Not much more needs to be said other than this is a summer flick, a time-traveling adventure, very loosely based on a Ray Bradbury story. The setting is 2055 Chicago, where folks with deep pockets get the opportunity to run with (okay, hunt) the dinosaurs, courtesy of a greedy entrepreneur (Kingsley). A snafu threatens to change the future, reverting Chicago (and the rest of the planet) back to prehistoric times. Loads and loads of special effects and, well, that's about it. "The Simpsons" fleshed out this premise with more success a few years ago.