Oswin Oswald is introduced in the series 7 premiere, "Asylum of the Daleks" (2012). She is the sole survivor of the starship Alaska, which crashed on the Asylum, a prison planet for insane Daleks. Oswin then learns from the Eleventh Doctor (Matt Smith) that she has been converted from human into a Dalek and has coped by retreating into a fantasy of her own intact survival. She assists the Doctor and his travelling companions, Amy Pond (Karen Gillan) and Rory Williams (Arthur Darvill), to escape the planet unharmed, but at the cost of her own life. Later, in the 2012 Christmas special "The Snowmen", the Doctor meets a woman named Clara Oswin Oswald, whom he initially knows only as Clara. She is a Victorian barmaid and governess whom the Doctor invites to be his newest companion, but who dies from an attack by one of the Great Intelligence's minions. Seeing her full name on her tombstone and finally recognising her voice, the Doctor realises she is the same woman as Oswin from the Dalek Asylum, whom he had never seen in her human form. Intrigued by the mystery of the woman who has lived and died twice in different eras, he begins searching across time for another Clara.