"The Exorcist" author William Blatty has sued Morgan Creek Productions for allegedly failing to pay him an agreed-upon fee for a recent sequel to the franchise. Blatty, in a suit filed Friday in Los Angeles Superior Court, seeks $750,000, the amount he was reportedly guaranteed if the studio made a second sequel to the original 1973 release. According to Blatty's attorneys, payment for sequels was covered in an October 1996 settlement agreement, which called for a $930,000 payment for a first sequel and a $750,000 payment for each subsequent release. Blatty contends that he was paid for the first sequel, 2004's "Exorcist: The Beginning," but not hte second, the recently released "Dominion: A Prequel to the Exorcist." Morgan Creek could not be reached for comment.