User:BananaClownMan/Sandbox/Missy (The Master)

Regenerating into a female body, the Master restyled herself into Missy, the self-proclaimed "Queen of Evil". She embarked on a scheme to rekindle her friendship with the Doctor, believing she could convince him they were the same by offering him the power to end tyranny with an army of Cybermen, but the Doctor refused to submit to the temptation.

Eventually, Missy would be captured and imprisoned with Quantum Fold Chamber that was moved into a vault at St Luke's University by the Twelfth Doctor and Nardole, with the Doctor taking this opportunity to try and rehabilitate Missy and rekindle their friendship on his terms. Just as she was about to make a breakthrough, Missy joined with her previous incarnation, only to then betray and kill him to join the Doctor, but was killed herself before she could.

A day to come
After being shot by Lucy Saxon as comeuppance for their abusive marriage, the Master was implored to regenerate by the Tenth Doctor, but the Master, not wishing to be taken in by the Doctor after he undid his reign on the Earth, instead refused and died, (TV: Last of the Time Lords) having already set in motion the means of his resurrection. (TV: The End of Time)

Post-regeneration
After years trapped on a Mondasian colony ship that was experiencing time dilation due to pulling itself away from a black hole, the Master was fatally injured by a future incarnation of himself so that he could not interfere in the counterattack against the Cybermen, though he was able to kill the future incarnation before retreating to his TARDIS. (TV: The Doctor Falls) After returning to his TARDIS, the Master regenerated into his nineteenth incarnation, (PROSE: Girl Power!) the same incarnation that had fatally wounded him. (TV: The Doctor Falls) Due to the presence of her older self during the events surrounding his regeneration, she was left unable to recall the exact specifics of it due to their timelines being out of sync, (TV: The Doctor Falls) recalling only that she woke up in a female body, (AUDIO: The Bekdel Test) and also lost all knowledge of his time on the Mondasian colony ship, (TV: World Enough and Time) save only that a "very scary lady" advised him to always carry a spare dematerialisation circuit. (TV: The Doctor Falls)

As with her previous incarnations, the Master went to the Scoundrels Club to recover from the regeneration. She was ousted from the Club for being a woman, leading her to kill each member for revenge, and taking the nickname "Missy" on the suggestion of an 18th century woman named Saffron. (PROSE: Dismemberment)

Early endeavors
Under unknown circumstances, Missy managed to acquire a vortex manipulator. (TV: The Magician's Apprentice)

Reclaiming her friend
Missy met her former wife, Lucy Saxon, in London, who had been sent to sell three matrix data slices to another incarnation of the Master. Missy spoke to Lucy about her husband and told her that one day she would have to kill him with a gun. Lucy listened to her story about what would happen to her, and how it would all work out, though she did not tell Lucy that these events would also result in her death. Lucy agreed to the terms and gave her the three matrix slices. (PROSE: The Unwanted Gift of Prophecy)

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)

Missy decided to manoeuvre Clara Oswald into becoming the Doctor's companion, believing that Clara was just the right companion to attract the Doctor's interest and make it easier for Missy to emotionally manipulate him, (TV: Death in Heaven) showing him "the friend inside the enemy [and] the enemy inside the friend." (TV: The Witch's Familiar) Ashildr believed that Missy placed the two together so that that the Doctor and Clara in tandem would become the Hybrid of Gallifreyan myth. (TV: Hell Bent) In 2013, Missy gave Clara 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) She then kept the Doctor and Clara together into the Doctor's twelfth incarnation by placing an ad in a newspaper for Mancini's Family Restaurant. (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 made her "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)

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 and exploded above major population centres, creating clouds that rained Cyber-pollen, turning the dead into Cybermen. Taken onto Boat One along with the Doctor, she sent out a signal to the Cybermen, to attack the plane before freeing herself and disintegrating Osgood, (TV: Death in Heaven) either the human or the Zygon one. (TV The Zygon Invasion) Missy then ordered the Cybermen to remove a piece of the fuselage, causing Kate Stewart and the Doctor to be sucked out before ordering the Cybermen to destroy the plane, and teleporting away.

