Dr. Gene Tuskin helps troubled children, including Regan MacNeil, who struggles with bad dreams and repressed memories of a demon possession. His mind-linking device reveals the demon Pazuzu still resides within her, eager to resurface and wreak havoc. Father Philip Lamont is tasked with investigating Father Merrin's death, which occurred during an exorcism on Regan. Lamont's inquiry takes him to Africa, where he uncovers a dark secret about locusts and the ongoing battle between Good and Evil.

Exorcist II: The Heretic
A woman's dark past comes back to haunt her as a malevolent force returns, prompting a priest to delve into the mysterious death of the exorcist who previously attempted to free her from its grasp.