by the Doctor in order to mould her into an ideal companion. Davies eventually wrote "Boom Town" to replace it when Abbott, after months of development, realised he was too busy to work on the script. The first series was Christopher Eccleston's only series in the role of the Doctor. Eccleston's contract was for a single year because at the time it was uncertain whether the show would continue beyond a single revival series. Eccleston's intent to leave was revealed on 30 March 2005, shortly after the broadcast of the first episode. The BBC released a statement, attributed to Eccleston, saying that he had decided to leave because he feared becoming typecast. On 4 April, the BBC revealed that Eccleston's "statement" was falsely attributed and released without his consent. The BBC admitted that they had broken an agreement made in January not to disclose publicly that he only intended to do one season. In a 2010 interview, Eccleston revealed that he left the show because he "didn't enjoy the environment and the culture that [they], the cast and crew, had to work in", but that he was proud of having played the role. Recurring and guest cast The character of Adam Mitchell was first conceived, along with Henry van Statten, during Davies' pitch to the BBC, in a story heavily based on Robert Shearman's audio play Jubilee called "Return of the Daleks". The production team had always intended for Adam to join the TARDIS after Rose developed a liking for him. To play this role, Bruno Langley was chosen, previously known for his role on Coronation Street as Todd Grimshaw. It was never intended for Adam to be a long-term companion, Davies wanted to show that not everyone is suitable to join the TARDIS crew and dubbed him "The Companion That Couldn't", he "always wanted to do a show with someone who was a rubbish companion". John Barrowman appears as Captain Jack Harkness, a character introduced in "The Empty Child", where he joined the TARDIS crew for the final five episodes of the series. In naming the character, Davies drew inspiration from the Marvel Comics character Agatha Harkness. Jack's appearances were conceived with the intention of forming a character arc in which Jack is transformed from a coward to a hero, and Barrowman consciously minded this in his portrayal of the character. Following on that arc, the character's debut episode