In the Nethersphere, Missy and Seb watched the Doctor free falling and saving 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 Missy 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 them. 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 turned control over to 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 Miss and, decided to kill his old friend himself to "save [Clara's] soul". Before he could fire the weapon, Missy was shot by a rogue Cyberman, who was revealed to be Brigadier Lethbridge-Stewart, (TV: Death in Heaven) but Missy used the energy from the blaster to recharge her vortex manipulator and escape undetected. (TV: The Witch's Familiar)

Trapped on Skaro
Some time later, after he was summoned by Davros, (TV: The Magician's Apprentice) the Doctor left his confession dial with Ohila (WC: Prologue) for her to deliver to Missy. Missy 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 and Clara had survived by using the Dalek blasts to recharge her vortex manipulator and one she gave Clara, and teleporting from the Dalek city, burning them out in the process.

Missy and Clara entered the Dalek sewers, composed of rotting Daleks, using Clara to lure a Dalek there. She cut through its case using her dwarf star alloy brooch, enabling the rotting Daleks to kill it. She 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 incapacitation 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.

With the city 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. Trying to escape, she was surrounded by Daleks when the city crumbled in on itself, but purported that she had "a really clever idea". (TV: The Witch's Familiar) One Gallifreyan believed that, after she escaped the Daleks on Skaro, Missy went back to Gallifrey and told Rassilon that the Doctor knew about the Hybrid. (PROSE: A Brief History of Time Lords)

After Skaro
Hearing that the Twelfth Doctor and Clara had been forced to enter The 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 hypnotise 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 hypnotise 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)

Missy became a headteacher for the school Saxon Heights after she had done away with the previous one. She had implemented new and strange rules, such as a school uniform that was almost identical to her own clothing, and getting rid of everyone's mobile communication devices, with her excuse being that they were used too often. However, the real reason was because that she wanted to summon up a Daemon by hooking up her newly acquired devices to a transmitter. The Osgoods found this out and had UNIT stop her, although Missy managed to escape. (PROSE: Yes, Missy)

Missy goaded the Doctor into following her through various time periods while she stole valuable items. The Doctor was too late to stop her each time. Finally catching up with her in the Stone Age, the Doctor revealed to her that he had discovered her true plan: to leave Cybermats behind where she stole each item. Missy expressed her desire to further reveal her plan to him. The Doctor instead refused to listen and boarded the TARDIS in search of some lunch. (PROSE: Dr. Twelfth)

In 1963, Missy filled in as Coal Hill School's supply room teacher. She added a ladder to the supply room which allowed the First Doctor and Shivani Bajwa to escape a pack of alien wolves. Shivani later described the incident to Missy and thanked her for the ladder. (PROSE: Doctor Who and the Horror of Coal Hill)

Imprisoned in the Vault
After she was captured by an unnamed species on an unnamed planet, Missy was sentenced to death. In accordance with their Fatality Index, the Doctor was chosen to carry out the sentence. However, he sabotaged the execution machine so that she was knocked unconscious instead of being killed. Swearing an oath to guard Missy's "body" for a thousand years, the Doctor scared the executioners away and had Nardole place her inside a Quantum Fold Chamber. (TV: Extremis) The Doctor and Nardole transported the vault to St Luke's University, where they continued to guard it for several decades. (TV: The Pilot)

In 2017, (TV: Knock Knock) after the Doctor began travelling with Bill Potts, (TV: The Pilot) Missy began banging on the doors of the vault, only for Nardole to assert that he would stand guard and prevent her escape. (TV: Thin Ice) When he later double-checked the locks, she started playing Für Elise on a piano the Doctor had given her. Once Nardole was dismissed by the Doctor, Missy started playing Pop Goes The Weasel when the Doctor told her about his adventure at 11 Cardinal Road. (TV: Knock Knock)

