In the upcoming horror sequel, “The Exorcist: Believer,” fans can expect a spine-tingling twist as dual possessions grip two different families. The latest trailer takes a haunting trip down memory lane as Ellen Burstyn’s character confronts a demon eerily reminiscent of the one that plagued her daughter in the 1973 classic. With a new release date set for October 6, this trilogy promises to reawaken terror in fans of the original.