master, he made a temporary alliance with the Cybermen to guide them to the Dark Tower. After he let the Towers traps slaughter the Cybermen, he informed the First Doctor how to get past security, but then grew power-hungry at the mention of immortality. Brigadier Lethbridge-Stewart knocked him unconscious and Sarah Jane Smith and Tegan Jovanka bound him with rope. After Borusa was encased in Rassilon's tomb, Rassilon sent the Master back to his own time. (TV: The Five Doctors)

As an attempt to trap the Doctor, and steal his remaining regenerations, the Master faked his own death, ensuring the Doctor would attend the funeral at the nursing home where he supposedly spent his final days. But the Doctor was saved by Turlough, and the Master's plan was foiled yet again. (PROSE: The Velvet Dark)

The Master arrived in Camelot just after the coronation of King Arthur, and became the new Merlin after the old one died. He planned to make Arthur believe Mordred was dead so Mordred would grow up to kill Arthur at the battle of Camlan. When the Master saw that the Doctor and Tegan had arrived, he left the court and hurried to his TARDIS to retreat, while the Doctor suggested Arthur create the Knights of the Round Table to prepare for when Mordred came. (PROSE: The Creation of Camelot)

The Master developed a more powerful version of the Tissue Compression Eliminator and accidentally shrank himself and his lab, without the ill effect of death. Using a device to boast his telepathy, the Master made contact with Kamelion once more, directing him to use the Doctor's TARDIS to land on Sarn. With Kamelion acting as his physical proxy, the Master had him pretend to be the locals' god and order the Doctor's death. When this failed, he had Kamelion take the small box his lab had become and take it to the lab on Sarn that used Numismaton Gas, hoping it could restore him.

As the Master stood in a gas vent and returned to normal size, the Doctor used the gas to apparently burn him to death. (TV: Planet of Fire) However, the Numismaton Gas increased the power of the Source of Traken still remaining in the Master's body, enabling the Master to survive. (PROSE: The Quantum Archangel) Horrifically burned, the Master went in search of the Fountain of Youth to restore himself. (PROSE: A Town Called Eternity)

Using his link to Kamelion, the Master attempted to psychically interfere with the Doctor's fifth regeneration, (AUDIO: Winter) urging the Doctor to die from the spectrox toxaemia poisoning in the TARDIS, (TV: The Caves of Androzani) but was foiled by Nyssa. (AUDIO: Winter)

Encountering the Sixth Doctor
The Master allied with his old Academy schoolmate the Rani in Killingworth against the Sixth Doctor and Peri Brown; the Master hoped to hasten the advancement of Earth's technology for his own nefarious reasons, while the Rani wanted the brain chemical that induced sleep in humans. The Doctor trapped the Master and the Rani in the Rani's TARDIS, which the Doctor had sabotaged, with the time spillage putting them in danger of being eaten by a tyrannosaurus rex. (TV: The Mark of the Rani) The Master separated the Rani's console room from the rest of her TARDIS, freeing himself while leaving the Rani to drift aimlessly through the vortex. (PROSE: State of Change)

Recovering his own TARDIS and learning of the Valeyard, the Master materialised in the Matrix and observed the Doctor's trial on Space Station Zenobia while examining the Matrix footage himself to see what was tampered with. Learning that the Valeyard was an "amalgamation of the darker side of the Doctor's nature", the Master decided that the Valeyard a threat to himself and rescued the Doctor by supplying the Doctor with witnesses in the form of Melanie Bush and Sabalom Glitz, and revealing himself to the court as a surprise witness. Using Glitz as a tool, the Master tried to steal secrets from the Matrix, but was beaten by the Valeyard, and imprisoned in the Matrix with a limbo atrophier. (TV: The Ultimate Foe) The Time Lords released the Master from the Matrix, whereupon the Master killed the technicians and fled in his TARDIS. (PROSE: Mission: Impractical) After escaping, the Master could regenerate his body because the Source of Traken still existed within him. (PROSE: The Quantum Archangel)

After his scheme to replace William Shakespeare in history with Christopher Marlowe failed, (PROSE: Master Faustus) the Master was greeted by a who had developed a plan to form a band to hypnotize viewers of The Battle of the Bands Beyond the Stars. , and  all joined in the plan, and the team spent "decades" practising. (COMIC: The Five Masters) After unveiling their presence to the Twelfth Doctor and Clara Oswald, (COMIC: The Abominable Showmen) the Masters prepared for their performance. However, this Master began to fight with Missy over the possession of her device, believing that he alone could hold the universe in his grasp. The other incarnations joined in the fight, and the five were eventually disqualified, seemingly destroying them. (COMIC: The Five Masters)

After escaping from an unsuccessful alliance with the Krotons, the Master was attacked by the Chronovores looking for revenge for his torture of Kronos, and discovered that the last remnants of the Source of Traken were fading, reducing him to his previous cadaverous form would return. The Master devised a plan to destroy the Chronovores and achieve omnipotence by trying to access the Lux Aeterna using the son of TOMTIT, the TITAN Array. He stole the equipment and used it upon a woman he hypnotised, Anjeliqua Whitefriar, expecting it to destroy her before he used it. However, she absorbed the Lux Aeterna, achieved omnipotence and became the Quantum Archangel.

Using her power, she filled the universe with too many alternate timelines, leading the Chronovores to feast upon them, eventually leading to the end of the universe. The Master and the Doctor teamed up to rectify the Master's mistake by defeating the Quantum Archangel. They discovered that the Quantum Archangel had allied itself with the Mad Mind of Bophemeral so it could have infinite knowledge of the Universe. The Doctor and the Master encountered Kronos, who claimed to have been the one who attacked the Master's TARDIS, so he would come up with his plan, and would eventually lead to the Master's destruction as well as allowing Anjeliqua to survive, causing Kronos' plan for revenge to go wrong. They succeeded by draining the Lux Aeterna out of her, although not before the Master escaped using the TITAN equipment to harness the Lux Aeterna to restore his Trakenite body. (PROSE: The Quantum Archangel)

At some point he discovered the Parallel Sect, where he discovered The Valeyard. He possessed the body of Keith Potter. He encountered the Sixth Doctor. He wanted to use the dimensional nexus to dominate them all. (AUDIO: The End of the Line)

Facing the Seventh Doctor
After trying to start a war between Antari Two and Antari Three, (PROSE: First Frontier) the Master went to the Cheetah World, where he took control of the Cheetah People and the kitlings. He sent them to Ace's home in the London suburb of Perivale and hunted for human recruits. At the same time, exposure to the planet was changing the Master himself into a Cheetah Person. He found a pliable young man called Midge and used him to escape.

Using Midge as his "hunting dog", the Master recruited a gang of Perivale youths to defeat the Seventh Doctor and Ace. The Master killed Midge and teleported the Doctor to the Cheetah World, which had begun to break up. The Doctor escaped, but the Master was trapped on the dying world. (TV: Survival)

After Cheetah World
How exactly the Master escaped the Cheetah World and what occurred next was a matter of debate. Two competing solutions existed.

Finding a new regenerative cycle in the past

 * According to one source, the Master's time on the Cheetah World concluded the long period he had gone without regenerative powers.

The Master escaped from Cheetah World with the aid of a Kitling, just as the planet exploded. The explosion of the planet sent him back in time to Earth in 1957.

Trapped on Earth at the dawn of the Space Age, the Master interrupted the first Soviet satellite launch and sent a distress signal to the Tzun Canton on Zeta Reticuli Four. He offered to help assimilate Earth into the Tzun Confederacy. In return, the Master asked for passage off Earth and the use of the Tzun's genetic engineering to cure his Cheetah Virus infection. The Tzun accepted and prepared nanites for him that broke down the corrupted Trakenite DNA in his cells and restructured it. This restored the Master to being a "full" Time Lord, which gave him a new regenerative cycle. While assisting the Tzun, the Master used the alias "Major Kreer". Shortly after being restored to his full Time Lord heritage he was shot in the back by Ace, causing him to regenerate.

Following the regeneration he was able to make his escape, summoning his TARDIS using a Stattenheim remote control built from Tzun technology. After leaving a booby-trap for the Seventh Doctor in a nuclear warhead, the Master fled. (PROSE: First Frontier)

Later, the Master laid a trap for the Doctor in one of the Doctor's homes using a device which would release the energy from a time fissure once the Doctor's TARDIS materialised. This would destroy it. The plan failed when Sarah Jane Smith, Mike Yates and K9 destroyed the device, causing the Master to flee. (PROSE: Housewarming)

The nanites the Tzun gave the Master eventually began to fail, causing him to seek the Loom of Rassilon's Mouse in order to make himself a new body. The plan failed and the Master managed to escape by hypnotising Kitai into posing as a decoy. (PROSE: Happy Endings)

Tremas persists

 * Many sources held that the Master, still in Tremas's body, somehow escaped the Cheetah World, and that he apparently remained infected by the Cheetah Virus for quite some time.

On Earth, the Master tried to cure the virus by extracting nutrients from dying humans. (PROSE: Stop the Pigeon) He then attempted to gain a new body from the legendary race known as the Fleshsmiths. His plan was stopped by the Doctor, who ejected the new body from the Fleshsmith vessel into space. (PROSE: Prime Time)

No longer affected by the virus, the Master tried to steal the body of a boy named Callum, but was foiled by the Doctor. (PROSE: Omegamorphosis)

The Master met Adam Mitchell, a companion who had betrayed the Ninth Doctor, and began working to help him defeat their common enemy.

They set up an asylum in 7214 with Autons as staff as a trap for the Sixth Doctor, Peri and Frobisher. The Doctor broke out of his cell thanks to Peri and Frobisher and melted the Autons. The Master escaped by tripping up the Doctor, leaving Adam to capture Frobisher, who was disguised as Peri.

Using a group of Aeroliths to further his alliance, the Master syphoned their life force, to transmit to Adam, using a Gulwort. However, when they were freed by the Seventh Doctor, they chased after him.

After being tortured by the Aeroliths, the Master escaped, and, reunited with Adam, encountered the Eleventh Doctor. Preventing Adam from listening to the Doctor, the Master elected to kill the captured companions, but was prevented when the Doctor summoned his earlier incarnations.

The Master and Adam released an Auton army, but the Doctors defeated them and released their companions. However, unbeknownst to Adam, the Master planned to destroy reality itself, using the merged TARDIS that brought the Doctors there. Convinced by the Doctors, Adam stunned him, but the Master stabbed him with a hidden knife. The injured Adam managed to foil the Master's plan, but died in the attempt. The Master, still pleased by his role within all the chaos, teleported away. (COMIC: Prisoners of Time)

The Master captured the first seven of the Doctor's incarnations and put them into a void called the Determinant. The Graak freed the Doctors and the Master was captured and imprisoned by one of the races involved in his game. (GAME: Destiny of the Doctors)

Tremas lost
The Master learned of a device known as the Warp Core, a sentient powerhouse of mental energy designed as a weapon to safeguard the planet Duchamp 331. He tracked the Warp Core to Earth, intending to use it to power his TARDIS. Unprepared for its power and underestimating its outside awareness, he was attacked by the Warp Core, having the body he stole from Tremas stripped from him and reducing him to his previous decaying form. He then collected four Krill eggs with the intention of awakening the Warp Core from its slumber and exhausting it, so that he could draw it into his TARDIS to be his slave. The Master then used a mask to disguise his deformity and followed the Warp Core as it arrived on Duchamp 331. Under the alias Mr. Seta, the Master funded Madame Salvadori's trip to Duchamp 331.

There, he unleashed the Krill upon the passengers, hypnotising Salvadori's aide, Klemp, in the process. Revealing his true identity, the Master kept Salvadori alive, before encountering the Doctor. When the Core arrived, the Master tried to ally with it, but it dismissed him, leading his to ordering Klemp to kill Salvadori, but Klemp's loyalty was too strong, so the Master killed him. The Doctor escaped to his TARDIS, and attempted to gain control of the Warp Core through his TARDIS's telepathic circuits, while the Master used his own to fight of the Doctor's influence, and gain control of it. After it and the planet was destroyed, the Master was flung through time and space. (AUDIO: Dust Breeding)

The Doctor later made a deal with Death whereby the Master would have ten years of peace and sanity, at the end of which the Doctor had to kill him.

During his ten years, the Master had become a physician on the colony world of Perfugium with no memory of his past, and took the name John Smith. He was taken in by Wolstonecroft, and inherited his house when Wolstonecroft died. During his time as John Smith, the Master had become emotionally involved with Jacqueline Schaeffer.

