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In Season 3 of the the revived Doctor Who, the Doctor and Martha Jones go back in time to 1599 London, where they defeat the villainous Carrionites, who were most likely going to destroy, or at least take over, Earth. With all that not happening in the events of "Turn Left," why doesn't the world end?

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Well, the world still existed before the Doctor went back to beat up the Carrionites, so apparently they just cancelled the appointment when he didn't show. – Radhil 6 hours ago
    
Can you please explain why you believed the world should have ended? – Wikis 3 hours ago

It is true that, in the Turn Left universe, the Doctor died during the events of The Runaway Bride and so was not able to take part in any of the events shown in seasons 3 and 4. So he could not have helped to foil plan of the Carrionites that is described in the Season 3 episode The Shakespeare Code.

The only logical answer is that the Carrionites plan failed for some other reason. Perhaps Shakespeare figured it out on his own. Or perhaps the Carrionites were distracted by a butterfly that Martha would have stepped on if she had been there.

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It's basically a grandfather paradox.

  • The alternate timeline of Turn Left was created when Donna chose to turn right instead of left.
  • If the world had ended in 1599, then Donna would never have been born.
  • So, she would not have been able to make the decision to turn left or right.
  • So, the alternate timeline could not have been created.
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