"Surekill" is the eighth episode of the eighth season of the American science fiction television series The X-Files. It premiered on the Fox network on January 7, 2001. The episode was written by Greg Walker and directed by Terrence O'Hara. "Surekill" is a "Monster-of-the-Week" story, unconnected to the series' wider mythology. The episode received a Nielsen rating of 8.0 and was viewed by 13.3 million viewers.