The exploits of FBI Special Agents Fox Mulder and Dana Scully who investigate X-Files: marginalized, unsolved cases involving paranormal phenomena. Mulder believes in the existence of aliens and the paranormal while Scully, a skeptic, is assigned to make scientific analyses of Mulder's discoveries that debunk Mulder's work and thus return him to mainstream cases.
Mulder and Scully investigate a dead body in the woods, and try to determine whether it was the work of a serial killer, an animal or a mysterious creature seen by eyewitnesses. Meanwhile, a disillusioned Mulder confronts some of his own demons.