Jesus Christ returns to modern-day New York City to fulfill biblical prophecies and usher in 2000 years of godly peace. When he discovers that he is unable to relate to modern youth, he dons a superhero costume and appears to the world as Ultrachrist!
A young boy named Karl Berger (a surname given in the sequel) murders his abusive mother with a meat cleaver, after she beats him for returning home late. Twenty years later, in the mid-1970s, the imprisoned Karl is being transported to an unspecified location by the police, but manages to kill his captors and escape into the wilderness, somehow acquiring a cleaver in the process. Over the course of several days, Karl commits a series of murders across the countryside, mutilating and occasionally cannibalizing his victims. After one double homicide, Karl faints and has a flashback to the day he murdered his mother, revealing he had been coerced into killing her by a demon (which a line of dialogue indicates may be his father) he had encountered in the cellar after being locked in it.
The film starts with animated visualizations, film segments and stock footage, a cartoon and audio quotes about spirituality by Chögyam Trungpa Rinpoche, then shots of war, explosions, and the September 11 attacks. Then the film's title screen is given. The introduction ends with a portion of a George Carlin monologue on religion accompanied by an animated cartoon. The rest of the film is in three parts with narration by Peter Joseph.