After he received an email from a simulation of himself warning of an upcoming invasion, the Doctor became tempted to release Missy from the vault. (TV: Extremis) When the Monks later occupied the Earth, the Doctor was kept prisoner for six months. After Bill helped him escape, he decided to consult Missy on how to defeat the Monks. Missy revealed she had dealt with them before, and that the only way to weaken their grip on power was to kill the psychic lynchpin being beamed to the whole planet. After the Monks had been driven off-world, the Doctor visited Missy in the vault again. This time, she claimed to be in deep regret of all the people she had killed throughout her lifetimes. The Doctor assured her she was making good progress on her redemption. (TV: The Lie of the Land)

Nardole later released Missy from the vault so that she could help him return the TARDIS to 1881 Mars. However, the Doctor reminded her she was acting against their agreement and that he would put her back in the vault. (TV: Empress of Mars)

Deciding Missy was worth trusting, the Doctor released her from the Vault to perform maintenance work on the TARDIS while he took Bill and Nardole to find the lost Roman legion. Missy finished the work, then took to watching the Doctor until he returned some days later. Nardole was frustrated that the Doctor had freed her, but he brushed him off, preferring to see if Missy had learned anything. Missy later cried as the Doctor watched on, both wondering if it was possible for them to be friends again and whether Missy was finally becoming the person the Doctor had desired to make her. (TV: The Eaters of Light)

The Mondasian colony ship
To test Missy's goodness, the Doctor recruited Bill and Nardole to be her "companions" and followed a distress signal to a colony ship while the Doctor monitored Missy's progress from the TARDIS. However, Missy was ill-prepared to handle a frightened crewmember, Jorj, who subsequently shot Bill; she was carried off by passengers from Floor 1056. Missy accompanied the Doctor and Nardole down to Floor 1056, where the Doctor left her in charge of gleaning information from the computers. She discovered that the colony ship originated from Mondas while being pestered by a man called "Razor", who, upon confrontation, revealed himself to be, who Missy appeared to join forces with for the "Genesis of the Cybermen". (TV: World Enough and Time)

However, when the Cybermen turned on them, Missy knocked the Master down and claimed to have been playing him while still on the Doctor's side, but then admitted to being unsure of her allegiance. Just as Nardole arrived with a stolen shuttlecraft, the Doctor was attacked by one of the Cybermen. Missy entered the shuttle after the Master, as her younger self attempted to convince Nardole to leave without him. However, their shuttle was stopped by the Cyber-converted Bill, who still retained her humanity. Crashing through the floors, the shuttlecraft gave out at one of the solar farms on Floor 0507. After two weeks of searching, the Master and Missy found disguised lifts, but Missy accidentally summoned the Cybermen in her attempt to escape. Unable to return to the Doctor's TARDIS due to how quickly time was moving on the floor of the Cybermen, the Doctor insisted that they had to prepare for a confrontation.

As the Doctor prepared to fight, the Master explained to Missy how he had blown the dematerialisation circuit in his TARDIS, which was surrounded by Cybermen on the bottom floor. Missy, recalling an instance where a very scary woman had pushed him up against a wall and insisted that he always keep a spare dematerialisation circuit, pushed the Master against the wall and insisted that he always keep a spare dematerialisation circuit, revealing the spare dematerialisation circuit she kept on her person. Before departing, however, the pair asked what the Doctor's plan was, knowing that he wouldn't be able to save everyone on the ship. As the Doctor explained that he wanted to save these people simply because it was the right thing to do and then implored the Master to stand with him, something the Master rejected, but Missy, speaking with the Doctor in private, admitted that she too wanted to stand with the Doctor as an ally, but still left with the Master. (TV: The Doctor Falls)

Death
As they prepared to depart, Missy offered to hug the Master and, after stating her enjoyment for being him, she stabbed the Master in the back, mortally wounding him in order to force his regeneration into her, but made the wound precise so that he would have time to reach his TARDIS before the regeneration occurred. Missy then helped the Master into the lift, explaining that she planned to stand with the Doctor and that it was the inevitable end that they had been leading towards their entire lives. However, the Master, declaring that he would never stand with the Doctor, shot Missy in the back with his laser screwdriver at full blast, mortally wounding her beyond the point of regeneration. With both of them laughing, the Master declared that their perfect ending was always going to be "shoot[ing] [them]selves in the back." As the Master departed for his TARDIS, Missy collapsed to the ground and died. (TV: The Doctor Falls)

