the TARDIS to speak to each other. Graham's two-parter was intended to lead into "A Good Man Goes to War", the mid-series finale, but have a main plot about "avatars that rebel". Graham took Moffat's pitch and added many of his own aspects, such as the monastery setting and the Flesh. Then, in addition to revealing who River Song is, "A Good Man Goes to War" presented the situation of the Doctor, who was typically a pacifist, being provoked enough to assemble an army. Moffat described the ending as "game-changing cliffhanger" and split the series in two because such a climax could not be done at the end of a series, as it would be "too long before it came back". The mid-series premiere, "Let's Kill Hitler", was intended to be the opposite of the "grim and dark" tone of the series premiere. Mark Gatiss wrote "Night Terrors" to be a scary episode, surprised that dolls had not been used in Doctor Who before. "The Girl Who Waited" is a "Doctor-lite" episode, an episode in which the actor playing the Doctor is not required for much of the shooting, which allowed Tom MacRae to explore Amy and Rory's characters and relationship. The concept of "The God Complex" was originally pitched by Toby Whithouse for the fifth series, but it was pushed back as Moffat felt that it was too similar to the stories in that series. The penultimate episode, "Closing Time", is a sequel to series five's "The Lodger" and allows the Doctor to have some fun while building up to the finale. Writer Gareth Roberts also wanted to bring back the Cybermen, as there were no other returning monsters in the series and he thought "there should be a sense of history about the Doctor's final battle to save Earth before he heads off to meet his death". The finale was described by Moffat as "a big roller coaster ride of Doctor Who madness" and concludes the Doctor's death arc, though it intentionally leaves some mysteries. Music Murray Gold composed the soundtrack to this series, with orchestration by Ben Foster. Filming "Night Terrors" was the first episode of the series to be filmed in September 2010. It was mainly filmed on a council estate in Bristol, with some scenes filmed in Dyrham Park. Production of "The Doctor's Wife" also occurred in September, with some in October. The two-part opening