1. Superman IV: The Quest For Peace (1987)
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You will believe a man can't fly! Start with one of the greatest movie series of all time. Take a ridiculous concept placing Superman against a real-world problem he can't possibly win. Write a story with multiple plot holes, then take a bunch of elements from the first two movies and re-insert awkwardly into one film. Finally, sprinkle on extremely bad blue-screen and special effects. Viola! You now have the greatest franchise-destroying, career-stalling, cringe-inducing turkey of all time.