Elon Musk chats with ET's Deidre Behar in Los Angeles at the 10th Breakthrough Prize Awards, a ceremony that recognizes scientific achievement and brings together luminaries of science and mathematics with leading figures from the worlds of entertainment. The entrepreneur opens up about who he'd like to see play him in the upcoming biopic about his life, directed by Darren Aronofsky. Plus, Elon reveals he's had discussions with Tom Cruise about the idea of filming the next 'Mission: Impossible' movie in space.