Many of the film""s major stars, including William Holden, Edmond O""Brien, Robert Ryan and Ben Johnson, were veterans of westerns with a more romantic view of the West in the 40s and 50s.Everybody got one.Sgt.Elias took charge of the deteriorating situation as the platoon reassembled to prepare their return:Knock it off! We got two men need attention here." He advised that they must be prepared for the ultimate day when the humans might leave the city and approach Ape City.It lent inspiration and was partly imitated by one of the greatest horror films of all time -The Exorcist (1973), and numerous other films about demonic children and impregnation, includingIt""s Alive (1974), the TV movieThe Stranger Within (1974),To the Devil a Daughter (1976, UK/W.