 As both David Duchovny and Gillian Anderson were filming movies , Return to Me and The House of Mirth respectively , the production company decided to film " Hungry " before any of the other episodes , despite the fact that it would be aired third , after " The Sixth Extinction " arc . This allowed Duchovny and Anderson to film their scenes and complete their movies with relatively little hassle . Several of the finished scenes show Mulder and Scully together , but many of these scenes were created with stand @-@ ins and doubles because of the stars ' busy schedules . Duchovny and Anderson were only available for two combined days of filming for this episode . 
