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Originally Posted by zorcarepublic Easy. |
But the Doctor never visited Queen Victoria until only last year! That would be long after the POD.
And you haven't answered the question: "Where is the parallel Earth Doctor?"
In fact, the problem here is that the writers have mixed up two incompatible ideas about time travel.
Historically, Doctor Who, and most old SF stories, always view time as linear. It is a fixed line that you can go forward or backwards along. You cannot actually change something in the past, because it was always destined to happen that way.
Or, if you do change something, you change everything that comes afterwards irreversably.
Modern physics with wormholes, superstring theory, up to 13 dimensions, and parallel worlds has been embraced by some modern writers and some TV shows - Sliders, for example. Passing between dimensions, relativistic time travel to the future might be possible, but travelling backwards in time would not be.
As I always say, if they invent Time Travel in the future, where were all the Time Tourists in the past?