AN ATTACK ON A NEW JERSEY SEWER WORKER LEADS MULDER TO SUSPECT A MUTANT LIFE FORM HIDING IN THE BOWELS OF A SEWAGE PLANT.
Assistant Director Walter Skinner sends Mulder to investigate a corpse found in a New Jersey sewer. Still angry about the closing of his X-Files, Mulder confronts his boss over the meaningless, make-work assignments he is being given. But Scully's autopsy of the corpse reveals the presence of a mutated parasite capable of growing to human size. When other workers are attacked by a sewer-dwelling monster, Mulder must track down a killer spawned in the belly of Chernobyl itself.