At the end of the allotted time, the Doctor arrived, but strove to avoid fulfilling his side of the bargain. The Master became aware of the Doctor's role in pledging him to Death as her servant, but forgave him for it. Death herself was present, disguised as the Master's maid, and manipulated events so that the John Smith persona would crumble and the true Master would become dominant once more. (AUDIO: Master)

Fighting the Eighth Doctor
The Master, then in his "final incarnation", (TV: Doctor Who) arrived in the Valley of the Kings in Egypt, and was captured by the Daleks to be placed on trial, his TARDIS left behind in the tomb. (AUDIO: Mastermind) After he was tried and executed by the Daleks on Skaro as part of a Time Lord-Dalek treaty, (PROSE: Lungbarrow) the Master's last request was for the Doctor to transport his remains back to Gallifrey. However, his essence survived in a fluid-like form (TV: Doctor Who) that was known as a Deathworm Morphant. (AUDIO: Mastermind)

The Doctor stored the ashes in a casket and set his TARDIS on course for Gallifrey. En route, the Master, whose consciousness had survived the death of his physical body, escaped from the casket and interfered with the TARDIS, causing a timing malfunction. The ship materialised in San Francisco during the final days of 1999.

On exiting the TARDIS, the Doctor was caught in a crossfire of a gang war and was picked up by an ambulance. As the Doctor lay wounded, the Master exited the TARDIS via its keyhole, and hid inside a bag belonging to Bruce, the ambulance driver attending to the Doctor. After Bruce had gone to home and bed, the Master forced his way into Bruce's body through his mouth, killing him and taking over his body. The next morning, the Master awoke, now inhabiting Bruce's body, but realised that the American's body had started decaying and would not last long and launched his scheme to steal the Doctor's remaining regenerations. His first act was to kill Bruce's wife.

The Master befriended Chang Lee, a young gang member who had been present when the Doctor was shot, and who had stolen the TARDIS key. Having entered the TARDIS already, the Master regaled Lee with stories of the Doctor's supposed villainy, claiming that the Doctor had stolen the Master's regenerations. As part of his plan to take the Doctor's lives, he intended to open the Eye of Harmony, destroying the Earth in the process. With Lee's help, he was able to open the Eye. He discovered that the Doctor had regenerated into a new form, and that the Doctor was half-human.

The Master tracked the Doctor down, pretending to be Bruce, and agreed to take the Doctor and Dr. Grace Holloway to Professor Wagg's atomic clock at the Institute for Technological Advancement and Research, to which Grace was a member of the board of trustees, and repair the timing malfunction the Master caused with the clock's beryllium chip, when he was really planning to bring the Doctor back to the TARDIS. Realising the Master's true identity, the Doctor escaped, but before he could do so, the Master secretly possessed Grace's mind. When the Doctor got back to the TARDIS to fix the timing malfunction, the Master had Grace knock the Doctor out and put him in restraints. (TV: Doctor Who)

Still wearing Bruce's clothes, (COMIC: The Abominable Showmen) the Master was greeted by a who had developed a plan to form a band to hypnotize viewers of The Battle of the Bands Beyond the Stars. , and  all joined in the plan, and the team spent "decades" practising. (COMIC: The Five Masters) After unveiling their presence to the Twelfth Doctor and Clara Oswald, (COMIC: The Abominable Showmen) the Masters prepared for their performance. However, the "Tremas" Master began to fight with Missy over the control of her device, believing that he alone could hold the universe in his grasp. The decaying Master joined in the struggle, followed rapidly by the "Bruce" Master, and the group soon became involved in a full on brawl. The five were quickly disqualified, seemingly destroying them. (COMIC: The Five Masters)

Havng donned more traditional Gallifreyan robes, the Master boasted his plans to the retrained Doctor, accidently letting it slip that he had lost his lives trying to destroy the Doctor, exposing his earlier lies to Lee. After killing Lee for refusing to follow his orders, the Master forcibly opened the Eye using Grace's retina so that he could steal the Doctor's regenerations.

Although the Master was able to initiate the transfer process that would give him access to the Doctor's remaining regenerations, Grace was able to prevent this by rerouting the TARDIS' power and sending the ship into a temporal orbit. Grace released the Doctor from his restraints, but the Master threw Grace off of a balcony inside the Cloister Room, killing her. With the Master's body dying as the Doctor's regenerations were returned to him, the two Time Lords fought near the Eye of Harmony, culminating in the Master falling into it when he leapt at the Doctor and misjudged the angle. (TV: Doctor Who)

Imprisonment
Shortly after his defeat, the Master laid a final trap for the Doctor, leaving a crystalline structure on the Eye that would give the Doctor amnesia. However, the Doctor was subconsciously guided by Rassilon to recover his memories, Rassilon helping him travel to various locations where the Doctor could make contact with his younger selves and regain his memories through telepathic contact, eventually being restored to normal. (PROSE: The Eight Doctors)

While his essence was left wandering the Time Vortex, (COMIC: The Glorious Dead) an "echo" of the Master remained imprisoned inside the Doctor's TARDIS and offered the Doctor advice through a portrait, (PROSE: Sometime Never...) a mirror, (PROSE: The Deadstone Memorial) and even the Eye of Harmony. (PROSE: The Gallifrey Chronicles) Whilst exploring the TARDIS, River Song thought she heard an American screaming from within the walls. (GAME: The Eternity Clock)

Fight for the Glory
One account claimed that after the Master passed through the Eye of Harmony, his essence was left wandering the Time Vortex. Nearing his ultimate destruction, he was rescued from the Vortex by a being named Esterath, the controller of the Glory, the focal point of the Omniverse. The Master was told that it was time for the Glory to gain another controller, but the power had to be fought for. The Master assumed that the battle would be between himself and his greatest foe, the Doctor.

After gliding over the many realities throughout the Omniversal Spectrum for what he described as seeming like centuries, the Master was resurrected into the body of a recently-deceased vagrant on the streets of 2001 Brixton. Some weeks afterwards, due to a symbiotic link he had formed with the Doctor's TARDIS when it consumed part of his essence after he passed through the Eye of Harmony, the Master was transported onto the Moon during one of the Doctor's adventures. The Master subsequently used this link to trail the Doctor for some time without his enemy suspecting. (COMIC: The Glorious Dead)

He was present in London during the crisis resulting from Grace Holloway's attempt to merge human and Time Lord DNA, but was using the alien DNA of a Morphant by mistake. He killed Duncan, an MI6 agent, with the TCE. (COMIC: The Fallen)

The Master later made contact with Sato Katsura, a Japanese samurai unwillingly rendered immortal as a result of his involvement in the Doctor's adventures. The embittered warrior became the Master's follower. At his behest, Sato adopted the identity of Cardinal Morningstar and became leader of the Church of the Glorious Dead, instigator of a holy war that altered the history of Earth, a planet now renamed "Dhakan".

The symbiotic link between the Doctor's TARDIS and the Master had also given the latter the ability to influence the flight of the TARDIS, which he used to send the craft to times and places which would weaken the Doctor's self-belief and confidence.

After revealing his plot to the Doctor, the Master won a swordfight with the Doctor by stabbing him, but then learned that the true battle for the Glory was between his companion, Sato, and the Doctor's, the Cyberman Kroton, of which Kroton was the victor. Amongst his first acts as controller of the Glory were to cleanse the TARDIS of the Master's influence and to place the Master somewhere that he could not escape. The Master declared he would survive and return. (COMIC: The Glorious Dead)

Edward Grainger's dreams
Another account had it that the Master eventually escaped through the Eye of Harmony by influencing the dreams of Edward Grainger to unravel the Doctor's timeline, by killing Edward Grainger whilst he was an infant in 1906. (PROSE: Forgotten) However, the Master, in the body of Sir George Steer, was stopped by an older Edward Grainger from 2006 and Violet after being hit with a rolling pin and being removed from the body he possessed. (PROSE: Prologue) The Master then managed to evade the Eighth Doctor's detection, and possessed the body of a human native named Richard. (PROSE: Forgotten)

Wandering the Earth
After possessing Richard, the Master killed Violet out of revenge. However, the Master discovered his possession had caused the host body to decay at an accelerated rate, so he was forced to steal more bodies to prolong his survival. Realising that the First World War was rapidly approaching, the Master decided to migrate to America to avoid the conflict, and boarded a ship to go there in 1912. Unfortunately, he had boarded the RMS Titanic, unaware of its eventual fate, and escaped in a lifeboat when it sank.

Arriving in New York City, the Master took possession of a member of the Hudson Dusters, quickly becoming the leader of the gang and calling himself "Don Maestro". After twenty years of living in his current body, he occupied the body of his host's son, Michael, and moved to Las Vegas where he owned a casino. He accumulated money to fund experiments towards the elongation of the lifespan of his host body. Fearing the eventual decay of his body, the Master used his money to buy a penthouse to isolate himself from infection. After years living in isolation, his host's son confronted him with the knowledge that he had possessed both his father and his grandfather in some way. He then trapped the Master in the penthouse.

After UNIT were alerted to the presence of penthouse, they discovered the Master in a comatose state. He was imprisoned in the UNIT Vault, awakening every five years for one hour, before returning to a coma. After fifteen years living in the Vault, the Master awoke for a third time, and was interrogated by UNIT officers Ruth Matheson and Charlie Sato. However, he managed to hypnotise both of them and escape his imprisonment. Discovering that UNIT had recovered his TARDIS from a sealed tomb in the Valley of the Kings, he used it to escape from the Vault. (AUDIO: Mastermind)

Preparing for War
The Master was rescued from "a predicament" and given a new lease of life (AUDIO: Eyes of the Master) by Coordinator Narvin, (AUDIO: The Death of Hope) to fight in the Last Great Time War, as the Time Lords believed him to be a perfect warrior, due to his savagery. (TV: The Sound of Drums) The Master presumed that the Time Lords were "softening him up for something". (AUDIO: Eyes of the Master)

Originally intending for him to fight against the Daleks, the Time Lords discovered that the Eminence posed a greater threat, and instructed the Master to use them to fight the Daleks. The Celestial Intervention Agency gave the Master all the information he needed for his mission, (AUDIO: Eyes of the Master) such as an update on the Doctor's activities. (AUDIO: Masterplan)

Impersonating the Doctor
The Master infiltrated a Time Lord base which contained the Node Stone, which was a product of dimension technology, developed by the Dimensioneers, and stole them. The Master attempted to control the dimensional energies using the Node Stone, by planting one of the Node Stones on the planet of the Tolians, to drain all the energy that was available. This was a way of drawing the Doctor to the Tolians' planet, so he could gain possession of the only other Node, which the Doctor had in his TARDIS. By manipulating the Tolians, he tricked the Doctor into re-supplying dimensional energy to the Tolians using his Node, which caused a catastrophic imbalance in dimensional energy, threatening the structure of reality itself.

The Master attempted to infiltrate UNIT by pretending to be a future incarnation of the Doctor, modelling his TARDIS on the police box exterior. He had to work alongside the UNIT scientific advisor, Elizabeth Klein, and work under the command of Colonel Lafayette. He assisted UNIT in defeating a number of interdimensional alien incursions, including the Mind Leeches, Lava Spiders, the Nexus and Skyheads.

When the Seventh Doctor and his companion, Raine Creevy, fell through a dimensional doorway caused by the dimensional instability, the Master stole the Doctor's Node Stone, and sent all the alien invaders back to their own dimensions, but not before he left with the Doctor in his TARDIS. It was at this point that the Master revealed his true identity, and his plan, which was to use the two Node Stones to add even more dimensional energy to the Tolians, so he could use them to conquer the Earth and other planets beyond. However, the Doctor managed to convince the leader of the Tolians, Arunzell, that the Master would betray his species. This gave the Doctor the opportunity to capture the Master, use the two Nodes to send the Tolians back to their own dimension, and then destroy both Node Stones, but not before the Master escaped during the ensuing chaos, intending to try his scheme all over again. (AUDIO:UNIT: Dominion)

The Eminence experiments
The Master travelled to the Nixyce system and stole a teleportation casket of the Eminence, integrating it into his TARDIS console. He then tried to use the casket to gain influence over the Eminence, and take control of its infinite warriors, calling them his "finite warriors". (AUDIO: Eyes of the Master) He saved Sally Armstrong from being hit by a taxi, recruited her, and began to work for the Ides Scientific Institute in the 1970s. (AUDIO: Time's Horizon) He tried to discover why some humans were immune to the Eminence's influence, and eliminate it so that the Daleks could not exploit it.

The Master encountered the Eighth Doctor in London, and the Doctor opened his link to the Eminence located in his mind, teaching it how to pilot a TARDIS. The Eminence then used the teleportation casket located in the Master's TARDIS to pilot it, taking the Master and Sally with it. The Master managed to isolate the Eminence inside his TARDIS through the telepathic circuits, and Sally expelled the Eminence into the Time Vortex.