Personality
Though he had previously preferred a male form, (PROSE: The Novel of the Film) the Master was indifferent when he learnt he would regenerate into a woman, (TV: The Doctor Falls) and, fully embracing her new gender, the Master changed her title to "Mistress", shortening it to "Missy". Considering herself to be "old fashioned", she insisted on being addressed as Time Lady, (TV: Dark Water, The Witch's Familiar) while 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) occasionally utilising other accents when she felt the need. (TV: Death in Heaven, The Witch's Familiar)

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 also displayed tendencies of being a show-off, such as when vastly enlarging her face on a UNIT monitor in a comical manner to show UNIT that she could, (TV: The Magician's Apprentice) and enjoyed having information that others did not, such as having knowledge of the Doctor's past that others could not argue with. (TV: The Magician's Apprentice, World Enough and Time)

Though she adopted a bubblier personality with a welcoming and sociable façade, (TV: Deep Breath, Into the Dalek, Dark Water, Death in Heaven) and more choreographic movements, (TV: Deep Breath, Dark Water, Death in Heaven, The Witch's Familiar, World Enough and Time) Missy was more open about her loneliness, and willing to show when she was afraid and remorseful. (TV: Death in Heaven, The Magician's Apprentice, The Lie of the Land, The Eaters of Light)

In her own words, Missy was "especially spiteful". Indeed, she began murdering some of the Scoundrels Club's members and enslaving the others after they refused to allow her to remain a member. (PROSE: Dismemberment)

Believing that the Doctor's saving of Gallifrey was meant to rescue only her, (TV: Death in Heaven) Missy's affection for the Doctor became more conspicuous, 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 mockingly professed that her hearts "belonged to [the Doctor]" after passionately kissing him. (TV: Dark Water) Despite these implications of their relationship being romantic, Missy adamantly denied that she loved the Doctor, even showing disgust at the thought, insisting it to be a complicated friendship, though expressed jealous irritation when the Doctor called Davros his "arch-enemy", (TV: The Magician's Apprentice) and would become upset and querulous when he did not show interest in her plans. (COMIC: The Five Masters; PROSE: Dr. Twelfth)

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) and having a preference for killing "clever-clogs" because they "[made] the best faces". (TV: The Witch's Familiar) When building up to a murder, Missy would insist 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) and would take offence if a threat to kill her was not carried out. (TV: The Witch's Familiar)

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 atomised Seb without a second glance for no reason other than that the AI was annoying her. (TV: Death in Heaven) Missy also held no respect for the dead, using dead human bodies to create a Cyberman army, (TV: Dark Water) as well as crushing Osgood's glasses under her heel while posthumously thanking her for being "yummy". (TV: Death in Heaven)

Missy could be needlessly cruel in her interactions with others, such as taunting Clara Oswald about her dead boyfriend, (TV: The Magician's Apprentice) and pushing Clara down a hole to test its depth. (TV: The Witch's Familiar) She also ordered the death of Belgians for no reason, (TV: Death in Heaven) vaporised UNIT personnel to prove she had "not gone good," (TV: The Magician's Apprentice) and was believed by Ashildr to have united Clara and the Doctor together just to see what chaos would result from their clashing personalities. (TV: Hell Bent) She would sometimes act childish or ignorant so that others around her would drop their guard. (PROSE: Dismemberment) However, when Missy learnt that the Doctor had departed Darillium to leave River Song to her fate, she offered her sincere condolences for his loss. (TV: Extremis)

During her imprisonment in the vault, Missy went "cold turkey" on being evil as the Doctor tried to rehabilitate her into being good, which first worked to the extent that she grew remorseful for all the people she had murdered, (TV: The Lie of the Land) and then to the point that Nardole trusted her enough to retrieve the Doctor and Bill from Mars, (TV: Empress of Mars) which in turn resulted in the Doctor trusting her enough to do "maintenance" on his TARDIS. (TV: The Eaters of Light)

