High Quality Content by WIKIPEDIA articles! "Gethsemane" is the fourth season finale of the science fiction television series The X-Files. The episode first aired in Canada and the United States on the Fox network and subsequently aired in the United Kingdom on Sky1. Fox Mulder (David Duchovny) discovers the ultimate proof of extraterrestrial life while Dana Scully’s (Gillian Anderson) cancer gets worse, but she may not be the agent whose life is over.