The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a living—more of a hobby actually, and the Doctor's very, very good at it.
Halifax, West Yorkshire, England, 1832. Anne Lister attempts to revitalize her inherited home, Shibden Hall. Most notably for the time period, a part of her plan is to help the fate of her own family - by taking a wife.
When seven-year-old William receives a new favorite toy for Christmas, he discovers a lifelong friend and unlocks a world of magic.