sentences:  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.