Appaloosa is an upcoming Western film based on the 2005 novel Appaloosa by crime writer Robert B. Parker. The film is directed by Ed Harris and is co-written by Harris and Robert Knott. Appaloosa stars Harris alongside Viggo Mortensen. The film premiered in the 2008 Toronto International Film Festival, will be released in select cities on September 17, 2008 and will expand into wide-release on October 3, 2008.