bomb, destroying the house and the invading Daleks, and correcting the course of the future. The Doctor tells Styles that he must make the conference a success, because they know what will happen in the future if they fail. Production Working titles for this story included The Ghost Hunters and Years of Doom. As originally written, the serial revolved around the Ogrons instead of the Daleks. It was planned to bring the Daleks back at the end of the season, in a serial called The Daleks in London by Robert Sloman. This plan was dropped when the production staff realised that the show would not have a hook to entice viewers (after the Third Doctor's introduction in Season 7 and that of the Master in Season 8), and Sloman's serial was allegedly shaping up to be too similar to The Dalek Invasion of Earth. Instead, writer Louis Marks was asked to alter his serial to include the Daleks. Osterley Park was originally proposed as the setting and location for Day of the Daleks. The name was changed to Auderly House in the finished programme and renamed Austerly House in the novelisation. Jon Pertwee, who would later say, "I have never liked the Daleks", felt that the monsters were very limited and could not understand their popularity. However, he would concede that the publicity which followed the announcement of their return to the series by Barry Letts "was perhaps worth my biting my lip". On the other hand, he enjoyed working with the story's guest cast. He also liked the Ogrons, as unlike the Daleks, their design allowed the actors' mouths and lips to be seen and thus he felt allowed the actors playing them to "come to grips" with their characters and "with an entire range of expressions available" make the viewers believe in their performance. Pertwee also recalled he persuaded Barry Letts to include the trikes seen in the story, reflecting his love of vehicles. However he considered the chase sequence involving them to be "one of the more dangerous stunts that I had insisted on doing" during his time on the series. Terry Nation, who penned the first story The Daleks in 1963, was given an on-screen credit at the end of all four episodes of this story as having originated them. The production team only had three Dalek props available for use during the production of this