The nastiest plot twist is not a secret sibling or a conveniently forgotten murder—it is discovering that the hero has been the real threat all along. These movies force their protagonists to reconsider every noble mission, justified sacrifice and suspiciously large body count with suddenly clearer eyes. Sometimes the truth arrives in one brutal reveal; elsewhere, the audience has been yelling it at the screen for an hour. Either way, realizing you are the villain makes saving the day rather awkward.
