Clara Oswald
Clara is introduced a second time in the 2012 Christmas special "The Snowmen". This was her first episode as the Doctor's companion. She was a young barmaid and governess in 1892. She follows the Doctor after he saves her from an attack by living snowmen. The Doctor asks her to travel with him after she enters the TARDIS, his time and space machine. Soon after this, Clara falls to her death after being attacked. Her tombstone shows her full name to be Clara Oswin Oswald. The Doctor sees that she is the same woman as Oswin from the Asylum. She even says the same things Oswin had said. Intrigued by a woman who has lived and died two times in different periods of history, he begins look across time for another Clara. The episode ends with a young woman, who could be a modern-day Clara, walking through the graveyard and stopping by Clara Oswin Oswald's tomb. In a short prequel to the post-Christmas episode, the Doctor meets the modern Clara Oswald as a child, but he does not know it is her. In "The Bells of Saint John", the modern Clara meets the Doctor after being given his phone number by a woman in a shop. After an adventure in London, the Doctor asks Clara to become his companion. In "The Rings of Akhaten", the Doctor tries to learn more about who (or what) Clara really is. After watching her parents and her childhood, he finds nothing that is not normal. The episode shows that her mother died when she was a teenager. In "Hide", the Doctor goes to a haunted mansion to ask the psychic Emma Grayling about Clara. She says Clara is just an ordinary girl. "Hide" and "Journey to the Centre of the TARDIS" also show that the TARDIS does not like Clara. In a version of time which was stopped from happening, the Doctor talks with Clara about the two previous versions of her he had met. She did not know what he is talking about.