The Master and Sally then kidnapped Molly O'Sullivan from her home in 107 Baker Street, (AUDIO: Eyes of the Master) and took her to a world on the edge of humanity's war with the Eminence. There, the Master ran an experiment, using the Retro-genitor particles in Molly to fight the Eminence's breath of forever. (AUDIO: The Death of Hope) The Master then destroyed Ramosa, kidnapping all of the planet's human colonists on board his TARDIS. (AUDIO: The Reviled) The Master infected the human colonists of Ramosa with retro-genitor particles, planning to expose them to the Eminence, and gain control of all of them using the fragment of the Eminence contained in his mind. (AUDIO: Masterplan)

The Master unleashed his plans for humanity on Earth. He allied himself with the Eminence and allowed them to conquer Earth. He subsequently activated the retro-genitor particles in the humans and asserted his psychic influence over them. The Doctor escaped the Master's clutches and helped a group of humans overcome the Master's influence and stop his plans. Whilst the Celestial Intervention Agency erased his work from history, the Master escaped in his TARDIS, which was disguised as a palm tree. (AUDIO: Rule of the Eminence)

Creating a new Dalek army
The Master later helped the Dalek Time Controller to create a new Dalek army, beginning with the Red Padoga. (AUDIO: The Monster of Montmartre)

When the Doctor absconded in time, the Master tried to help repair it, saying that part of his agreement with the Controller was that he would be given worlds. As the amount of humans was running out, he decided to start converting Sontarans into Daleks. Liv stole his Tissue Compression Eliminator, and then travelled with him to Moscow. He created a mutiny with the Daleks, knowing that the Time Controller would betray him. The Doctor stole his TARDIS, and left him stranded in a Dalek-Sontaran war. (AUDIO: Master of the Daleks)

Last Great Time War
During the Last Great Time War, after fighting the Supreme Dalek on the slopes of the Never Vault, (TV: The Witch's Familiar) the Master was present when the Dalek Emperor took control of the Cruciform. Frightened by the horror of the Time War, he ran away as far as he could, to the end of the universe, (TV: The Sound of Drums) where the Time Lords were forbidden to look. There, he used a chameleon arch to hide himself as a human named Yana. (TV: Utopia) Rassilon sent the War Doctor to find the Master, but the Doctor was unable to do so. (PROSE: Engines of War)

Under the chameleon arch
Physically human, Yana recalled that he was found on the coast of the Silver Devastation with only an "heirloom" fob watch. His memory of his past was that the watch could never keep time and that he was always late for things as a result. He believed that he spent his life moving from one refugee ship to another and all his life he heard the sound of drums every waking hour as if they were getting closer.

Yana retained the Master's brilliant intellect and ultimately became involved in the attempt to send the remnants of humanity to Utopia. He eventually became friends with another scientist, Chantho, who was thought to be the last of the Malmooth race. Together, they worked on the Utopia Project to convey the surviving humans from the planet Malcassairo to Utopia.

Yana met the Tenth Doctor, Jack Harkness and Martha Jones when they were rescued from the Futurekind. Overhearing conversation between the Doctor and Jack about things such as time travel, Daleks, and regeneration, Yana became visibly upset. Martha drew Yana's attention to the watch in his possession and, hearing voices that commanded and entreated him, Yana opened the watch and returned to his true identity.

The Master then locked the Doctor out of Yana's lab, and opened the gate keeping the Futurekind at bay, saying to a shocked Chanto that "as one door closes, another must open". After Chanto threatened him with a gun, the Master electrocuted her with a loose set of power cables, angered that she was never curious of the fob watch during their decades of working together, and left her for dead. However, Chantho used the last of her strength to pull a laser gun on the Master while his back was turned, and shot him in the chest before she died.

Fatally wounded, the Master slithered into the Doctor's TARDIS while the Doctor watched on, deadlock sealed to door shut to keep the Doctor out, and regenerated into a younger body. (TV: Utopia)

Post-regeneration
With his new body, the Master left the Doctor, Martha and Jack on the planet Malcassairo with Futurekind about to burst in the laboratory door. The Master now had the TARDIS and the Doctor's DNA template via the Doctor's hand, which Jack Harkness had taken with him to Malcassairo. (TV: Utopia)

Because of the Doctor's last-minute intervention, the TARDIS would only take the Master to Earth in the 2000s. He took on the alias "Harold Saxon" and set about fabricating Saxon's past to gain political support. He made his first public appearance shortly after the downfall of Harriet Jones. (TV: The Sound of Drums)

Life on Earth
"Harold Saxon" released his autobiography, Kiss Me, Kill Me, and, while writing the book, met the Honourable Lucy Cole, who was working in publishing; they were married in 2007. He also cannibalised and converted the Doctor's TARDIS into a paradox machine to change history, and took Lucy to see the Universe. (TV: The Sound of Drums)

Travelling back to the end of the universe, the Master contacted the Toclafane, the child-like, vicious cyborg remnants of the humans who had never found Utopia. He made an agreement to allow the Toclafane to escape extinction and live anew in the past, with the paradox machine preventing them from changing their own history. (TV: The Sound of Drums, Last of the Time Lords)

The Master designed the Valiant, UNIT's air carrier, and a laser screwdriver, which he reserved for his own use. The Master then started the Archangel Network, which was hailed as a telecommunications breakthrough. This telecommunications network, tied to mobile phones, carried a mind control signal which made humans trust him. The network affected the Doctor so he had no suspicions as to the Master's presence as "Harold Saxon", as he would have normally noticed the presence of another Time Lord. To those few humans conscious of it, the signal was a persistent drumbeat, the constant drumbeat the Master always heard, that only they could hear. (TV: The Sound of Drums)

Political career
By 2007, "Saxon" had become Minister of Defence of Great Britain, (TV: The Sound of Drums) and campaigned for the general election as Prime Minister of Great Britain (TV: Love & Monsters) with the slogan "Vote Saxon". (TV: Captain Jack Harkness) On Christmas Eve, he gave orders for British Army tanks to destroy the Empress of the Racnoss's webstar. (TV: The Runaway Bride)

The Master visited "Saxon's" old high school during the campaign, using the Archangel Network to brainwash the staff into having false memories of "Saxon" to gain political support. One teacher, James Curtis, was resistant to the Network, so the Master used his laser screwdriver to implant the appropriate memories into his mind. (PROSE: Speech Day)

"Saxon" asserted that extraterrestrial life did exist and Britain must do something about it. This made him popular in early 2008, after the Judoon had taken the Royal Hope Hospital to the Moon. (TV: Smith and Jones)

"Saxon" also funded the rejuvenation experiments of Richard Lazarus, presumably revealing at least in part the biological processes involved in a Time Lord's physical regeneration; its similarities were noted by the Doctor on observing the process. (TV: The Lazarus Experiment) With the results from this and the Doctor's DNA, the Master could use the laser screwdriver to age the Doctor. (TV: The Sound of Drums)

After Martha had left with the Doctor, "Saxon" had a mysterious man meet with Martha's mother, Francine, (TV: The Lazarus Experiment) and then had an agent tap into a conversation between Francine and Martha through the superphone. (TV: 42)

Before the Doctor, Martha and Captain Jack arrived back from the end of the universe, the Master had sent Torchwood Three on a wild-goose chase to the Himalayas, (TV: The Sound of Drums) and, along with all other incarnations of the Master, was kidnapped by the Sild. (PROSE: Harvest of Time)

With his election a sure thing, politicians from other parties flocked to his side. Harold Saxon was elected Prime Minister of the United Kingdom in May 2008, and visited Buckingham Palace soon after to give a victory speech. (TV: The Sound of Drums)

Prime Minister Saxon
He gathered his Cabinet for a meeting in the re-built 10 Downing Street, and accused them of being traitors for abandoning their political parties to jump on his political ticket. He rigged the desk phone speakers on the Cabinet Room table to release a lethal gas that killed the Cabinet ministers, while using a gas mask to protect himself and mock his victims. He later unleashed the Toclafane on Sunday Mirror reporter Vivien Rook, who threatened to expose his fabricated past to the public.

"Saxon" told the public that the Cabinet had gone into seclusion, and soon afterward announced first contact with the "friendly" Toclafane who could protect Earth against alien threats. The Master then had Francine, Tish and Clive Jones arrested and taken to the Valiant; Leo Jones, however, had received a warning from Martha and gotten away in time. After a telephone conversation with the Doctor, the Master had the Doctor, Martha and Jack framed as terrorists responsible for the Cabinet's murder and forced them into hiding.

The Master moved to the Valiant, which the governments of Earth considered neutral territory and therefore fitting for formal first contact with alien life. The Master had the Toclafane murder the American President Arthur Coleman Winters, and captured the Doctor, Martha and Jack, who had come to the Valiant earlier that day. Using the results from Professor Lazarus's experiment, along with the DNA in the Doctor's hand, the Master used his laser screwdriver to age the Doctor into an old man, and then ordered the Toclafane to kill one tenth of humanity and commence their invasion as Martha escaped. (TV: The Sound of Drums)

Master of all
While ruling the world for a year, the Master discovered that the Drast had secretly invaded before he arrived. Furious, he ordered the Toclafane to burn Japan, where the Drast were situated. (PROSE: The Story of Martha) By 2009, the Master had converted Earth into a slave camp which he ruled from the Valiant. The Master aged the Doctor even further and planned to expand his New Time Lord Empire into space. He built an army of warships to take his war across the universe.

Martha used the legend of the Doctor, which she had spread, and the thoughts of Earth thinking "Doctor" at the same time. Their psychic energy was channelled through the Archangel Network, which the Doctor had spent the year infiltrating telepathically. The psychic energy restored the Doctor and gave him telekinetic powers. After cowering from the Doctor's forgiveness, the Master used Jack's vortex manipulator to teleport him and the Doctor to Earth, where he threatened to use the Black hole converter to detonate the rockets, but was foiled by the Doctor's knowledge that the Master could not kill himself.

Jack destroyed the Paradox Machine and reversed time one year, although this did not affect anyone aboard the Valiant. Lucy shot the Master. Defeated, he refused to regenerate to spite the Doctor, and died in his arms. The Doctor burned the Master's body on a pyre, (TV: Last of the Time Lords) but, long after he had left, Miss Trefusis, one of the warders of Broadfell Prison, (TV: The End of Time) retrieved the Master's ring from his funeral pyre. (TV: Last of the Time Lords)

As far as the general public were aware, Harold Saxon "went mad" and disappeared, along with President Winters. (TV: The End of Time) Among all ex-Prime Ministers, Saxon was on file by UNIT, who noted him as one of the Master's incarnations. This was revealed to the Twelfth Doctor by Osgood when the Master returned as "Missy", commenting that "she wasn't even the worst." (TV: Death in Heaven) By the year 2119, Saxon was well-remembered enough that Alice O'Donnell, though admittedly a follower of the Doctor's exploits, referred to 1980 as "pre-Harold Saxon" when brought back to that year by the Twelfth Doctor. (TV: Before the Flood)

Resurrection
On Christmas Eve 2009, the prison governor of Broadfell Prison brought Lucy Saxon to a chamber where most of the staff were members of the Disciples of Saxon, who had been working ever since his apparent death to bring about his resurrection.

With the help of the ring and a biometric imprint taken from Lucy, the nude Master reappeared in a swirl of energy, but Lucy and one other warder had prepared for this. To stop his resurrection, Lucy hurled a Potion of Death at the Master. His followers and Lucy were killed in the resulting explosion, but the Master survived. (TV: The End of Time)

Survival
The Master survived the blast, but his physical form was flawed: his once brown hair was now bleached blond, and he was unshaven and unkempt. Also, his life force was left in a state of constant depletion. He consumed huge quantities of food and drained the vitality of humans to stay alive. As a side effect of the failed resurrection, he could expend his life force for enhanced agility and send bolts of energy from his hands. The Master's body would even fluctuate between a fleshy form and a half-skeletal state.

