Christopher Nolan and Universal Pictures brought a 5-minute exclusive featurette of "Oppenheimer" to CinemaCon in Las Vegas, and this movie looks like it's going to be Nolan's true masterpiece.<br /><br />Watch CinemaBlend's Sean O'Connell break down what he saw, and if the new footage changed his mind about which feature he'll be seeing first on July 21: Greta Gerwig's "Barbie" or "Oppenheimer."<br /><br />Based on the true story, "Oppenheimer" follows physicist J. Robert Oppenheimer as he works with a team of scientists during the Manhattan Project, leading to the development of the atomic bomb. "Oppenheimer" stars Cillian Murphy, Matt Damon, Emily Blunt and Robert Downey Jr.
