El Dorado is a 1966 American Western film produced and directed by Howard Hawks and starring John Wayne and Robert Mitchum. Written by Leigh Brackett and loosely based on the novel The Stars in Their Courses by Harry Brown, the film is about a gunfighter who comes to the aid of an old friend—a drunken sheriff struggling to defend a rancher and his family against another rancher trying to steal their water. The gunfighter and drunken sheriff are helped by an aging Indian fighter and a young gambler. The supporting cast features James Caan as the young gambler, Charlene Holt, Ed Asner, Paul Fix, Arthur Hunnicutt, Michele Carey, and Christopher George.