 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 . Mulder is a believer in the paranormal , while the skeptical Scully has been assigned to debunk his work . In the episode , Mulder goes to the Arecibo Observatory in Puerto Rico to continue his search for proof on extraterrestrial life . Meanwhile , Scully attempts to aid him after being separated following the closure of the X @-@ Files . 
