Want to be a superhero? Actor Joseph Mazzello, 14, who starred in Jurassic Park, can tell you what it's like. Now he plays Spencer Griffith in the movie Star Kid, which opens January 16. Spencer climbs inside Cy, a seven-foot-tall alien, and controls his superpowers. Special effects make the action look real, but "it wasn't really that exciting," Joseph told TFK. "I just sat on a stool."