The summer's hottest reality competition show, "America's Got Talent," returns with creator and executive producer Simon Cowell joining the judges table alongside Heidi Klum, Mel B, Howie Mandel and host, Nick Cannon. In the season premiere, variety acts of all types and contestants of all ages audition for the chance to win the $1 million prize. The Golden Buzzer is back and allows four lucky acts the chance to go directly to the live performance rounds at the Dolby Theatre in Los Angeles to compete for America's vote.