Horrible and Fascinating - John Boorman's Exorcist II

In 1973, The Exorcist shocked the world and became the most popular and successful horror film ever made.
In 1977, Exorcist II: The Heretic shocked the world in a very different way...becoming a laughing stock.
How did it happen? Why did a major motion picture studio entrust a man who hated The Exorcist with the job of making Exorcist II? Why did making the film almost KILL its director? What caused enraged audiences to riot and pull ticket booths out of the ground? Why was Exorcist II re-edited after its release and how can the multiple editions of the film be told apart? Is Exorcist II really one of the worst films ever made? Did it wreck the career of its headlining star? And what does the man who made The Exorcist think of the sequel that tried to "correct the damage" of his landmark film?
The answers to these and many other questions are answered in the horrible and fascinating story of a film that has bedeviled horror movie fans for over 40 years...