Rose Tyler is a fictional character in the British science fiction television series Doctor Who. She was created by series producer Russell T Davies and portrayed by Billie Piper. With the revival of Doctor Who in 2005, Rose was introduced as a new travelling companion of the series protagonist, the Doctor, in his ninth and tenth incarnations. The companion character, intended to act as an audience surrogate, was key in the first series to introduce new viewers to the mythos of Doctor Who, which had not aired regularly since 1989. Rose became the viewers' eyes into the new world of Doctor Who, from the companion's perspective. Piper received top billing alongside Christopher Eccleston and David Tennant for the duration of her time as a regular cast member. A regular for all of series one (2005) and series two (2006), Piper later returned for three episodes of the programme's fourth series (2008) and appeared in feature-length specials in both 2010 and 2013. In 2013, Piper played a different character for the 50th anniversary known as 'The Moment', projecting Rose's image in her 'Bad Wolf' form.