User:BananaClownMan/Sandbox/The Master (Spy)

Having somehow managed to survive her death from the laser screwdriver, and regenerate into a new body, the Master returned to Gallifrey, and learnt that its entire history had been "built on the lie" of the Timeless Child. Embittered by this secret, he took revenge on his home-planet, leaving it in ruin.

Wanting to inform the Thirteenth Doctor of his discovery, the Master worked with a race called the Kasaavin and tech billionaire Daniel Barton in a plot to wipe out humanity. His plan was thwarted at the last second by the Doctor, and the Master was imprisoned in the Kasaavins' realm.

Biography
After her apparent death at the hands of her past self, (TV: The Doctor Falls) Missy found a way to change into their twentieth incarnation. (PROSE: Girl Power!)

At one point, the Master returned to Gallifrey, where he learned the truth of the Timeless Child. Enraged by the deceit told to him all this time, the Master ravaged Gallifrey and left the Citadel in a flaming ruin, having apparently killed all of the Time Lords. (TV: Spyfall)

Undercover as O
The Master used his Tissue Compression Eliminator to kill newly-recruited MI6 agent "O" and took his identity, masquerading as him for a very long time. He formed an alliance with to-be former agent Daniel Barton and a species known as the Kasaavin from another dimension. He was eventually sacked by "C" and went off-grid.

The Kasaavin began to attack spies from different agencies all across the Earth as they became aware of their existence, leading MI6 to track down the Thirteenth Doctor, who would come into contact with "O." While at MI6's HQ, the Master personally executed "C," the ensuing Kasaavin forced the Doctor and her friends to flee to "O"'s alleged location in the Great Victoria Desert. Upon their arrival, "O" greeted them accompanied by Australian Secret Service agents Seesay and Browning. He assisted the Doctor with his findings and traveled with the team to confront Barton.

At Barton's party, he blended in with the other guests until Barton fled, making the team pursue him to an airport. As Barton was about to take off, the team ran to the plane, with "O" almost not catching up, revealing he's been terrible at sprinting. This triggered the Doctor's suspicion as "O"'s file said he was a champion sprinter.

After being confronted by the Doctor over the inconsistency, the Master revealed his true identity, even showing her the shrunken corpse of the real "O." He revealed he had been working with Barton and the Kasaavin to assimilate all of humanity by using their DNA as a planet-size hard drive. (TV: Spyfall)

Chasing the Doctor
With the Doctor escaping, the Master chased her through time, eventually confronting her directly atop the Eiffel Tower at the height of the Second World War in France. There, the Master revealed his real plan had been to get the Doctor's attention and persuade her to return to Gallifrey. Denying him, the Doctor damaged the perception filter he was using to disguise his non-Aryan appearance to the Nazi soldiers he was working with so that they would capture him. (TV: Spyfall)

Trapped in the Kasaavin realm
Having waited seventy-seven years, the Master finally returned to confront the Doctor once more in 2020, where the Doctor revealed the Master thought little of the Kasaavin. Furious, the aliens captured the Master, trapping him in their reality for his lack of integrity. (TV: Spyfall)

Personality
The "Spy" Master enjoyed playing long games, like tricking the Thirteenth Doctor into believing he was "O", gleefully clapping his hands at the Thirteenth Doctor's inability to deduce who he was despite giving clues and expressing he had had "a lot of fun" when she finally realised he had fooled her. The "Spy" Master could fall into momentary fits of rage when the Doctor gained an advantage over him, especially when successfully tricking him into giving away information he did not wish others to know.

While not above working with others to achieve his goals, the Master did not see his partners as equals but more so as assets to use for his own gain and dismiss once they had served their purpose.

He had a passion for killing others, remarking it felt right in his hearts to do so. This passion, when infused with anger, was reawakened in him when he discovered the lies about the Timeless Child that the Time Lords had committed, driving him to commit genocide back on Gallifrey. Despite his love of killing, he showed remorse about the genocide.

Despite not wanting her as his enemy again, the Master loved playing mind games on the Doctor and treating her as an inferior, having her kneel before him when he was holding hostages. He chased her through time to force her to listen to him just to get a message across, but would express rage when she outsmarted him. (TV: Spyfall)

Habits and quirks
The "Spy" Master held a flair for using elaborate disguises, even going as far as shaving his head while disguised as a Gestapo officer in 1943. (TV: Spyfall)

Appearance and clothing
The "Spy" Master was a short-standing, skinny man with dark skin, black hair, and brown eyes. While he went with a stubble appearance as "O", once he outed his true identity, he grew out a complete beard. When not in disguise, he tended to wear suits, particularly ones with a bow-tie.

He regularly disguised himself as various individuals, such as British MI6 off-grid agent "O", an auction dealer and even a Nazi officer, shaving his hair off for the latter. (TV: Spyfall)