Season: 4
Air Date: 5/18/97

X-Files always delivered come finale time, but the emotionally charged "Gethsemane" stands out amongst the pack, thanks to the reveal that the alien presence may indeed be a hoax. As if that weren't enough, a shadow of a doubt is also cast upon the disappearance of Mulder's (David Duchovny) sister, and the episode ends with his [apparent] death. Many consider the following years to be wildly uneven, all the more reason to treasure "Gethsemane."