The Master led the Doctor on a wild goose chase after banging the beat of the drums in his mind to lure the Doctor to him and escaped when Wilfred Mott interrupted the chase. (TV: The End of Time)

At some point after his resurrection, the Master was greeted by a who had developed a plan to form a band to hypnotize viewers of The Battle of the Bands Beyond the Stars. , and  all joined in the plan, and the team spent "decades" practising. (COMIC: The Five Masters) Much to this Master's appreciation, he was allowed to play the drums. After unveiling their presence to the Twelfth Doctor and Clara Oswald, (COMIC: The Abominable Showmen) the Masters prepared for their performance. However, the "Tremas" Master began to fight with Missy over the control of her device, believing that he alone could hold the universe in his grasp. The other Masters soon joined in the fight for power as well, while the "Saxon" Master joined seemingly for the fun of it. The five were quickly disqualified, seemingly destroying them. (COMIC: The Five Masters)

Encountering the Tenth Doctor soon after, the Master and the Doctor discovered the drumming in the Master's head was real, not just a symptom of insanity. Billionaire Joshua Naismith then captured the Master and enlisted his assistance to mend the malfunctioning Vinvocci medical machine, which he had christened the "Immortality Gate". The Master co-operated for his own purposes. He broke out of a straitjacket and flew into the gateway, which he had working a billion fold on the human template. The gateway sent out an energy pulse that transformed every human on Earth, except Wilf and his granddaughter, Donna Noble, into the Master Race — identical copies of the Master subservient to him. (TV: The End of Time)

Rassilon's Final Solution
After the Doctor and Wilf were rescued from the Master by two Vinvocci, the Master used the combined mental powers of the Master Race and a White-Point Star that had fallen on Earth to trace the origin of the drum beat in his head. Receiving contact from the Time Lord High Council on the last day of the Time War, the Master tore open the time lock on the war, bringing back the Time Lords.

As the Lord President Rassilon and his council arrived through the Immortality Gate, the Master announced he intended to transplant himself into the entire Time Lord race, just as he had done to the human race. Rassilon, using his gauntlet, reversed the effects of the Master's transplantation, and watched as Gallifrey returned to the universe on a collision course with Earth.

Rassilon revealed his plans for the Ultimate Sanction, but the Doctor stepped in with Wilfred's pistol. After some hesitation on whether to shoot Rassilon or the Master, he shot the White-Point Star, destroying the link. Enraged, Rassilon prepared to kill the Doctor, but the Master unleashed his bio-electric blasts at the President, roaring that the Time Lords had manipulated him and made him the monster he had become, counting the beat of the rhythm that had resounded in his head and tormenting him all his life. The Time Lords, Gallifrey, and the Master then vanished in a burst of white light, and were sent "back into [the] hell" of the final day of the Time War. (TV: The End of Time)

A female body
At some point after his failed resurrection, the Master regenerated into a woman. As such, she adapted her name of "the Master" into "Missy", short for "Mistress". (TV: Dark Water) Evidently through precautions she herself would recommend to UNIT, she had regained the ability to regenerate. (TV: The Magician's Apprentice)

She managed to escape from the pocket universe in which Gallifrey existed. (TV: Death in Heaven) She also managed to acquire a vortex manipulator, which she used for time travel. (TV: The Magician's Apprentice)

3W Institute
Working with the Cybermen, Missy founded the 3W Institute, in order to create a Cyberman army of the dead. She uploaded dying minds to the Nethersphere; a virtual reality housed within a matrix data slice. This reality changed and rewrote the minds, removing their emotions before re-downloading them into their Cyber-converted bodies. (TV: Dark Water)

Stalking the Doctor
At some point before 2013, Missy gave Clara Oswald the Doctor's phone number, claiming that it was a tech support line, leading to Clara to meet the Eleventh Doctor. (TV: The Bells of Saint John, Death in Heaven) Missy kept the Doctor and Clara together into the Doctor's twelfth incarnation by placing an ad in a newspaper for Mancini's Family Restaurant, believing that Clara was just the right companion to attract the Doctor's interest and make it easier for Missy to manipulate him emotionally. (TV: Deep Breath, Death in Heaven)

Missy went along the Doctor's timeline and greeted people who died in connection with him, (TV: Death in Heaven) such as the Half-Face Man (TV: Deep Breath) and Gretchen Carlisle. (TV: Into the Dalek) Finding this "a bit busy", (TV: The Caretaker) Missy began to secretly monitor the Twelfth Doctor and Clara, (TV: Flatline) as she did when Earth was saved from a solar flare by a forest that grew overnight. (TV: In the Forest of the Night)

Reclaiming her friend
Missy finally met the Twelfth Doctor and Clara at one of 3W's mausoleums, which was hidden inside St Paul's Cathedral (TV: Dark Water) with dimensional engineering. (TV: Death in Heaven) Initially posing as an android and sharing a kiss with a very confused Doctor, she revealed her true identity to him as the Cybermen marched out onto the streets of London. (TV: Dark Water)

Missy was quickly captured by UNIT, having anonymously tipped them off on the Cybermen's presence. She watched as Cybermen flew into the sky exploded above major population centres, creating clouds that rained Cyber-pollen that turned the dead into Cybermen. She was taken onto Boat One along with the Doctor. She then sent out a signal to the Cybermen, who attacked the plane. Missy freed herself and disintegrated Osgood. Missy ordered the Cybermen to remove a piece of the fuselage, causing Kate Stewart and the Doctor to be sucked out. She then ordered the Cybermen to destroy the plane, and teleported away. In the Nethersphere, Missy and Seb watched the Doctor free falling. The Doctor saved himself by using his key to summon the TARDIS. When Seb got overexcited at this dramatic turn of events, Missy casually disintegrated him. The Doctor found out from the Cyber-converted Danny Pink that she planned to have the Cyber-pollen fall again, killing humanity, who would be reborn as Cybermen. She teleported into the graveyard to which the Doctor had piloted his TARDIS. Missy then unexpectedly gave the Doctor control of the Cybermen, wanting him to use them as his army, in the hopes of proving the similarities between the two Time Lords. However, after pondering the idea, the Doctor proclaimed himself to be simply an "idiot" with a box rather than a general or any sort of leader. He instead turned control over to the Cyber-converted Danny, who ordered the army into the sky to destroy themselves, dispersing the threatening rainclouds.

After the threat of the Cybermen had ended, Missy gave the Doctor coordinates to the current location of Gallifrey, lying to the Doctor that the planet had returned to its original location, and that she and the Doctor could travel there together. However, Clara, using Missy's own weapon, decided to kill her. The Doctor wouldn't let Clara kill Missy, decided to kill his old friend himself — not out of vengeance, he told her, but to save Clara's soul. Before he could fire the weapon, Missy was shot by a rogue Cyberman, who was revealed to be the Doctor's old friend, Brigadier Lethbridge-Stewart, (TV: Death in Heaven) but used the blast from the blaster to recharge her vortex manipulator and escape undetected. (TV: The Witch's Familiar)

Trapped on Skaro
Some time later, Missy re-emerged and got the attention of both Clara and UNIT by freezing all the airborne planes on Earth in time. Summoning Clara, she showed her the Doctor's confession dial, the Time Lord equivalent of a will. Together, she and Clara tracked the Doctor down to Essex in 1138.

Unbeknownst to them, they led Colony Sarff right to the Doctor. Sarff then took the three to Skaro, although they were led to believe that they were still in deep space. While the Doctor was taken to Davros, Missy and Clara escaped their cell, but were soon captured by a Dalek. They were taken to the other Daleks before they were both seemingly exterminated. (TV: The Magician's Apprentice) However, Missy had survived by using the Dalek blasts to recharge her vortex manipulator and teleporting from the Dalek city. Clara also survived this way.

Missy and Clara entered the Dalek sewers, composed of rotting Daleks. Missy used Clara to lure a Dalek there, then cut through its case using a brooch given to her by the Doctor made of dwarf star alloy, enabling the rotting Daleks to kill it. She then put Clara inside the case and pretended to be her prisoner, enabling her to re-enter the Dalek control room. When the Daleks began to gain Time Lord regeneration energy, Missy used their incapitation to find the Doctor. She used a Dalek gun to shoot Colony Sarff, saving the Doctor. She then watched as the Doctor toyed with Davros about the revived Daleks in the sewers and even tapped Davros' Dalek eye as they made their escape.

When the city was being destroyed by the regenerated sewer Daleks, Missy tried to trick the Doctor into killing Clara inside the Dalek. However, the Doctor realised the deception and told Missy to run. She was surrounded by Daleks when the city crumbled in on itself, but had "a really clever idea". (TV: The Witch's Familiar)

Uniting with past selves
Hearing that the Twelfth Doctor and Clara had been forced to enter Battle of the Bands Beyond the Stars, Missy came up with a new plan for universal domination. Travelling through her time stream, she recruited her, Tremas,  Bruce and , and formed a band to compete on the show. The group planned to use the popularity of the program to hypnotize the audiences across the galaxy. According to Missy, the five spent "decades" preparing for the performance. (COMIC: The Five Masters)

The group went on before Clara and the Doctor due to a shift in the program's schedule, and the five revealed themselves to the pair. (COMIC: The Abominable Showmen) Missy expected the Doctor to attempt to stop the five of them, or to at least esquire on their plans, but the Doctor refused to intervene or question their scheme. After much prying, the Doctor correctly predicted the group's plan, but still refused to intervene as they started their song.

As she prepared to hypnotize her audience, her previous incarnations began to fight with her over her device, as each wanted to control the universe without the others. During the fight, viewers began to turn off their sets and the group were soon all disqualified and were thus blown up, although neither Clara nor the Doctor believed that they had truly been killed. (COMIC: The Five Masters)

Alternative timelines
In one universe, the Master became a Magistrate for the High Council upon graduating the Time Lord Academy, and was still close friends with the Doctor. Over time, his devotion to justice and discipline devolved into an obsession with order which marked the beginning of his descent into darkness. (PROSE: The Infinity Doctors)

In a parallel universe, the Master was still a loyal Time Lord who went under the name Koschei. He was working for the Celestial Intervention Agency and travelled with a human companion called Ailla. (PROSE: The Face of the Enemy) They became stranded on Earth after defeating the Great Intelligence, and the Republic of Great Britain captured him for information. Ailla was killed and Koschei was tortured until all his regenerations were used up. Koschei died when he was confronted by the Master from N-Space, who turned off his life-support machine at his request. (PROSE: The Face of the Enemy)

In an alternative universe, the Master aided the Daleks in a war against the Time Lords. The war was being led by the Sixth Doctor, who was President of the Time Lords. Due to the aid of the Master, the enemy began winning the war. Rather than let them win the war, the Doctor activated the Armageddon Sapphire, which destroyed this universe and killed the Master. (PROSE: The Quantum Archangel)

In a different alternative universe, the Master cooperated alongside the Rani, the Monk and Drax to try to destroy the world using a DNA recombinator, turning the human race into a gestalt consciousness which could be used as a weapon to conquer the universe. (PROSE: The Quantum Archangel)

The Sild captured many different alternate versions of the Master. (PROSE: Harvest of Time)

Personality
The Master was the polar opposite of the Doctor in almost every respect; condescending, arrogant, vain, and lusting for power. (TV: Terror of the Autons, Colony in Space, The Sound of Drums) However, the Master's insanity was in part due to the High Council from Gallifrey's future sending a four-beat rhythm of drums into the Master's mind, (TV: The End of Time) with the Tenth Doctor recalling that staring into the Untempered Schism as a child caused the Master's personality to change. (TV: The Sound of Drums)

The Master had the ability to control his regenerations, with each face he selected baring the imprint of his mind, leading the Master the processes the same characteristic across various regenerations. (PROSE: Harvest of Time) Comfortable with his villainous reputation, the Master took insults about his madness as compliments, (TV: The Time Monster, The Five Doctors, The Sound of Drums) and reacted with offence if someone asked her if she had turned over a new leaf. (TV: The Magician's Apprentice)

When introducing himself, or enthralling someone, the Master would say, "I am the Master and you will obey me." He also liked to say "my dear Doctor" when addressing his adversary.

