Screenrant's 10 Great Movies Where the Heroes Were the Villains All Along

"After a movie has established a particular person as its hero or protagonist, it can come as quite a shock when the opposite turns out to be true. Whatever the circumstances of the twist, movies that showcase heroes turning out to be villains have the potential to carve out new paths in dramatic movie storytelling. Indeed, many of the movies with the biggest plot twists involve the hero somehow transforming into the antagonist. Apart from surprising audiences, these movies also have the potential to raise important questions about morality. Moreover, every film hero that turns out to be a villain instills valuable lessons in viewers - teaching them to expect the unexpected, and possibly shifting their perception of what it takes to be a hero. In any case, great movies where the heroes were villains all along are memorable not just for how the twist happens, but also for the introspective thoughts and moral dilemmas that they leave behind." - screenrant.com