A religious sect member capable of changing gender becomes the prime suspect in a murder spree.
Mulder and Scully pursue an unbalanced scientist whose research has caused his shadow to become deadly.
When "the Stream" -- an artificial system providing information to all society members through computer chips implanted in their brains -- begins to malfunction, an unlikely, "primitive" man may be the mankind's only hope.
During a high - profile serial murder case a old mentor of tony becomes involved with the case.