Unlike the Doctor, who usually needed his companions to convince people that he knew what he was doing, the Master had little problem manipulating people into helping him with his evil plans. (TV: The Time Monster, Doctor Who)

Extremely self-centered, the Master was willing to destroy Gallifrey to regenerate himself, (TV: The Deadly Assassin) believed that the battle for the Glory was to be between him and the Eighth Doctor, (COMIC: The Glorious Dead) thought that Carmen's prophesy referred exclusively to him, (TV: The End of Time) and viewed the Doctors saving Gallifrey as an attempt to save her. (TV: Death in Heaven)

The Master's schemes usually fell into three categories; conquest, (TV: Terror of the Autons, The Mind of Evil, Colony in Space, The Dæmons, The Time Monster, Logopolis, The Sound of Drums) survival, (TV: The Deadly Assassin, The Keeper of Traken, The Five Doctors, Planet of Fire, Survival, Doctor Who, The End of Time) and the death of the Doctor. (TV: Castrovalva, The Ultimate Foe) Similar to the Monk, the Master would also, on occasion, attempt to disturb the flow of history, (TV: The King's Demons, The Mark of the Rani) and, when imprisoned, would devote his energies to gaining his freedom. (TV: The Claws of Axos, The Sea Devils, Time-Flight, Utopia)

Throughout his lives, the Master would adopt many disguises and aliases, often to pursue his goals, (TV: Terror of the Autons, The Mind of Evil, Colony in Space, The Dæmons, The Time Monster, Frontier in Space, Castrovalva, The Sound of Drums) though other times with no reason or explanation given. (TV: Time-Flight, The Mark of the Rani)

The Master's disguises ranged from the providence of false qualifications, (TV: Terror of the Autons, The Mind of Evil, Colony in Space, The Dæmons, The Time Monster, Frontier in Space, The Sound of Drums) to employing masks and heavy makeup (TV: Terror of the Autons, The Mind of Evil, The Claws of Axos, Castrovalva, Time-Flight, The King's Demons) or a change of clothing, (TV: The Sea Devils, Logopolis, The Mark of the Rani) to even changing his physical forms. (TV: The Keeper of Traken, Utopia, Dark Water)

In a show of vanity, the Master's choice of alias would often reflect his title of "Master". (TV: Terror of the Autons, The Dæmons, The Time Monster, The King's Demons, Dark Water; PROSE: Doctor Who Fights Masterplan "Q" , Night Flight to Nowhere, The Time Savers, Legacy of the Daleks, Last of the Gaderene, The Quantum Archangel, The Duke of Dominoes, The Spear of Destiny; AUDIO: Dust Breeding, Trail of the White Worm, Mastermind, The Evil One)

High Council President Borusa described the Master as "one of the most evil and corrupt beings [the] Time Lord race [had] ever produced" and that his "crimes [were] without number, and [his] villainy without end." The Master seemed amused by the description.(TV: The Five Doctors)

The Master was referred to as a "jackanapes" and an "unimaginative plodder" by the Third Doctor, (TV: Terror of the Autons) the "quintessence of evil" by the Fourth Doctor, (TV: The Deadly Assassin) "pure evil" by the Eighth Doctor, (TV: Doctor Who) "stone-cold brilliant" by the Tenth Doctor, (TV: The End of Time) and the Time Lords' "most infamous child" by Time Lord founder Rassilon. (TV: The End of Time) )

Thirteenth incarnation
In his thirteenth incarnation, the Master was often arrogant and impatient, taken to be rude towards all and showing no tolerance for stupidity. (TV: The Dæmons, The Sea Devils, The Time Monster, Frontier in Space) To sway others to his way of thinking, the Master acted as a suave and debonair gentleman, with a sardonic sense of humour. (TV: Terror of the Autons, The Time Monster) When his own survival was at stake, the Master would not hesitate to betray his allies to save himself. (TV: The Claws of Axos)

The Master was willing to play the long game, spinning a web of lies while maintaining several back-ups in his schemes. (TV: The Mind of Evil) He seemed to truly believe his delusions of grandeur, proclaiming that he and the Doctor could "reign benevolently," ending "war, suffering [and] disease," (TV: Colony in Space) and that, instead of "all this talk of democracy, freedom, [and] liberty", the world needed "strength, power and decision." (TV: The Dæmons) When the Doctor accused him of being paranoid, the Master stated that everyone was paranoid, he was just honest about his paranoia. (TV: The Time Monster)

The Master held himself in high-esteem, even believing himself immune to the mind parasite within the Keller Machine, when in truth, he was only able to resist it's attack on him for a short time, and with great effort. (TV: The Mind of Evil) He also demonstrated a strong confidence in himself when he walked into the UNIT HQ on the edge of London without fear of capture, instead hypnotising a handful of UNIT personnel. (TV: The Claws of Axos)

This Master also had a juvenile side to him, making blithely sarcastic comments about an impending nuclear meltdown, (TV: The Claws of Axos) enjoying an episode of Clangers in his prison cell, (TV: The Sea Devils) and reading The War of the Worlds while trying to instigate a war between Earth and Draconia. (TV: Frontier in Space) He also had a sadistic side, taking particular pleasure in goading the Brigadier into attacking Axos when they both knew that it would put the Doctor and Jo Grant in danger. (TV: The Claws of Axos) He also took considerable delight in blackmailing the Doctor and Jo on Uxarieus. (TV: Colony in Space)

The Master often killed people, but saw murder as a regrettable necessity rather than a lifestyle choice. However, he would casually murder those whom he could not control, (TV: Terror of the Autons) or were standing in the way of an item he required. (TV: The Claws of Axos) He believed that those who died as a result of his schemes to be "necessary sacrifice[s]". (TV: The Sea Devils)

Unlike his following renditions, this Master was rarely resentful, instead accepting defeat with only a slight annoyance, (TV: The Dæmons, Frontier in Space) though he once stated that destroying the Doctor's favorite species would "be a reward in itself." (TV: The Sea Devils) Also unlike his succesors, this Master learned from his mistakes, placing an anti-intruder alarm beam in his TARDIS after the Doctor stole his dematerialisation circuit. (TV: Terror of the Autons, Colony in Space)

Being a haughty psychopath, he regarded most beings as his inferiors, but had a mutual respect for the Doctor as a worthy opponent and his near intellectual equal, (TV: Terror of the Autons, The Sea Devils) and even showed a certain respect to the Doctor's companions, even if he still considered them inferior. (TV: Frontier in Space) He often found himself unable to kill the Doctor, because that would rid him of the satisfaction of defeating him, (PROSE: Legacy of the Daleks) and would only resort to killing the Doctor if he viewed him as an unmovable obstacle in his plans, (TV: Terror of the Autons) considering his quarrel with the Doctor to be something of a game, though he was willing to risk the Doctor's life on the Keller Machine to satisfy his curiosity. (TV: The Mind of Evil) However, the Master was not above working alongside the Doctor when necessary, (TV: The Claws of Axos) and even offered to rule the universe with him. (TV: Colony in Space)

While in Atlantis, the Master formed a relationship of sorts with Queen Galleia, remarking that she was beautiful and promising her power. Both Galleia and Lakis commented that the Master had "the bearing of a God". (TV: The Time Monster)

During this incarnation, the Master would often smoke a cigar. (TV: The Mind of Evil, The Time Monster)

A master manipulator, the Master knew how to use others' greed and sense of duty as bargaining tools in his schemes, (TV: The Claws of Axos, The Sea Devils) and how to use his authority as an adjudicator to manipulate and influence the human factions and their competing aspirations on Uxarieus. (TV: Colony in Space)

The Master was also stronger than he appeared, as he was able to physically overpower Luigi Rossini, (TV: Terror of the Autons) Harry Mailer, (TV: The Mind of Evil) Smedley, (TV: The Sea Devils) and John Benton. (TV: The Time Monster) He was also able to make a small jump onto a moving lorry from a bridge, and then swing down to the driver's cab to hypnotise the driver. (TV: The Claws of Axos)

Degenerated body
Following his degeneration, the Master was mainly preoccupied with finding a way to regenerate. With his mobility and capabilities of camouflage decreased, he was often forced to hide his involvement in his plans until the very moment victory was within his grasp. (TV: The Deadly Assassin, The Keeper of Traken)

The Master felt a stronger hatred towards the Doctor than before, specifically guiding the Fourth Doctor back to Gallifrey so he could be framed for the President's assasination and executed in disgrace, (TV: The Deadly Assassin) and once hatched a plan that would have destroyed all the Doctors and unraveled the Web of Time simply for his revenge against the Doctor. (AUDIO: The Light at the End) Despite the animosity, the Master was able to have a civil conversation with the Doctor when it suited him. (AUDIO: Death Match)

Meticulous in his schemes, the degenerated Master planned for every imaginable obstacle and putting in place a counter for it. (AUDIO: Trail of the White Worm, The Oseidon Adventure) He was willing to be patient with his plans, waiting inside his TARDIS for years to slowly seduce Kassia. (TV: The Keeper of Traken)

While he claimed that nothing he ever did "[was] ever pointless", the Master seemed more comfortable with killing people just for the sake of it, (AUDIO: The Light at the End) showing a sadistic pleasure when he resorted to killing, (TV: The Keeper of Traken) and even destroyed the planet Raskalar for amusement. (AUDIO: Death Match)

In his degenerated state, the Master's telepathic capabilities and willpower grew stronger, with the Master proclaiming that "only [his] hate keep[ed] [him] alive". He was able to launch a telepathic message to the Doctor from Gallifrey to the Doctor's TARDIS, (TV: The Deadly Assassin) and, once he became the Keeper of Traken, the Master forced Tremas to kill Neman through sheer willpower, and also paralyzing the Doctor to make him watch. (TV: The Keeper of Traken)

"Tremas" incarnation
After possessing Tremas's body, the Master became more flamboyantly evil, bombastic and sophisticated individual, (TV: Logopolis, Castrovalva, Time-Flight, The King's Demons, The Five Doctors, The Ultimate Foe) who only put trust in himself. (TV: The Mark of the Rani) He was prone to laughing maniacally and reciting lengthy and verbose speeches, accompanied by melodramatic gestures and poses. (TV: Time-Flight, The Five Doctors, The Mark of the Rani)

This Master was unwilling to share any form of power with others, often betraying those he worked with to accomplish his own goals, (TV: Logopolis, The Five Doctors, The Ultimate Foe, Survival) even when working with his other incarnations. (COMIC: The Five Masters)

While in Tremas's body, the Master became devoted to killing the Doctor, often employing elaborate gambits and strategies to this end. (TV: Castrovalva, The Mark of the Rani; GAME: Destiny of the Doctors) However, he mused that a cosmos without the Doctor "scarcely bear[ed] thinking about", and was willing to join forces with the Doctor if he viewed it as beneficial to himself. (TV: Logopolis, The Five Doctors, The Ultimate Foe)

This Master was able to accurately predict the Doctor's movements, implementing multiple ways to kill him and maneuvering him into them with relative ease. (TV: Logopolis, Castrovalva, The Ultimate Foe) The Rani even believed that his plans were so overcomplicated that if he walked in a straight line he would get dizzy. (TV: The Mark of the Rani) Unlike his other renditions, this Master was able to improvise when things turned awry. (TV: Logopolis, The Five Doctors, Survival)

He showed a genuine disregard for life and was often uninterested in how many people died at his hands, (TV: Logopolis, Castrovalva, The King's Demons, Survival) and had a particular fondness for the Tissue Compression Eliminator. (TV: Logopolis, Time-Flight, Planet of Fire, The Mark of the Rani) However, he showed an unusual level of moral standards when he apologised to Peri Brown for involving her in a battle that was originally supposed to be between him and the Sixth Doctor, and was genuinely horrified when the Rani's contraption turned Luke Ward into a tree. (TV: The Mark of the Rani)

The Master was delighted and satisfied when Lord President Borusa addressed him as "one of the most evil and corrupt beings [the] Time Lord race [had] ever produced", but was surprised and outraged when his attempts to convince the Third Doctor of his sincerity was ridiculed and spurned. (TV: The Five Doctors)

After he was infected by the Cheetah virus, the Master became more calm and calculating. However, as the virus took it's toll, the Master became more animalistic and sadistic, taking satisfaction in murdering Karra and attempting to smash the Seventh Doctor's head with a rock during their fight. (TV: Survival)

Unlike his predecessor, this Master seemed unable to use natural hypnotism, instead using an Electro-muscular constrictor to enslave Nyssa, (TV: Logopolis) causing misdirection to discredit the Fifth Doctor at Fitzwilliam Castle, (TV: The King's Demons) and took control of Luke Ward by combining hypnotic suggestion via a crystal necklace with the Rani's mind parasites. (TV: The Mark of the Rani) When his attempts to hypnotise Sabalom Glitz with a swinging silver pendant failed due to Glitz's mind being occupied with calculating the wealth of the pendant, the Master resorted to offering Glitz a chest full of jewellery to ensure his cooperation. (TV: The Ultimate Foe)

This Master referred to the First Doctor as a bore, the Second Doctor as an incapable comedian, the Third Doctor as a worthy foe, the Fourth Doctor as "the bohemian, [and] the wanderer", the Sixth Doctor as "the blustering one in the stupid coat", believed that the Fifth Doctor was the nice one full of charm, innocence, and naiveté, and that the Seventh Doctor was too busy setting traps to realises the ones set for him. (GAME: Destiny of the Doctors)

"Tzun" incarnation
In contrast to his previous incarnation, this Master was calmer, less emotional and flustered, with a proud bearing and an inscrutable demeanour. Highly manipulative, the Master would maintain control of a situation, while making others around him think he was not.

