After Agent Mulder goes beyond his jurisdiction to shine light on a possible X-file, Doggett is assigned to investigate the mysterious disappearance of two men aboard an oil rig. Once he arrives, he finds Mulder has taken it upon himself to start his own investigation. Mulder soon becomes convinced that the rig is drilling the black oil. Doggett and Mulder must attempt to stop the spread of the alien virus while avoiding the infected crew.