Thanks to the rather exciting Julie d'Aubigny, the Doctor defeated an infestation of cosmic darkness in Paris, France, in 1695.
Though Julie was interested in joining the Doctor on his travels - as long as she got to drive! - the Doctor has left her to get on with her own adventures for the time being. Perhaps she'll be back for seconds in the future...? In the meantime, there are always new adventures to be had, and new people to meet!