He thought very highly of his hypnotic skills, finding it amusing when he made two guards believe he was Major Kreer. He looked down at humanity, treating them like children, and believed the concept of regeneration to be beyond them. However, he showed some respect towards Ace, who had killed his previous incarnation, believing she would make a good enforcer and admiring her willpower.

This incarnation of the Master was just as adept at winding the Doctor up as his predecessor was, claiming that the Seventh Doctor’s pacifism was pure hypocrisy. However, he did hold the Doctor in some regard, believing the Tzun incapable of overpowering him on their own, and insisting he was a threat to be eliminated, though he felt bittersweet about it, admitting to himself that the Doctor was an inspiring adversary.

Nonetheless, the Master pointed out that the Doctor preferred to kill and destroy from a distance, such as with the Sea Devils. To prove this point, the Master handed the Doctor a blaster and baited him to shoot him at close range, which the Doctor refused to do. (PROSE: First Frontier)

"John Smith" incarnation
As John Smith, the Master was a kind-hearted, charming, humble, knowledgeable gentleman who was still somehow deeply aware of his dark nature and troubled by it. (AUDIO: Master) As his true self, this incarnation had a far more darker and evil side to him than most of his other selves. He seemed to enjoy being mysterious about his true identity and enjoyed giving his enemies riddles as to who he truly was. Also compared to his other selves, this incarnation was far calmer and well spoken, which made him sound more sinister. (AUDIO: Dust Breeding)

"Evil? I crave power, dominion, knowledge of the forbidden and secret. So much more than simply "evil"."

- The Master

As John Smith, the Master's favourite dessert was marinated figs with a raspberry coulis, he grew tomatoes, made his own wine, enjoyed theatre, books, and the company of friends. The Master was not fond of dogs or people with shifty eyes. (AUDIO: Master)

While body-jumping
This rendition of the Master was generally calm and sinisterly villainous, but was also capable of terrifying rage. After being exterminated by the Daleks, the Master took possession of Bruce and, after finding that his new body was not stable, became determined to steal the remaining lives of the Doctor himself. (TV: Doctor Who)

This rendition of the Master viewed life as being "wasted on the living", and held it in no regards, killing Bruce, his wife, Chang Lee, Grace Holloway, (TV: Doctor Who) Duncan, (COMIC: The Fallen) and Violet, (AUDIO: Mastermind) whilst also attempting to kill the Eighth Doctor, (TV: Doctor Who; COMIC: The Glorious Dead) and an infant Edward Grainger. (PROSE: Prologue)

In this rendition, the Master felt a pedantic need to correct people on bad grammar. The most noteworthy occasion was when he corrected Grace Holloway's "kiss as good as me" to "[kiss] as well as [me]". (TV: Doctor Who)

When his attempt to take the Eighth Doctor's lives was thwarted, the Master reverted to a more basic, brutal approach, attempting to smash the Doctor's head in with a staff positioned around the Eye, proclaiming that life was wasted on the living and rejecting the Doctor's aid when he was being pulled into the Eye. (TV: Doctor Who)

This rendition of the Master was also petty, snapping Chang Lee's neck when he refused to follow an order, (TV: Doctor Who) turning Earth into a religious dictatorship to spite the Doctor, (COMIC: The Glorious Dead) and killing Violet solely because she foiled his attempt the kill Edward Grainger. (AUDIO: Mastermind)

Behind the flamboyancy and brutal savagery, the Master still maintained his cunning, leaving a crystalline structure on the Eye that would give the Doctor amnesia in vengeance for his previous defeat, (PROSE: The Eight Doctors) using his link to the TARDIS to send the Doctor to specific locations to later show him the folly of his worth, (COMIC: The Glorious Dead) and acquiring a casino in Las Vegas to accumulate the money needed to fund the experiments to elongate the lifespan of his host bodies, while also becoming head of the Hudson Dusters, and controlling part of the mafia. (AUDIO: Mastermind)

A patient incarnation, this Master simultaneously juggled a grand plan to achieve divine power with a pettier plan to morally humiliate the Doctor during the fight for the Glory, (COMIC: The Glorious Dead) and also, while trying to remain undetected in the history books, possessed a line of men from the Maestro family to ensure he had a succession of bodies that he could adjust well to, passing from father to son once there was a grandson alive to inhabit later on. (AUDIO: Mastermind)

"War" incarnation
This incarnation of the Master was excitable, enthusiastic, theatrical, and attention seeking, (AUDIO: UNIT: Dominion) priding himself on his fashion sense of a simple, classic suit with a velvet jacket. (AUDIO: Eyes of the Master) He was also a manipulative megalomaniac, who used his polite mannerisms to enhance his diabolicalness.

Despite his more theatrical side, this Master was as ruthless as his other incarnations, creating his own Infinite warriors by replacing human eyes with fake ones that had Eminence substance in them, (AUDIO: Eyes of the Master) and manipulating an Eminence attack on Heron's World for an experiment. (AUDIO: The Death of Hope) This Master was also unorthodox in his malice, being more interested in being cruel and spiteful, opting to humiliate and punish his opponents, even after he had bested them. He preferred to let others believe they had defeated him before turning the tides and took great pleasure in emotionally humiliating them after he took back control.

He also accused the Eighth Doctor's attitude about a war with the Daleks of being hypocritical, noting that, while the Doctor claimed not to be fighting a war with them, he had battled the Daleks across time and space. (AUDIO: Eyes of the Master)

He would often introduce himself by saying, "Hello, you!", and, much like the Sixth Doctor's habit to quoting poetry, had a flair for Shakespeare's soliloquies. (AUDIO: Eyes of the Master)

This Master also had a habit of imitating the Doctor, such as tricking UNIT into believing him to be a future incarnation of the Seventh Doctor, (AUDIO: UNIT: Dominion) taking on the Doctor's role of a lone hero saving a group of innocents, (AUDIO: The Death of Hope) and even replacing the Doctor with himself in Molly O'Sullivan's memories. (AUDIO: Rule of the Eminence)

His plans were meticulous, and like his degenerated incarnation, this Master liked to plan for every possible obstacle, but instead of waiting for the contingency to be activated by his opponents, he openly went out of his way to close off those obstacles beforehand. (AUDIO: Masterplan)

This Master was more willing to go into dangerous situations than his other incarnations, not only making deals with the Eminence and the Daleks for universal domination, but also showed signs of extreme anti-obedience and arrogance, openly mocking his allies while fully aware that they could kill him anytime they wanted. (AUDIO: Master of the Daleks)

This Master showed a brazen attitude towards his disrespect for the workings of time travel, citing that he could simply use his TARDIS to cross his own timeline and attempt to achieve a failed plan without any concern for the paradoxes or personal dangers involved in doing so. Additionally, he had no qualms about the paradoxes involved in kill the Seventh Doctor, despite already being involved in the circumstances behind his regeneration. (AUDIO: UNIT: Dominion)

A slightly lazier incarnation, this Master liked the idea of having an army, but didn't enjoy the prospect of building one up himself.

Seeing his subordinates as possessions instead of people, this Master had no compunctions towards demeaning, mind controlling or even killing subordinates who caught him the wrong way, sparing only the most important ones to his plan until they were no longer of importance. However, he praised hard work and good results, and was genuinely fond of Sally Armstrong, telling the Doctor that Sally was brilliant enough to fly his TARDIS on her own, and even briefly mourned for her after her death. (AUDIO: Masterplan)

This Master would go to great depths to involve the Doctor in his schemes, claiming that he did so simply because he enjoyed the Doctor's company. He was pleased to see the Eighth Doctor in 1970s London, and expressed concern about his haircut. (AUDIO: Eyes of the Master)

Raine Creevy characterised this Master as a "cocky smart-arse". (AUDIO: UNIT: Dominion)

While fighting in the Last Great Time War, the Master, terrified by the Dalek Emperor taking the Cruciform, ran from the War, (TV: The Sound of Drums) using a Chameleon Arch to turn himself into a human and hide at the end of the universe. (TV: Utopia)

"Yana" incarnation
Under the Chameleon Arch, Professor Yana was a benign old man who had lost faith in the Utopia Project. His spirit was revitalised by the Tenth Doctor, and the two shared a mutual admiration. He was also somewhat scatterbrained and slightly lacking in self-confidence, at one point referring to himself as "a stupid old man." Also, like the Tenth Doctor with Martha Jones, Yana could not see that his assistant, Chantho, had feelings for him.

This Master's true personality was cold, ruthless and vengeful. In contrast to his human identity, he was always serious and dignified, but also abusive, smug and condescending, citing that he had the right to defend himself after he was the one provoked. He was extremely aggressive towards Chanto after regaining his memories, citing that her constant cultural ticks drove him insane during their time together.

This Master was a misogynist, considering it an embarrassment to have been killed by a girl, and was shown to be humiliated by the mere thought of it. Despite being in pain, he welcomed his regeneration in a grandiose fashion, declaring that "the Master [was] reborn." (TV: Utopia)

As "Harold Saxon"
Immediately after his regeneration, the Master appeared to have gone more insane than ever, gleefully jumping round the Doctor's TARDIS' control console, while ecstatically laughing, and toying with his new voice. (TV: Utopia) By this point in his life, the Master was tormented more than ever by "the drums" in his head. (TV: The Sound of Drums)

Much like his previous incarnations, this Master was ostentatious; offering out jelly babies and grits, while also dancing to the Rogue Traders, (TV: The Sound of Drums) and the Scissor Sisters. (TV: Last of the Time Lords) He also enjoyed watching the Teletubbies, believing that the televisions in their stomachs was true evolution. (TV: The Sound of Drums)

He was extremely vain and self-centered, with the Doctor noting that he would never destroy himself, even if he could destroy the Earth with him. During the Year That Never Was, he had monuments of himself built all over Earth, and, according to Martha Jones, had even sculptured himself onto Mount Rushmore. His vanity was so vast that when the Doctor forgave him for his actions, the Master collapsed. (TV: Last of the Time Lords)

This Master also had an exceptionally heightened sense of his own brilliance, even reciting a Bible-style verse of his own making to the Doctor as the Toclafane invasion began. (TV: The Sound of Drums) He also held Time Lords as the absolute superior race, automatically assuming the right to alter history on the principle of him being a Time Lord. (TV: Last of the Time Lords)

Behind his charismatic and charming demeanor, this Master was sadistic and childishly degrading, even going as far as to slip subtle and private jabs at the Doctor into his public speeches. When Francine, Clive and Tish were forcibly taken to the Valiant under armed guard, the Master shamelessly treated the ordeal like a school field trip, (TV: The Sound of Drums) and, during the Year That Never Was, he kept them as slaves, taking every opportunity he could to belittle them in the most childish ways possible. (TV: Last of the Time Lords)

Even after he aged the Doctor to an elderly man, (TV: The Sound of Drums) the Master continued to humiliate his old friend by having him live in a makeshift tent aboard the Valiant during the Year That Never Was, and then furthered the humaliation by aging him further, until he morphed into an ancient dwarf-sized body, and then kept him locked up in bird cage. (TV: Last of the Time Lords)

The Master showed no hesitation when it came to murder, but would always find a motivation when he took a life; assassinating the Cabinet of the United Kingdom for abandoning their political parties when they saw the vote swinging his way, and setting the Toclafane on Vivien Rook after she uncovered his identity fraud. After revealing his true nature during the Toclafanes' live broadcast, he ordered Arthur Coleman Winters's execution as a show of power, and then commanded the decimation of the population of Earth for no other reason than to emphasise his new dominion. (TV: The Sound of Drums) When he learned that the Drast had been operating in Yokohama, he ordered the Toclafane to destroy the islands of Japan. (PROSE: The Story of Martha)

He did, however, show a sadistic glee when he resorted to murder, continuously listening in on Rook's dying screams, being exited by the prospect of killing the immortal Jack Harkness a second time, (TV: The Sound of Drums) and having a chuckle after casually killing Thomas Milligan. (TV: Last of the Time Lords) He was also known to kill those who brought him bad news. (PROSE: The Story of Martha)

Like his degenerated and Time War incarnations, this Master had dangerous forward thinking, and knew it was a mistake to give the Doctor hints about his plans while he had the power to intervene. (TV: Utopia) His methods for dealing with the Doctor during his reign as prime minister showed an efficient and simple mindset; framing the Doctor for murder to send the police after him, arresting Martha's family for insurance, and luring Torchwood Three away to the Himalayas to prevent Jack from recruiting their aide. (TV: The Sound of Drums)

The Master also shared the Tenth Doctor's technical knowledge, as he was able to construct his laser screwdriver from Earth components and miniaturise Richard Lazarus' genetic manipulation technology. He was also able to cannibalise the Doctor's TARDIS and turn it into a Paradox machine. He also designed the Archangel Network and the Valiant. (TV: The Sound of Drums)

