 The show centers on FBI special agents Fox Mulder ( David Duchovny ) , Dana Scully ( Gillian Anderson ) and John Doggett ( Robert Patrick ) who work on cases linked to the paranormal , called X @-@ Files . In this episode , Mulder secretly conducts his own investigation after a man is gunned down on the White House lawn attempting to inform the President of a planned alien invasion . However , he is soon in over his head as he tries to expose further evidence of colonization . 
