Not sure -- yes the Master used up his 12, but we was able to use tech to steal Tremas' body, and "regenned" that way, and, apart from the fact that his entire body-morph has altered, this time he appears to use the artron energy of the Tardis, as opposed to his own physical energy.
Plotwise, they will do what they like, but canon-wise, I think we've an argument that says that he is simply piggy-backing onto other sources of energy. Which means *never* tell him about Cardiff.
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Not sure -- yes the Master used up his 12, but we was able to use tech to steal Tremas' body, and "regenned" that way, and, apart from the fact that his entire body-morph has altered, this time he appears to use the artron energy of the Tardis, as opposed to his own physical energy.
Plotwise, they will do what they like, but canon-wise, I think we've an argument that says that he is simply piggy-backing onto other sources of energy. Which means *never* tell him about Cardiff.