A generation of moviegoers recognizes 2009's Avatar as a game changer: Hollywood's highest-grossing film of all time, and one that also made history by pushing performance-capture technology in bold new directions. But the only recollection that actress Bailey Bass, 19, has of the original is the memory of her six-year-old self in a theater. "When you're that young, it's hard to understand what's going on," she tells EW. It wasn't until she prepared to audition for the sequel, Avatar: The Way of Water, at the age of 12 that she understood the hype.