In this episode Mark talks about one of his favourite TV shows: the American science fiction drama television series "The X-Files" created by Chris Carter. The series mainly revolves around Federal Bureau of Investigation (FBI) special agents Fox Mulder (played by David Duchovny) and Dana Scully (played by Gillian Anderson) who investigate so called "X-Files": which are usually unsolved cases involving paranormal or supernatural phenomena and/or invididuals. When the series first begins Fox Mulder is more of a true believer in the existence of paranormal phenomena and extraterrestrial life being the source of the cases they investigate, whereas Dana Scully is more skeptical and looks for a more rational and scientific theory to answer the mysteries that they are presented with; however, as the series progresses, both the belief of Mulder and the faith of Scully, as well as their relationship to one another, is tested in many ways. The theme of the 218 produced episodes, over 11 seasons, as well as the two motion picture releases, range from "monster of the week" to the grander series arc of a secret government conspiracy and the potential of an impending total alien invasion of Earth.