Patty is lying awake one night in a church basement, distraught and scared. She is to be executed the next morning for refusing to take the Mark of the Beast. Patty knows what lies ahead if she takes the mark but can still not believe in Christ.When those around her try to comfort her and encourage her to accept the Lord, she lashes out at them.

Patty, a young woman caught up in living for the present with little concern for the future, awakens one day to find her husband missing and the radio reporting that millions of people around the globe have mysteriously vanished. As dramatic, earth-shaking events begin to unfold around her, Patty realizes she is living in the end times spoken of in biblical prophecy.

Third and best known entry in the Mark IV series of fundamentalist apocalypse films. Fundamentalist Christian guerrilla David helps condemned dissidents escape, attempts to subvert the computerized Mark of the Beast, and generally tries to survive as prophecy unfolds in the rise of the Antichrist to the pinnacle of his power and the beginning of God's war on sinful man.