Cacoyannis made a number of changes to Iphigenia at Aulis in order to adapt it to modern cinema, some of them significant divergences from the original plot. Cacoyannis does away with the traditional Greek tragic chorus originally employed to explain key scenes, replacing it in some cases with a chorus of Greek soldiers. He adds new characters who were not present, but who were mentioned, in the original play, Odysseus and Calchas, to further the plot and voice certain themes.
