Russell Crowe’s Master and Commander is based on a book series, but despite so much material available for adaptation, it has no sequel. Master and Commander is one of many standalone movies with great sequel potential that have not continued their stories, but for a war movie, this is not surprising. The best war movies of all time often don’t get sequels given the nature of their stories, which are usually self-contained. Still, there are many other reasons why a successful movie would not have a sequel.