Season 5 Episode 15 - Travelers 

In 1990 Agent 여우 Mulder visits an aging FBI Agent Arthur Dales and listens to a story of the agents assigned to a would-be X-File in the Cold War era of the 1950's and how Mulder's father was connected to a series of strange deaths.
키워드: x-files, scully, mulder, full episode, season 5, episode 15, travelers, 5x15