It was first mentioned in Tom Baker's The Deadly Assassin, to give a reason why The Master was after the Eye of Harmony (to extend his lifetime).Originally Posted by Hursticon
Griffin is right, they kind of shot themselves in the foot by placing a limit on regenerations, lol, does anybody know which Doctor stated it? by memory I think it was between the 3rd and 5th Doctors though I could be wrong.
From Wikipedia:
It is first stated in The Deadly Assassin (1976) that a Time Lord can regenerate twelve times before dying (thirteen incarnations in all). There are exceptions to this rule....
http://en.wikipedia.org/wiki/Regeneration_(Doctor_Who)
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