"Tooms" is the twenty-first episode of the first season of the American science fiction television series The X-Files. It premiered on the Fox network on April 22, 1994. "Tooms" was written by Glen Morgan and James Wong, and directed by David Nutter. The episode featured Mitch Pileggi's first appearance as Assistant Director Walter Skinner, and saw Doug Hutchison and William B. Davis reprise their roles as Eugene Victor Tooms and The Smoking Man, respectively.