"Extra" was on the set of CBS show "The Big Bang Theory" with Kaley Cuoco and Emmy winning Jim Parsons -- who revealed which actor inspires him. "I've been enjoying James Franco lately. He does so many neat, interesting things."
Fellow actors Johnny Galecki and Simon Helberg opened up about the smartest cast member on the show and shared what fans might not know about their favorite geek squad. Watch and find out!