Fifteen months before the BBC visited the set in May 1974, the Monty Python troupe assembled the first version of the screenplay. When half of the resulting material was set in the Middle Ages, and half was set in the present day, the group opted to focus on the Middle Ages, revolving on the legend of the Holy Grail. By the fourth or fifth version of their screenplay, the story was complete, and the cast joked the fact that the Grail was never retrieved would be "a big let-down ... a great anti-climax". Graham Chapman said a challenge was incorporating scenes that did not fit the Holy Grail motif.