 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 <unk> his work . In the episode , Assistant Director Walter Skinner ( Mitch Pileggi ) and Michael Kritschgau ( John Finn ) work desperately in an attempt to discover what is wrong with Mulder , who is imprisoned by his own <unk> brain activity , but they are unaware of Agent Diana Fowley ’ s ( Mimi Rogers ) duplicity . In the meanwhile , Scully is hunting for an ancient artifact in Africa . 
