Review by nageshphaniraj

The doctors, believing that Regan's aberrations are mostly psychological in origin, recommend an exorcism be performed. Chris arranges a meeting with Karras who, reluctant to engage spirtually, agrees to at least speak with Regan. As the two come face to face Karras and Regan test each other's wits, although Karras is skeptical to believe anything spiritual is happening. Chris tearfully finds herself at a dead end and confides in Karrass that Regan was the one who murdered Dennings, and begs him to find a solution. Over the next couple days Karrass witnesses Regan speaking backward in different languages, and exhibits scars spelling out "Help Me" on her stomach, convincing him she really is possessed by a demon. He implores the church to let him perform an exorcism, but feeling he's over-matched the church calls on Merrin to perform the exorcism while Karras may assist.

The ritual begins as a battle of wills with Regan performing a series of horrific, and vulgar acts. They attempt to exorcise the demon, but the spirit digs in, claiming to be the Devil himself