The Master made a habit of saying, "Oh, no you don't", saying it when the Doctor was locking the TARDIS's coordinates, (TV: Utopia) when avoiding a conversation with the Doctor, and when the Doctor restored his youthful physiognomy with the Archangel Network's telepathic link. (TV: Last of the Time Lords)

While he originally showed great affection for his wife, Lucy Saxon, (TV: The Sound of Drums) the Master's vanity and overconfidence in his successful taking of Earth led him to show less concern for Lucy, even teasing her with the possibility of replacing her with his masseuse. He was, however, unsurprised when she shot him, instead making a quip about it "always [being] the women". (TV: Last of the Time Lords)

After his plans to start an intergalactic war with the universe was thwarted by the Doctor and Martha, the Master resorted to a more cowardly and desperate spitefulness, threatening to kill the Jones family after his attempts to shoot the Doctor failed, and then cowering in fear when the Doctor descended towards him with the power of the Archangel Network. After the Doctor expressed his forgiveness, the Master made a last ditch effort to destroy Earth by igniting the Black hole converters in his warships, reasoning that if he could not have the Earth then neither could the Doctor, until the Doctor pointed out that such an act would also kill the Master. (TV: Last of the Time Lords)

When the Doctor successfully reverted the Paradox machine's influence, the Master made an attempt to retreat, but gave up when Captain Jack caught him. He then beaded Francine Jones into murdering him, until the Doctor convinced her otherwise. After he expressed annoyance at being "kept" by the Doctor, the Master was shot by Lucy and, in a final show of spite, decided not to regenerate and die. Before slipping away, however, the Master fearfully asked the Doctor if he thought "the drumming" would stop after he died. (TV: Last of the Time Lords)

Damaged body
After his sabotaged revival, the Master not only became more insane than ever, but also displayed a feral state that lead him to act like a predatory animal, plagued by an insatiable hunger. Tormented more than ever by "the drumming", but also seeing it as a central piece of his identity, the Master was convinced that something was calling to him through the drum beat.

The Master still held the lives of others without thought, unceremoniously consuming Sarah, Tommo and Ginger's life forces, leaving them as skeletons. He also thrived on chaos, describing the last day of the Last Great Time War as "[his] kind of world".

Still as vain as he was before, the Master not only used the Immortality Gate to turn the human race into duplicates of himself, which he dubbed the "Master Race", he also threatened to do the same to the Time Lords, but was thwarted when Rassilon reverted the Master Race back to human.

Despite his insanity, the Master was capable of lucid conversation, nostalgically discussing their childhood friendship with the Tenth Doctor. He was also still a cunning strategist, allowing himself to remain Joshua Naismith's prisoner so he could repair the Immortality Gate and use it to create his Master Race, all so he could turn the Earth into a warship, but then improvised a plan where he used his duplicates to locate the source of "the drumming".

However, this Master was not without his limits, considering Rassilon's Ultimate Sanction to be suicidal, but was still willing to subject himself to it to appease Rassilon. He also had a sense of honour, as he sacrified himself to save the Doctor from Rassilon after the Doctor chose not to kill either of them, also getting his revenge on Rassilon for implanting "the drumming" in his head, and for Rassilon trying to kill him for being "diseased". (TV: The End of Time)

As "Missy"
After his botched resurrection, the Master regenerated into a woman. Fully embracing her new gender, the Master changed her title to "the Mistress", shorting it to "Missy", and, considering herself to be "old fashioned", insisted on being addressed as Time Lady, (TV: Dark Water) and nicknaming herself the "Queen of Evil". (TV: Death in Heaven) She also adopted a Scottish accent, claiming she would keep it after taking a liking to the Twelfth Doctor's accent. (TV: Deep Breath)

No longer choosing to hide behind a rational persona, Missy openly described herself as "bananas", but took offence when Danny Pink called her a "lunatic". (TV: Death in Heaven) She adopted a bubblier personality (TV: Deep Breath, Death in Heaven) and took on more choreographic movements. (TV: Deep Breath, Dark Water, Death in Heaven) She also displayed tendencies of being being a show-off, such as vastly enlarging her face on a UNIT monitor in a comical manner. (TV: The Magician's Apprentice)

Even though she employed a welcoming and sociable façade, (TV: Deep Breath, Into the Dalek, Dark Water, Death in Heaven) Missy had a vulnerable and broken side, particularly when she explained her entire plan was so she could rekindle her friendship with the Doctor, and when she though he would kill her to spare Clara's soul. (TV: Death in Heaven)

Believing that the Doctors saving of Gallifrey was meant to save only her, (TV: Death in Heaven) Missy acquired an obsession with the Doctor, telling the Half-Face Man that, while the Doctor could be mean to others, he would not be with her because he "loved [her] so much". She openly referred to him as her "boyfriend", (TV: Deep Breath) tracked his movements across time and space, (TV: Flatline, In the Forest of the Night, Death in Heaven) and even professed that her hearts "belonged to [the Doctor]" after passionately kissing him. (TV: Dark Water) She also began planning Osgood's murder after the Doctor invited Osgood to travel with him, (TV: Death in Heaven) and believed she should shoot the Doctor in a jealous rage when he ran off to save Clara. (TV: Dark Water) Unlike her immediate predecessor, Missy was open to the idea of being the Doctor's prisoner, so long as she and him were together. (TV: Death in Heaven)

Instead of a hunger for domination, Missy "need[ed] [her] friend back", creating an army of Cybermen from Earth's dead to give to the Doctor as a birthday present. However, this was revealed to be a plot to convince the Doctor that they were not so different by giving him an unstoppable army with which to "right wrongs", her plan being to give him an unstoppable army to corrupt his mind, turn him to her way of thinking, and ultimately rebuild their friendship. (TV: Death in Heaven)

Despite her desire to reconnect with him, Missy enjoyed taunting the Doctor about the status of the lost Gallifrey, and how she didn't have to divulge the planet's location to him. She also had no qualms about him falling to his death after destroying Boat One, though considered it a boring demise that lacked finesse. (TV: Death in Heaven)

Missy retained her predecessors' sadistic tendencies, demonstrating cruel pleasure at taunting her victims before she killed them, such as telling Dr. Chang she would miss him and promising to always keep a picture of him "looking so sweet" before she murdered him. (TV: Dark Water) She also encouraged Osgood to have more self-confidence, while counting down to her death to torment her. However, she atomized Seb without a second glance for no reason other than that the AI was annoying her. (TV: Death in Heaven)

Viewing everything as being born to die, Missy held no regrets when it came to murder, describing her urge to kill as akin to a child wanting to pop a balloon. (TV: Death in Heaven) Missy also held no respect for the dead, using dead human bodies to create a Cyberman army, (TV: Dark Water) and crushed Osgood's glasses under her heel while posthumously thanking her for being "yummy". (TV: Death in Heaven)

Unable to grasp the concept of doing something morally ambiguous to potentially improve the lives of countless others, Missy deemed any act which she viewed as evil as unchangeably bad. (TV: Death in Heaven)

Missy was a devious planner, with the Doctor surmising that she had exploited the paranoia the super rich had towards their mortality to use their wealth and mortal remains for the 3W Institute and create a new race of Cyberman. (TV: Death in Heaven)

Missy was a skilled manipulator, able to manoeuvre others into place with ease by exploiting their desires, such as Osgood's desire for the Doctor's approval and the Doctor's desire to find Gallifrey. (TV: Death in Heaven) She was also a convincing liar, especially when using her talent for manipulative reasons. She pretended to be a welcome droid, and even improvised a mnemonic acronym to go with her name, when she first encountered the Twelfth Doctor, (TV: Dark Water) and tricked him by giving him false coordinates to where Gallifrey had supposedly reappeared after her Cyberman army had been destroyed. (TV: Death in Heaven)

While she was as cunning as her male predecessors, Missy's impractically long plan for her Cyberman army was not without its faults; giving the dead a choice about whether to be cyber-converted or to live in the Nethersphere, (TV: Dark Water) trying the blow up the Doctor on Boat One despite him being instrumental in her master plan, and basing her entire plan on a moral decision that she had seen the Doctor make numerous times in previous incarnations, that of allowing one evil act to ensure the greater good, and expecting a different outcome. (TV: Death in Heaven)

Missy also opted for one single solitary scheme with virtually no contingencies or back-up plans in place to help steer events back towards her favour like her previous incarnations employed, instead opting to give the Doctor false hope of reaching Gallifrey after she was beaten. (TV: Death in Heaven)

While building up to a murder, she would insisted that her victim "say something nice" to her, and would wait patiently for them to reply. (TV: Dark Water, Death in Heaven, The Magician's Apprentice) She also insisted that anyone aiming to kill her do the same with her. (TV: Death in Heaven) She also puckered her lips and blew kisses before killing each of her victims, even applying lipstick before killing Osgood and her guards. (TV: Dark Water, Death in Heaven)

Missy showed a liking for singing, substituting her name in with "Hey Mickey" while in UNIT custody, and singing a verse from Happy Birthday, Mr. President when giving the Doctor control of a Cyberman army. (TV: Death in Heaven) She pulled a similar stunt involving "Hey Mickey" lyrics via text communication when she announced her presence to UNIT by halting all aeroplane traffic. (TV: The Magician's Apprentice)

She later expressed jealously at the idea that Davros had become the Doctor's arch-enemy and not her. (TV: The Magician's Apprentice)

Appearance and clothing
As an eight-year-old boy, the Master had dark hair and bright blue eyes. (TV: The Sound of Drums)

Thirteenth incarnation
The Master's thirteenth incarnation resembled a mature, elegant, man, with a swarthy complexion, brown eyes, and mild streaks of grey in his hair. He had a goatee beard, which also had white skunk stripe. (TV: Terror of the Autons)

He generally wore a black Cardin-Nehru jacket, with dark trousers, black leather boots and gloves, and a white cuff-linked shirt. (TV: Terror of the Autons) On occasion, he would wear a suit, with either an orange, a grey or a blue tie. (TV: Terror of the Autons, The Mind of Evil, The Time Monster)

While imprisoned on Fortress Island, the Master wore a black cape over a white turtle-neck jumper, with black trousers. (TV: The Sea Devils)

Degenerated body
After Susan Foreman used the TCE against him while he was holding a matter transmuter, (PROSE: Legacy of the Daleks) the Master came to resemble a deformed corpse, (TV: The Deadly Assassin) with brown eyes. (TV: The Keeper of Traken) However, after absorbing some energy from the Eye of Harmony, (TV: The Deadly Assassin) he became less "putrescent". (AUDIO: Trail of the White Worm)

To hide his disfigurement, the Master took to wearing a rotting hooded cloak. (TV: The Deadly Assassin)

He was described by Spandrell as being "emaciated", (TV: The Deadly Assassin) with Bob Dovie describing him as looking "burned." (AUDIO: The Light at the End)

"Tremas" incarnation
After the Master used the power of the Source to steal Tremas's body, the Trakenite's body was also rejuvenated, with his grey hair becoming a dark brown, and his white bushy beard turning into a black goatee beard. (TV: The Keeper of Traken)

After the Master stole his body, Tremas's robes inexplicably changed into a black velveteen high collared tunic with puffed sleeves and long tails, (TV: The Keeper of Traken) black trousers, dark leather boots, and black velvet gloves. (TV: Logopolis) The Master would also utilise a cloak with a large collar. (TV: The Five Doctors)

While stranded on Cheetah World, the Master opted to change his usual attire for a black coat with a white collar, with a white collared dark blue shirt and bow tie, black trousers and shoes, a silver waistcoat, and a belt with a dragon shaped buckle. (TV: Survival)

In an account that depicted this Master with greying hair, he wore a red velvet jacket, a white waistcoat with a black jumper, and a pair or dark trousers, with leather gloves and shoes, with various ringers decorating his gloves. Completing the ensemble was a black cloak with a huge collar and white linings, (GAME: Destiny of the Doctors) which the Master had also worn during his alliance with Adam Mitchell. (COMIC: Prisoners of Time)

While combating the Graak in the Determinant, the Master adopted many costume changes to suit the situation he found himself in; wearing an a conductor hat with an "M"-insignia at a platform station, a bowler hat while on a train taunting the Graak, a Dalek Trooper helmet while commanding a rocker launcher, and a plastic crown at a medieval themed festival. (GAME: Destiny of the Doctors)

"Tzun" incarnation
The Master wore a Vandyke beard, a dark Italian-designed suit, a silk shirt, and a cravat with a silver bird-of-prey tiepin. (PROSE: Housewarming)

