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A Sound of Thunder is a science fiction film released in 2005, and directed by Peter Hyams. The film was planned originally for a 2002 release. However, flooding in Prague (where the production was filmed) and other financial difficulties—- including the bankruptcy of the original production company during post-production—- resulted in a delayed release. A Sound of Thunder is based loosely upon the short story "A Sound of Thunder" by Ray Bradbury. The film is about "time tourists" who accidentally interfere too much with the past and thus completely alter their present.
According to the film, the established rules of time travel are:
These protocols were established, in part, by businessman Charles Hatton (Ben Kingsley) who has recently developed a time tourism service called Time Safari. For an extraordinary price, Time Safari will take clients through a wormhole to a time in pre-history to hunt dinosaur game. Scientist Travis Ryer (Edward Burns) is the designated leader for these safari expeditions, along with several other guides. Only creatures that are doomed to perish—such as dinosaurs about to die in a volcanic eruption—are downed by safari patrons. ...