Previously on rec.arts.sf.tv.babylon5.moderated, Duggy said:

> > Tennant's Who did not
> > know the Prof except for that one story.  Her past with The Doctor is
> > in The Doctor's future.
> 
> No, her past was with the David Tennant Doctor... clearly, now,
> missing stories, but she clearly recognized him and was surprised that
> this was their first meeting.  Professor Riversong was with the 10th
> Doctor, not the 11th.

It's been shown before that some people can recognize The Doctor across
regenerations, and I believe that at least some of those have not been
other Time Lords.

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