Though she continued to show progress with her rehabilitation and made an effort to do good on the Mondasian colony ship, when she was approached by her past incarnation, she relapsed back to being evil by allying with him, (TV: World Enough and Time) but continued to be conflicted with her allegiance, admitting to the Doctor that she was "in two minds" about what she wanted. However, after being moved by the Doctor's speech on kindness and request for her help, Missy stabbed her past incarnation so that he would regenerate into her and she could stand with the Doctor, only for the Master to shoot her beyond regeneration, leading to her death, though she shared the amusement in her "perfect ending" being shot in the back by her past incarnation. (TV: The Doctor Falls)

Habits and quirks
Missy showed a liking for singing, substituting her name in with "Mickey" in the song "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 "Mickey" lyrics via text communication when she announced her presence to UNIT by halting all aeroplane traffic, and, when imprisoned by Colony Sarff, she passed the time by partaking in opera singing. (TV: The Magician's Apprentice) Missy was also good at playing the piano, and passed her time in the vault playing Für Elise, Pop Goes The Weasel, (TV: Knock Knock) and The Entertainer. (TV: The Lie of the Land)

Skills
Missy was a devious planner and skilled manipulator, able to manoeuvre others into place with ease by exploiting their desires. (TV: Death in Heaven) While trapped on Skaro with Clara Oswald, Missy demonstrated fluid planning as her desires changed from wanting to ally with the Daleks, (TV: The Magician's Apprentice) to wanting to help the Doctor, to then wanting the Doctor to unintentionally kill Clara. (TV: The Witch's Familiar) She was also a convincing liar, especially when using her talent for manipulative reasons. (TV: Dark Water, Death in Heaven) However, Missy would often opt for one 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) and walking away with nothing but taunts to say when the Doctor didn't kill Clara. (TV: The Witch's Familiar)

Sharing the Doctor's observational skills, Missy could tell a man she had killed was a married father by the ring on his finger and the detection of "baby leakage" on his jacket. (TV: The Magician's Apprentice)

Appearance and clothing
In her nineteenth incarnation, (PROSE: Girl Power!) Missy 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's. (TV: Deep Breath)

Fashioning herself in Victorian-styled garb, Missy wore a starched collared blouse (TV: Deep Breath) with a 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, with a blouse shirt coloured in white (TV: Deep Breath) or green. (TV: The Lie of the Land) 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, carried around a black umbrella, and wore two rings on her right hand, and one ring on her left hand. (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)

Before she was imprisoned in the Vault, Missy's up-do hair had grown in length, she had began wearing leather clothes, and she had replaced her brooch with a dark orange necktie. (TV: Extremis) After spending a number of years in the Vault, her hair grew out into a messier style. (TV: The Lie of the Land)

Doctor Who The Official Annual 2018
According the Doctor Who The Official Annual 2018, which is not accepted as a valid source for in-universe articles on this wiki, Missy remained on Skaro after The Witch's Familiar, adopting a Slyther as a pet that ate the Thals she met.

When Missy was put on trial for her "crimes against the universe throughout all [her] lives", she talked her way out of being sentenced for the events of The Year That Never Was by pointing out the Doctor's undoing of those events, for the murder of Petronella Osgood by pointing out the two Osgoods still working for UNIT, for the event at Devil's End by pointing out she had already been tried for that crime and cleared up confusion about her involvement in the Death Zone by reminding everyone that Borusa was the culprit. She was, however, eventually sentenced to death for pushing a girl into a volcano on Riga-Priam, which she had mentioned doing in The Lie of the Land.

Other matters

 * Missy's appearance is based upon that of the Julie Andrews version of Mary Poppins. For example, when first introduced in the stage directions from the script of Deep Breath, Missy was physically described thus: "She's dressed a little like Mary Poppins." Furthermore, Missy imitates the style of Mary's arrival (floating down from the sky using an umbrella) in Death in Heaven.