Six Flags Elitch Gardens opens for an exciting season of revamped family fun and new entertainment as Six Flags celebrates its 45th anniversary. Justice League, featuring the DC Comics Super Heroes Batman, Robin, Wonder Woman, Green Lantern and The Flash will arrive in the Mile High City in grand fashion. Arriving through air, these super heroes will watch over the grand opening ceremonies and protect Coloradoans from a mundane summer. Park guests will then be treated to birthday cake following the inaugural 45th Anniversary Celebration Parade.