The Exorcist isn't making you wait for the main event.
In episode 5 of the Fox series, airing Oct. 21, the show will mount a full-scale exorcism as Father Marcus and Father Tomas go up against the demon possessing Casey Rance -- and the resulting hour will change the show in a way no one will see coming.
In Mashable's exclusive preview, executive producer Jeremy Slater and episode writer David Grimm give us a look inside the show's scariest installment yet.
