Chris Hemsworth is a busy man. In addition to being the Marvel movie universe's Thor, the Australian actor has been promoting the upcoming Ron Howard drama 'Rush,' which sees him stepping into the role of Formula One racer James Hunt. However, no interview with Mr. Hemsworth could be complete without asking him about 'The Avengers: Age of Ultron,' but the God of Thunder himself can't spill any details. After all, he doesn't even have any details to spill. He doesn't even know who Ultron is!