Exorcism
In Christianity, exorcism is the practice of casting out demons. In Christian practice the person performing the exorcism, known as an exorcist, is often a member of the Christian Church, or an individual thought to be graced with special powers or skills. The exorcist may use prayers and religious material, such as set formulas, gestures, symbols, icons, amulets, etc. The exorcist often invokes God, Jesus and/or several different angels and archangels to intervene with the exorcism. Protestant Christian exorcists most commonly believe the authority given to them by the Father, Son, and Holy Spirit (the Trinity) is the source of their ability to cast out demons.
Pazuzu (The Exorcist)
In "The Exorcist" television series, Pazuzu in its natural form is portrayed by Robert Emmet Lunney. Its victims are an older Regan, portrayed by Geena Davis, and Regan's daughter Casey, portrayed by Hannah Kasulka.