The twist, which saw Oswin converted into a Dalek who seemingly died at the end of the episode, confused viewers since Coleman's companion character is called Clara. The first two incarnations, Oswin Oswald and Clara Oswin Oswald, each die during the episode in which they appear. The actress confessed that she was not totally informed about Victorian history, but researched the role.
She added that there are "some absolutely stunning, beautiful, very magical" moments in the Christmas episode. Spall on how he blew chance to play the Doctor. The Cry. Radio Times review.