 SPOILER: The film originally ended with the hero, Miles Bennell  (Kevin McCarthy) on the highway shouting to the people driving by  "Youre next, youre next!" But the studio wanted a "happier ending"  that would assure the audience that the heros efforts were not in  vain, so scenes were added to the opening to show Miles in a  hospital recounting his story to two other doctors and the scene at  the end when the other doctors find out about the pods and one of  them contacts the FBI.