The Seventh Day (2021)

Father Peter, a prestigious exorcist, teams up with Father Daniel, a young and inexperienced priest, on his first day of work. They try to stop the demonic possession of a young boy named Charlie.

While performing the exorcism on Charlie and seeing his arms slowly develop burn marks resembling other exorcisms, Father Daniel realizes that Father Peter is actually possessed and redirects his exorcism prayer towards Peter. In a violent struggle, Father Daniel kills Father Peter with his crucifix. As the demon leaves his body, Peter thanks Daniel before dying.

Father Daniel brings Charlie to the Archibibishop where Charlie undegoes a second successful exorcism. Father Daniel leaves Charlie with the Archbishop, who promises to take care of him. The Archbishop and Father Daniel realize every priest recruit who worked under Father Peter has been possessed by a demon, creating a network of demonic priests that is quite sizable. The Archbishop provides a list of all those priests to Father Daniel who will carry on with those exorcisms. Shown as the first one is Father Dunleavy. Daniel starts his car to begin his mission.