 " Irresistible " is the thirteenth episode of the second season of the American science fiction television series The X @-@ Files . It premiered on the Fox network on January 13 , 1995 . The episode was written by series creator Chris Carter , directed by David Nutter , and featured the first of two guest appearances by Nick Chinlund as the death fetishist killer Donnie Pfaster . The episode is a " Monster @-@ of @-@ the @-@ Week " story , a stand @-@ alone plot which is unconnected to the series ' wider mythology . The episode was viewed by 8 @.@ 8 million people upon its first broadcast , and received positive reviews , with much praise to Chinlund 's performance as the antagonist . 
