This is THE most underrated horror of all time.Basically this film is where part two should be as it totally ignores it.
It is a highly intelligent film made by William Peter Blatty because he was disappointed with the original. It is based on his book Exorcist:legion.
It stars George C Scott, and he gives a spectacular performance. I won't tell you any of the story except it takes place 20 years after the original.
This film is brilliantly scripted, directed, acted.. Basically I feel it is a perfect horror, It is very frightning, very intense, and very well thought out. Unlike virtually all others.
I fell that this surpasses number one as a better film. (although a classic the original was too 'bitty' and inconsistant in its pace)See this film, I implore you if you want to see a great horror film.