"John Smith" incarnation
When the Master was robbed of his Trakenite body by the Warp Core, he regained his disfigured appearance, which Ace described as resembling Freddy Kruger and "a dropped pizza". To hide his disfigurement, the Master took to wearing a golden mask with diamonds encrusted inside it. (AUDIO: Dust Breeding)

After becoming John Smith, the Master did not hide his disfigurement and wore a suit instead. (AUDIO: Master)

While body-jumping
As a Deathworm Morphant, the Master resembled a snake. (TV: Doctor Who)

While within Bruce's body, the Master looked like a young American man, but his eyes appeared reptilian, forcing him to wear sunglasses to remain inconspicuous. While searching the Doctor, the Master wore Bruce's leather jacket and dark pants. When his plan neared completion, the Master changed his into traditional extravagant Gallifreyan robes, citing that he "always dress[ed] for the occasion". (TV: Doctor Who)

After gaining a new body, the Master resembled a black street preacher with a balding head. (COMIC: The Fallen) After revealing himself, he replaced his clothes with a more regal outfit. (COMIC: The Glorious Dead)

"War" incarnation
This Master had brown eyes and was bald, (AUDIO: UNIT: Dominion) with many commenting on his lack of hair. (AUDIO: UNIT: Dominion, Eyes of the Master)

He wore a plain suit with a velvet jacket, (AUDIO: Eyes of the Master) and a striped tie. (AUDIO: Masterplan) On one occasion, he wore a white Stetson hat. (AUDIO: The Death of Hope)

While posing as the "Other Doctor," the Master wore a black overcoat, with black trousers, a dark blazer, white shirt and dark green cravat. (AUDIO: UNIT: Dominion)

"Yana" incarnation
As Professor Yana, the Master looked like a elderly man with white hair and blue eyes. He wore a white stiff-collard shirt with a dark red waistcoat and a black cravat, and black trousers. In his waist coat, he housed a Chameleon Arch, disguised as an ordinary fob watch. (TV: Utopia)

As "Harold Saxon"
In this incarnation, the Master was young, with light brown hair, and dark brown eyes. (TV: Utopia) As "Harold Saxon", the Master would wear a black suit with a white shirt and black tie. While meeting President Arthur Coleman Winters, he wore a black coat with a crimson lined interior. (TV: The Sound of Drums)

After his botched resurrection, the Master's hair was bleached light blond, and he gained some stubble. To remain inconspicuous, he wore a black hooded sweatshirt over a red t-shirt with dark combat trousers and black boots.

Due to the corruption of his life force, the Master's outer skin would fade away and reveal the translucent blue life energy encasing his body, exposing his skeleton and internal organs, with each fluctuation making an unsettling primal roar. (TV: The End of Time)

As "Missy"
In her female incarnation, the Mistress looked like a mature woman with pronounced cheek bones, and light blue eyes. Her black hair was wild and free, but held in place in an up-do. She also adopted a Scottish accent like the Twelfth Doctor.

Fashioning herself in Victorian-styled garb, Missy wore a starched collared blouse (TV: Deep Breath) with cameo brooch made of Dark star alloy under her throat, (TV: The Witch's Familiar) along with a high waisted skirt that cut to ankle length, and a croak lengthen jacket which puffed up at the shoulders and dark lapels. She also wore black ankle boots with a sharp toe and tapered heels. Completing the ensemble was a black boater hat worn at a rakish angle, with an arrangement of black and red berries on the brim and a black veil over the top.

For further accessories, Missy wore a spiked bracelet on her left wrist, and carried around a black umbrella. (TV: Deep Breath)

Missy varied the colours of her clothes, with the design coming in black, (TV: Deep Breath) bottle green, (TV: Into the Dalek) a shade of dark orange, (TV: The Caretaker) plum, (TV: Flatline) and violet. (TV: The Magician's Apprentice)

Relationship with the Doctor
The Master's relationship with the Doctor was one of the most complex known between the two Time Lords. He respected the Doctor as a worthy opponent, once offering to use a recently-recovered weapon to take control of the universe while offering to share it with the Doctor. (TV: Colony in Space) As time went on, however, the Master became increasingly obsessed with proving his personal superiority, causing him to view the Doctor both as his greatest friend and his worst enemy. He expressed deep anger toward the Doctor, along with a desire for vengeance, (TV: Last of the Time Lords) and accusing the Doctor of causing him to waste his regenerations. (TV: Doctor Who)

Although initially willing to work with the Doctor when the situation required it, (TV: Terror of the Autons, The Claws of Axos) after the Last Great Time War, the Master absolutely refused to listen to the Doctor on any occasion. He evinced his vanity when the Doctor confronted him with the words "I forgive you", which he had been terrified of hearing because it significantly dented his pride. (TV: Last of the Time Lords)

The Master also had a crippling fear of an all-powerful, God-like Doctor, probably based around the Doctor's habit of challenging his old foe's grandiose self-image by constantly derailing his plans. (TV: The Mind of Evil, Last of the Time Lords) The Master enjoyed making playful flirtations towards the Tenth Doctor while speaking on the phone, even asking him if the Doctor was asking him out on a date. (TV: The Sound of Drums) When the Doctor harnessed the psychic energy of the entire human race and effectively became a god, the Master was reduced to sobbing against a wall. (TV: Last of the Time Lords)

After regenerating into a female incarnation, she took her sexual innuendos to a new level by referring to him as her "boyfriend" and holding him responsible for her fate. (TV: Deep Breath, Death in Heaven) Upon meeting the Doctor in his twelfth incarnation, she pretended to be an android and passionately kissed him. (TV: Dark Water) She later wanted to give him control of her army of Cybermen, attempting to force him to recognise that they were the same, but he refused and gave it to Danny Pink instead, who stopped her plans. While surprised, Missy didn't try to stop the Doctor as he prepared to kill her to spare Clara Oswald from doing it, but was spared from killing her by the Brigadier who, while Cyber-converted, retained his humanity and shot her. (TV: Death in Heaven) When searching for the Doctor, Missy challenged Clara's scepticism about her concern about him by claiming to have cared about the Doctor "since always" (TV: The Magicians Apprentice) and even begged the Doctor to find out about her plans. (COMIC: The Five Masters)

Companions
Unlike the Doctor, the Master usually worked and travelled alone. On rare occasion, he was seen with companions. Examples included Ailla the Time Lord spy; (PROSE: The Dark Path) Chang Lee, a young human whom the Master met in San Francisco; (TV: Doctor Who) Katsura Sato, an immortal Japanese samurai who helped the Master in his quest for Glory; (COMIC: The Glorious Dead) Sally Armstrong, who helped him to use the Eminence; (AUDIO: Time's Horizon) Chantho, a female assistant and companion to the Master in his Professor Yana identity; (TV: Utopia) and Lucy Saxon, his wife, who was described as having travelled with the Master in the TARDIS in the same fashion as the Doctor and his companions. (TV: The Sound of Drums)

Clara also temporarily became Missy's companion when they both teleported out of the Dlaek city together. Master treated Clara as her "canary" forcing her to act as bait for the Daleks and test the safety of their situations first. She also made her get inside a Dalek casing so they would be able to sneak back into the city convincingly. (TV: The Witch's Familiar)

Character conception and development
When conceiving the character, the production team had originally considered the idea of the Doctor having a female arch-nemesis rather than male one (this idea was later revived with the creation of the Rani). Later, they thought of the Master as the evil half of a single personality. The Master's name was dreamed up as another counterpart to the Doctor's — like that of his enemy, "Master" is an academic title. But this does not mean that the Master has a lesser academic degree than the Doctor, as in a Masters Degree. Both being Time Lords, they have the same level of education and are graduates of the Time Lord Academy. In The Sound of Drums, we learn that both had chosen their names because of what they meant - the Doctor as a healer of wrongs, the Master because of his desire for conquest and dominance.

In the Third Doctor's original final episode concept, Roger Delgado's incarnation of the Master would have redeemed himself and given his life to save the Doctor, after which the Doctor would have regenerated; however, this story was never developed due to Delgado's accidental death. Over thirty years later, this idea would be reused in The End of Time with John Simm's incarnation of the Master sacrificing himself to save the Tenth Doctor from Rassilon.

In The Deadly Assassin, writer Robert Holmes deliberately chose to show the Master in a "transitional" form in case future production teams wanted to bring back the character. This transitional form was also used in The Keeper of Traken.

The Master was the villain in the early drafts of the 1977 television story The Talons of Weng-Chiang.

Is "Koschei" his true name?
The name "Koschei" has been developed in various novels. However, like the Doctor's name, the Master's actual moniker has never been revealed in performed Doctor Who. It should also be noted that none of these various novels says Koschei was his original name, in the same vein that "Theta Sigma" is not the Doctor's original name.

Still, the name has a befitting Russian heritage. Koschei (rus. or Коще́й Бессме́ртный, "Koschei The Deathless") is an antagonist in Russian folklore. He is an immortal who hides his soul inside a needle, which is inside an egg, in a duck, inside a hare, in an iron chest which is buried under a tree on the island of Buyan. As long as his soul is safe, he cannot die.

How many Masters?
It has never been firmly established on screen how many incarnations of the Master have existed. The only number explicitly given by any narrative is that found in TV: The Deadly Assassin, where the Master is said to be near the end of his thirteenth and final life. In PROSE: Legacy of the Daleks, it's unambiguously established that Susan Foreman uses a combination of the Master's Tissue Compression Eliminator and her knowledge of the TARDIS to wreak devastating physical damage on the Roger Delgado Master, and the form portrayed by Geoffrey Beevers and Peter Pratt is merely the degenerated form of Delgado and not a wholly different incarnation.

Afterwards, Anthony Ainley's version of the Master takes over Tremas' body goes on to plague the Doctor until the original series' end. Despite no actual regeneration, it's technically a different form.

There are no narratives whatsoever which unambiguously define the relationship between the Ainley Master and those that follow him, meaning that it's impossible to assign numbers to the Master's forms, in the same way that we would with incarnations of the Doctor.

That hasn't stopped at least one non-narrative source from trying, though. The 2010 edition of Doctor Who: The Visual Dictionary indicates that the Master played John Simm is the seventeenth form. However, there's no narrative evidence to support any of the Visual Dictionary claims.

Off-screen relationships
Although they played antagonists on screen, in real life Roger Delgado and Jon Pertwee were actually close friends. In interviews and convention Q&A sessions, Pertwee often cited the death of Delgado as one of the factors that led him to give up the role. (DOC: PanoptiCon 93, MM VHS 15)

Long before Tom Baker met Anthony Ainley during the filming of his last episode, he had lived with his brother, Richard Ainley, an acting instructor. Tom often saw Anthony, who would come over to play with Richard's children, but always thought of him as mysterious.

Audio
Geoffrey Beevers is the main portrayer of the character in Big Finish audio dramas. Sometimes, as in The Fourth Doctor Adventures, he's merely reprising the pre-Tremas Master seen in The Keeper of Traken. On other occasions, he has portrayed a post-Survival Master that has had the Tremas layer peeled away. Thus, in Dust Breeding and Master, he is once again the decayed version of the Delgado Master. On yet another occasion, in Mastermind, he played a post-TV movie Master, who switched bodies yet again using the Deathworm.

Alex Macqueen has portrayed the Master in the audio dramas UNIT Dominion, Time's Horizon, Eyes of the Master, The Death of Hope, The Reviled, Masterplan and Rule of the Eminence, set at a time where the Master is given a new regeneration cycle by the Time Lords and is set to work on their behalf.

Additionally, in The Hollows of Time, an audio adaptation of an unrealised 1980s Sixth Doctor script made as part of The Lost Stories range, a character called Professor Stream appears, played by David Garfield. While he was supposed to be revealed as the Ainley incarnation of the Master in the original script, he was not identified as the Master in the audio version.

Anagrams
During Anthony Ainley's tenure as the Master, pseudonyms made from anagrams of the actor's name were often used in the credits for the Master's disguises, such as Neil Toynay for the Portreeve in TV: Castrovalva. Tremas is itself an anagram of Master.

The tradition has continued in the BBC Wales version of the show. During Series 3, the Master takes on two new identities, Professor Yana in TV: Utopia, and Mr. Harold Saxon in TV: The Sound of Drums and TV: Last of the Time Lords. Yana is an intentional acronym of 'You Are Not Alone, the final words of the Face of Boe, which led the Doctor to discover that Yana was a Time Lord. "Mister Saxon", as the character was mysteriously referred to throughout series 3, is an anagram of "Master No. Six" - John Simm's rendition being the sixth on-screen version of the character. However, Russell T Davies has claimed that this anagram was unintentional.