Time Lords can only regenerate twelve times. However, when a Time Lord's thirteenth body starts to die, an automatic regeneration attempt will occur. In "The Twin Dilemma" Azmael attempts to regenerate a thirteenth time, but dies instead.BTW,it wasen't REALLY the was a robot Desienged to look like the doctor and when he "Regenerated" it was just a "light show"

(It is explained in the BBC novels, that The Master attempted a thirteenth regeneration, but rather than die ended up in his "The Deadly Assassin" form.)

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