 The show centers on FBI special agents Fox Mulder ( David Duchovny ) and Dana Scully ( Gillian Anderson ) who work on cases linked to the paranormal , called X @-@ Files . In the episode , Mulder and Scully investigate a death fetishist who begins kidnapping and killing women to satisfy his obsession . Scully , still recovering from her earlier abduction , is soon overcome with <unk> stress disorder . 
