The Eight Doctor also mentions that Time Lords can change species when they regenerate in the movie, so that particular life of his being half-human wouldn't be that unusual, especially since the regeneration was a difficult one.
Still, would their ability to change species be associated with the Eight Doctor or the Forth? We see Romana appear as different species earlier when she changes after all.
Still, would their ability to change species be associated with the Eight Doctor or the Forth? We see Romana appear as different species earlier when she changes after all.