Season 10, Episode 03 – Thin Ice
In Regency England, beneath the frozen Thames, something is stirring. The Doctor and Bill arrive at the last of the great frost fairs and find themselves investigating a string of impossible disappearances – people have been vanishing on the ice! Bill is about to discover that the past is more like her world than she expected, and that not all monsters come from outer space.
The Doctor is an alien Time Lord from the planet Gallifrey who travels through all of time and space in his TARDIS. He has a long list of friends and companions who have shared journeys with him. Instead of dying, the Doctor is able to “regenerate” into a new body, taking on a new personality with each regeneration. Twelve actors, plus John Hurt, have played The Doctor thus far.