Whedon had been writing a movie script about the "Firefly" series for Universal Studios. When the television series came out on DVD, the sales of the DVD were good enough to make sure the movie could be produced. In early 2004 Whedon said that a "Firefly" movie had been accepted by Universal, and shooting started in July 2004. The movie, called "Serenity", was in movie theaters in the United States on September 30, 2005. It was well liked by critics and fans, but did not make much money in theaters.