Movies Special The Chevalier Incident Explained: It's Messier Than You Think! is Oppenheimer's Big Secret. Jun 24, 2024 The Chevalier Incident in 'Oppenheimer' is a colorful tale of falsehoods, spies, and a man who simply wanted to defend his friend. We discuss the real-life mess and how it ruined Oppenheimer's career, including the security hearing.