"Nisei" is the ninth episode of the third season of the American science fiction television series The X-Files. It premiered on the Fox network on November 24, 1995. It was directed by David Nutter, and written by Chris Carter, Frank Spotnitz and Howard Gordon. "Nisei" featured guest appearances by Steven Williams, Raymond J. Barry and Stephen McHattie. The episode helped explore the series' overarching mythology.