Mitch Pileggi - "X-Files"

Some trivia about the scene:
Pileggi was given only a few days' notice that he, as Skinner, would be wearing only underwear – dressed in jockey shorts, rather than boxers – in one scene of "Zero Sum". The last-minute notification allowed Pileggi just enough time to do some exercise in a weight room and whip his physique into shape, in preparation for Skinner's scantily clad appearance. (I Want to Believe: The Official Guide to The X-Files, volume 3)