Are you ready for a post-apocalyptic world filled with aliens and humans fighting to share the same home? Defiance, premiering on the Syfy network on April 15, is a new series that explores a transformed Earth after it is invaded by a variety of otherwordly beings. Julie Benz plays the take-charge Mayor of Defiance (formerly known as St. Louis), and it's anything but a cushy job. "It’s not like I’m the mayor of Los Angeles here -- it’s a frontier town, a rough town, and a whole new world. You have to protect yourself,” Benz told XFinityTV. “I respond to these characters with a deeper mythology -- I could easily go play a wife or mother -- but to play a powerful woman, you’re not going to find that much in mainstream television. You have to look to genre material." Will the aliens and humans play nice? Look for plenty of action and adventure to come!