Thirteenth Complex

Thirteenth Complex is a rare Time Lord disease that only occurs in a Time Lord's 13th and final incarnation, in which the Time Lord is forced into their own mind, with all their other incarnations fighting for control over the body. If a decision is reached, with one incarnation being voted or decided as the best controller for the body, the Time Lord changes back to that incarnation. Tristan Cox got this disease, but due to being only half Time Lord, there were only two of him in his mind. Eventually, the two forced a stalemate by causing Tristan to regenerate again.

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