Who is the new Dr?

Last episode a new Dr. was introduced who is she? Where does she fit in the history or Drs.

This fan site says there will always be only one original Dr
https://doctorwhowatch.com/2020/02/04/doctor-who-william-hartnell-original-incarnation/

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RE:Who is the new Dr?

well from what i have heard sshe is going to be the last dr. but they did bring in a new one with this doctor witch seems like she is a past dr but he new one has no clue who she is

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