The first serial of the series, "The Giants", was originally to be written by C. E. Webber, the first episode being titled "Nothing at the End of the Lane", and would concern the four main characters (at that point named as the Doctor, Cliff, Lola, and Biddy) being shrunk to a "miniature size" and attacked by giant animals. The episode would have revealed that the Doctor had escaped from "his own galaxy" in the year 5733, seeking a perfect society in the past, and that he was pursued by agents from his own time who sought to prevent him from stopping their society from coming into being. By May 1963 a storyline for all four parts had been established and the first two episodes scripted. However, the story was rejected on 10 June 1963 on the grounds that the story was too thin on characterisation and that the giant monsters would be clichéd and too expensive to produce. Some of the initial opening script was retained for "An Unearthly Child" when Anthony Coburn was commissioned to write a replacement on 14 June 1963, though details like those about the Doctor's home were removed. Around early September 1963 the idea was given to Robert Gould to develop, referred to as the "miniscule" storyline, which was anticipated to be the fourth serial of the season, but this story was later dropped from this slot in January 1964 and Gould abandoned work on the story altogether a month later. In March 1964 the story idea was offered to writer Louis Marks and eventually became "Planet of Giants".