"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 . 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. "Nisei" earned a Nielsen household rating of 9.8, being watched by 16.36 million people in its initial broadcast. The episode received largely positive reviews from critics.