Mulder and Scully investigate on a case where a residue was all that was left of a victim's body. Their investigation takes them to a chemical testing plant where a physics doctor who was involved in a freak accident, has now turns his shadow into a deadly weapon.

Professor Xavier's step-brother, and sworn enemy, the Juggernaut loses his powers to a bumbling archeologist. He must overcome the pain of their childhood together, and have the powers restored to him to save his life.