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In a physically degenerated condition and with no more regenerations left, the thirteenth incarnation of the Master attempted to find an energy source to restore himself.
Biography
Escape to Tersurus
In his prior incarnation, he killed Susan Foreman's husband David Campbell and kidnapped her. On the planet Tersurus, where he had taken his TARDIS, Susan used the telepathic circuits of his craft against him. Susan then caused an explosion in which the Master got caught. By the time the Time Lord Chancellor Goth had come to Tersurus, the Master had exhausted his regeneration cycle recovering from the injuries. Goth had come to Tersurus to investigate the materialisation of an un-authorized TARDIS. (EDA: Legacy of the Daleks) Goth found the Master, in a wasted condition. The Master had by this time reached the end of his cycle of regenerations and had begun to degenerate physically. He turned into a decaying animated corpse. (DW: The Deadly Assassin)
On Gallifrey
The Master made Goth, in line for the position of Lord President of the High Council of Time Lords, into his slave. He also took over the mind of Solis, one of the Chancellory Guard. With a telepathic summons and a vision of the future created by the Matrix, The Master lured the Fourth Doctor to Gallifrey to prevent the murder of the then-serving Lord President. The Doctor failed and ended up on trial for the President's murder. In the mean time, the Master casually killed a guard with his Tissue Compression Eliminator and left it for the Doctor to find like a grisly calling card.
Secretly, the Master had access to the Matrix. He also had guessed the secret of the Eye of Harmony and various artifacts left behind by Rassilon. He realised that the Eye of Harmony, a black hole, resided beneath the Panopticon and, realizing that it had immense power, believed he could use the Sash of Rassilon to protect himself from the raw power of the Eye and the destruction that unleashing it would cause. He thought that it could channel that energy to renew himself. The Doctor defeated the Master in physical combat. The Master appeared to have fallen into a crevice created by a localized earthquake. In fact, he had gained access to his TARDIS, disguised as a grandfather clock and escaped. Cardinal Borusa determined to make it look to the people of Gallifrey as if Goth had died attempting to stop the Master's evil plans. (DW: The Deadly Assassin)
On Traken
The Master returned to the planet Traken, the center of Traken Union in a TARDIS configured into the sculpture-shaped Melkur. He set about a plan to steal the Source 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. Defeated once more by the Fourth Doctor and Adric, he took over the body of Tremas. (DW: The Keeper of Traken)
Personality
This incarnation was far less charming and witty than his previous incarnation and mainly preoccupied with finding a way to regenerate. The vengeful and vindictive side of the Master was at its most apparent in this incarnation. While the previous version had held back for killing the Doctor (and on some occasions tried to recruit him as a partner), this version is obsessed with killing his old enemy. Hatred is the dominant emotion driving him on. (DW: The Deadly Assassin, The Keeper of Traken)