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.
A mysterious dog thought to be the last of a rare Asian breed is responsible for several murders which Mulder and Scully are investigating. Now the agents have to find a way to stop the dog before it kills again.