Following the official IMAX poster released yesterday, Walt Disney Pictures has debuted four character posters for their upcoming adventure Tomorrowland. George Clooney (Frank Walker), Britt Robertson (Casey Newton), Raffey Cassidy (Athena) and Thomas Robinson (Young Frank Walker) are featured in these new one-sheets for director Brad Bird's upcoming adventure. We don't know much about Athena and Young Frank Walker quite yet, but hopefully we'll find out more about these characters as we get closer to the May 22 release date.From Disney comes two-time Oscar winner Brad Bird's riveting, mystery adventure Tomorrowland, starring Academy Award winner George Clooney.