Marlon Brando portrays a fearless, sharp-shooting character in "The Missouri Breaks." The story centers on a wealthy Montana rancher (John McLiam) in the late 1800s who hires an unusual assassin (Marlon Brando) to deal with a gang of rustlers led by Jack Nicholson, whose activities are severely impacting his profits. Arthur Penn's "The Missouri Breaks," featuring Brando and Nicholson, was considered a failure u…