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I am pretty sure that the aliens didn't trigger the Doctor's head to explode; I think it exploded because he was using all of his considerable smarts to resist them, and the fight escalated to exploding head. In light of the chess player in the second episode, who also resisted them (both of them noting that they could feel 'them' inside their heads), and also exploded, I don't think it's something that can be triggered, but instead happens when people with strong wills and intellect (and to whom those are defining characteristics) are invaded by the space ants. Thespian (talk) 16:08, 23 June 2016 (UTC)[reply]
But see, it speculates in the article, incorrectly as we have learned. To Wit: "Before he can be treated, the aliens in his head trigger his brain to swell and explode, killing him." Which is also original research, and that was what I was trying to bring up. Thespian (talk) 11:06, 1 July 2016 (UTC)[reply]