A seemingly insignificant act may cause the fabric of history to unravel in this sci-fi adventure. Charles Hatton (Ben Kingsley) owns and operates a successful firm known as Time Safari. Thanks to time travel technology developed by Hatton's employee Sonia Rand (Catherine McCormack), Time Safari allows big game hunters to journey back to prehistoric days and shoot living, breathing dinosaurs. Rand picks out the dinosaur in question, who is soon to die, and creates a floating walkway for the hunters, so the impact of their presence will not be felt by the land around them. But on one expedition, things go horribly wrong when a nervous hunter steps off the walkway and crushes a butterfly, a tiny act that proves to have massive consequences over the course of several million years. As the earth's climate and animal life begin to mutate due to this shift in natural history, Time Safari's leading hunting guide, Travis Ryer (Edward Burns), works beside Rand in a desperate attempt to halt the "ripples of time" before modern civilization completely collapses. A Sound of Thunder was based on a classic short story by pioneering science fiction author Ray Bradbury.