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.
In 1905, after 10 years of missionary work in Africa, the Rev. Charles Fortesque is recalled to England, where his bishop gives him his new assignment - to minister to London's prostitutes.
The Titanic disaster as seen through the eyes of one couple in each of the three classes on board.