Ep 10. Tithonus

In The X-Files season 6 episode 10 titled Tithonus, Mulder and Scully investigate a series of murders in which the victims are all elderly men. Their search leads them to the home of a seemingly reclusive photographer, Alfred Fellig, who has been known to take photos of crime scenes. Despite Scully's skepticism, Fellig claims to have photographed Death, or at least the moment right before it takes a person's life.

Fellig suffers from a rare condition that makes him immortal, unable to age and therefore doomed to a never-ending existence. He has become disillusioned with his immortality and longs for death, seeing it as a release from his curse. During their investigation, Mulder and Scully become aware of Fellig's secret and he confides in them that he believes Death has finally come for him.

Mulder, having experienced his own brush with immortality (in the season 3 episode "Clyde Bruckman's Final Repose"), becomes intrigued by Fellig's immortality and begins to investigate him further. To complicate matters, the detectives who had been assigned to the case initially, including one who had been romantically involved with Fellig, begin to suspect that he may be the killer. Mulder and Scully must race against time to solve the case before Fellig becomes the next victim.

As the investigation progresses, Fellig's immortality and belief in the inevitability of death are explored in depth. The episode touches on themes of life, death, and aging, and the human need to find meaning in mortality. Mulder, who has previously questioned the existence of immortality, begins to understand the weight of Fellig's burden and the gravity of his own search for the truth.

The climax of the episode finds Mulder and Scully in a race against Death itself, as they attempt to save Fellig from the killer and possibly even grant him his greatest wish. The episode ends on a somber note, with Mulder reflecting on Fellig's life and the weight of immortality, as Scully reminds him that their search for the truth is ongoing.