Mulder and Scully pursue an unbalanced scientist whose research has caused his shadow to become deadly.
Alie (recurring guest star Erica Cerra) forces Raven's dark side to come out, while Jasper's anger continues to grow. Meanwhile, Octavia wrestles with her place in the world, and Monty is forced to make a split-second decision.
As the search for a cop killer intensifies, Tony begins to doubt his own recovery.
Tony uncovers the shakedown ofa community of illegal immigrants; David wants an earring to impress a girl.
Thinking they might actually be able to defeat this unseen foe, Wes convinces the President to let him round up all of the children in a protected zone in the hopes that Drill will weaken.
