"4-D" is the fourth episode of the ninth season and the 186th episode overall of the American science fiction television series The X-Files. The episode first aired in the United States on December 9, 2001, on the Fox network. It was written by Steven Maeda and directed by Tony Wharmby. The episode is a "monster-of-the-week" episode, a stand-alone plot which is unconnected to the mythology, or overarching fictional history, of The X-Files. The episode earned a Nielsen rating of 5.1 and was viewed by 5.38 million households. It received mixed to positive reviews from television critics.

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