Scarlett Johansson Reveals What Convinced Her to Join the Marvel Universe

One film in particular made Scarlett Johansson want to join the Marvel universe! The 35-year-old actress, who portrayed Black Widow, says she knew she wanted to be a part of the franchise after watching Iron Man. PHOTOS: Check out the latest pics of Scarlett Johansson "I just loved it. I'd never really seen anything like