A greedy businessman uses a time machine to organise prehistoric safaris, offering wealthy clients the chance to hunt dinosaurs. But when one of his customers accidentally kills an insect, the entire history of evolution is rewritten as a consequence, and the expedition returns to its own time to find the world over-run with strange creatures. Sci-fi adventure, based loosely on Ray Bradbury's short story, starring Ben Kingsley, Catherine McCormack and Edward Burns