The fourth-season finale of The X-Files was considered worthy of a TV Guide cover story. The episode itself, "Gethsemane," was, to no one's surprise, a cliffhanger, setting up a tense situation that would not be resolved until the opening installment of season five. Written by series creator Chris Carter, "Gethsemane" is predicated on a startling anthropological discovery that enables Mulder to irrefutably prove the existence of alien life forms. Unfortunately, this discovery results in a serious rift in the relationship between Mulder and his partner, Scully. Also brought into play: Mulder's tortured family history and the precarious state of Scully's health. "Gethsemane" first aired May 18, 1997.
by Hal Erickson synopsis