A Sound of Thunder is a 2005 science fiction film

Science fiction film

Science fiction film is a film genre that uses science fiction: speculative, science-based depictions of phenomena that are not necessarily accepted by mainstream science, such as extraterrestrial life forms, alien worlds, extrasensory perception, and time travel, often along with futuristic...

 directed by Peter Hyams

Peter Hyams

Peter Hyams is an American screenwriter, director and cinematographer, probably best known for directing the 1984 science fiction adventure 2010 , Capricorn One, the comic book adaptation Timecop and the Arnold Schwarzenegger horror/action film End of Days.-Family:Hyams was born in New York...

. The film was planned originally for a 2002 release. However, flooding in Prague

Prague

Prague is the capital and largest city of the Czech Republic. Situated in the north-west of the country on the Vltava river, the city is home to about 1.3 million people, while its metropolitan area is estimated to have a population of over 2.3 million...

 (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 on the short story "A Sound of Thunder

A Sound of Thunder

“A Sound of Thunder” is a science fiction short story by Ray Bradbury, first published in Collier’s magazine in 1952. As of 1984 it was the most re-published science fiction story up to the present time...

" by Ray Bradbury

Ray Bradbury

Ray Douglas Bradbury is an American fantasy, horror, science fiction, and mystery writer. Best known for his dystopian novel Fahrenheit 451 and for the science fiction stories gathered together as The Martian Chronicles and The Illustrated Man , Bradbury is one of the most celebrated among 20th...

. The film is about "time tourists

Time travel

Time travel is the concept of moving between different points in time in a manner analogous to moving between different points in space. Time travel could hypothetically involve moving backward in time to a moment earlier than the starting point, or forward to the future of that point without the...

" who accidentally interfere too much with the past, completely altering the present.
In the near future time-travel (referred to as "time-jumping") is possible, but is considered very dangerous and unpredictable.