When a deadly, viscous organism is discovered inside a strange rock, the agents race to determine the rock's origin.
The agents investigate a ministry led by a man whose son possesses the power to heal -- and to kill -- with a touch of his hand.
Mulder and Scully are exposed to the ancient ritual of exorcism while investigating a young boy possessed by evil.
To gain tangible proof the organism inside the rock is an alien entity, Mulder joins forces with the duplicitous Krycek and comes face to face with the starling depths of his deception.