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Steven Moffat did want Christopher Eccleston to be in the 50th Anniversary Special. Afetr talks with him, however he was unable to persuade Eccleston to take part. It is generally thought that Christopher Eccleston was unhappy with his time on the show, and also that he dislikes going back to old roles he has played in the past. Some old footage of Eccleston was edited in(during the Gallifrey sequence at the end).