Mitch Pileggi is officially returning for ‘The X-Files’ Fox event series. He has been rumored to be returning for awhile and he confirmed it today via Twitter. Walter Skinner, whom Pileggi plays, is the only character, aside from Mulder (David Duchovny) and Scully (Gillian Anderson), to be apart of all nine seasons of the show and both of the films. Skinner was boss to Mulder and Scully, friend and sometimes enemy throughout the series.
Source: The Hollywood Reporter