Promoted with the tagline "Tonight, they get carried away... On a doomed voyage, the passion between Mulder and Scully is finally unstoppable", "Triangle" premiered on the Fox network in the United States on November 22, 1998. The episode earned a Nielsen rating of 10.8, with a 16 share, meaning that roughly 10.8 percent of all television-equipped households and 16 percent of households watching television were tuned in. It was viewed by 18.2 million viewers.Meisler (2000), p. 294. "Triangle" was the 18th most watched television program for the week ending November 22. The episode aired in the United Kingdom and Ireland on Sky1 on March 21, 1999, and received 0.74 million viewers, making it the fourth most watched program that week. Note: Information is in the section titled "w/e March 15–21, 1999", listed under Sky1
