The Exorcist is an American supernatural horror film which is worldwide popular for the suspense and thrill created by the director William Friedkin. This film was based on a true story which happened in 1949 in the exorcism case of Roland Doe, a 12 year old girl who was demon possessed and her mother calls two priests who could conduct prayers and rituals to free her from the satanic bondage. In this story, the little girl named Regan is demon possessed and her outward appearance changes day by day to look even more terrific and horrible.

                   American Horror Film

Initially, she was taken to the medical laboratory for several investigations but her sickness was beyond the reach of a medical doctor. On observing the character change and the behavioral difference, her mother who was a visiting actress in Washington D.C. sought the help of two priests to deliver her daughter from strong evil forces. This film is considered to be one of the famous and best horror movies of all time and it is a must watch movie on Halloween.