- You may be looking for Yana (The Stone House).
After spending many years living as a humble human scientist on Malcassairo, the Master was reawakened by Martha Jones, and he made to steal the Doctor's TARDIS from the Tenth Doctor, but was fatally shot by Chantho, the Malmooth assistant to his human persona, and forced to regenerate into a younger body.
Creation
At some point after he saw the Dalek Emperor take control of the Time Lords' Cruciform, which frightened him into fleeing from the war. (TV: The Sound of Drums) The Master fled to the far end of time and sent his TARDIS away to Gallifrey without him. He then used a Chameleon Arch to turn himself into a human, intending to eventually resume control of his body once the Time War had ended. (TV: Utopia, The Sound of Drums)
Biography
Creation
At some point after he saw the Dalek Emperor take control of the Time Lords' Cruciform, which frightened him into fleeing from the war. (TV: The Sound of Drums) The Master fled to the far end of time and sent his TARDIS away to Gallifrey without him. He then used a Chameleon Arch to turn himself into a human, intending to eventually resume control of his body once the Time War had ended. (TV: Utopia, The Sound of Drums)
Return
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Professor Yana met the Tenth Doctor, Jack Harkness and Martha Jones, who spoke phrases curiously familiar to him, phrases such as Time Vortex, "extermination", Time War, Daleks and regeneration. Martha made the Professor aware of a watch in his possession. Hearing voices in his mind that commanded and entreated him, he opened it and returned to his true identity as the Master. (TV: Utopia)
Death
The Master then locked the Doctor out of Yana's lab, and opened the gate keeping the Futurekind at bay to keep the Doctor occupied as he ravaged Yana's lab. After Chantho threatened him with a gun to stop him destroying their work, 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 and deadlock sealed the door shut to keep the Doctor out. Finding the idea of dying by the hand of "an insect and a girl" undignified, the Master decided to regenerate into a form that was as young and strong as the Doctor was. (TV: Utopia)
Legacy
The dying Face of Boe warned the Tenth Doctor of the Master's impending return with the last words, "You are not alone", (TV: Gridlock) which the Doctor eventually realised worked out to the acronym "YANA". (TV: Utopia)
Personality
After returning to his true identity, the Master became cold, ruthless, and dignified, but also abusive and condescending, citing that he had the right to attack Chanto when she pointed a gun at him. He was extremely aggressive towards Chantho after regaining his memories, stating that her constant cultural ticks drove him "insane" during their time together. He also ferociously resented her for not thinking that she could set him free from the fob watch. The Master held his 'human' self in contempt, seeing it as merely a disguise so perfect that he forgot his own identity. (TV: Utopia)