The year is 2055. A hunter known simply as "Eckels" prepares to take the trip of a lifetime: going back in time to the Mesozoic to hunt the [[StockDinosaurs greatest predators]] that ever lived. However, when he goes back to the Late Cretaceous he panics when confronted with a ''TyrannosaurusRex'', and falls off the path and crushes a butterfly, breaking some of the myriad of rules the time agency has to keep the time line from changing. When the party returns to the future, they find out that the world has changed for the worse. In the original timeline, the [[OurPresidentsAreDifferent United States presidential election]] was recently won by Keith, a fairly moderate candidate, as opposed to [[GratuitousGerman Deutscher]], a [[DoesThisRemindYouOfAnything fascist extremist]]. However, in this changed timeline, the reverse is true ([[MyNaymeIs words and phrases are also spelled differently]]). A distraught Eckels pleads with Travis, the guide, to take him back in time and fix what he's done, but Travis, having previously warned him that it's impossible (the time machine skips over any moment in history that they've already visited), silently lifts and fires his rifle, presumably at Eckels.

First written by Creator/RayBradbury as a short story for ''Collier's'' magazine in 1952, "A Sound of Thunder" has become the most republished science-fiction story of all time. Its influence can be seen all over the fictional world, particularly due to its [[TropeCodifier introduction of]] the TimeTravel plot in which "[[ButterflyOfDoom small changes in the past snowball into the future]]". It is one of the TropeNamers for ButterflyOfDoom, which is... well, exactly what it stated above. This story has also led to the creation of numerous other works, including a spin-off novel series and the short story series ''Rivers of Time''. Oh, and a movie, released by Creator/WarnerBros in 2005, starring Edward Burns, Creator/BenKingsley and Catherine [=McCormack=], and directed by Peter Hyams. But [[http://www.agonybooth.com/recaps/A_Sound_of_Thunder_2005.aspx someone else]] can walk you through that better than we can.

[[http://www.scaryforkids.com/a-sound-of-thunder/ This page has some nice illustrations.]]
----
!!The short story contains examples of:
* AsYouKnow
* ButterflyOfDoom: The {{Trope Namer|s}}
* CloseEnoughTimeline: Travis actually theorizes about this before the hunt began.
* ForWantOfANail
* GodwinsLawOfTimeTravel: The UrExample, although Deutscher is only Nazi-like rather than full-on Nazi.
* InSpiteOfANail
* RippleEffectProofMemory
* ScienceMarchesOn: Numerous facts about dinosaur biology, particularly about them having two brains.
* StayOnThePath
* StockDinosaurs: The only dinosaur that appears in the entire story is the infamous ''TyrannosaurusRex''.
* TemporalParadox: Subverted when the safari guides explain that "Time steps aside" to prevent such paradoxes from happening.
* TimeTravelForFunAndProfit: Travis' agency organises safaris into the past for big game hunters.
* TitleDrop: Twice in the narration.
* TyrannosaurusRex
* WhatCouldPossiblyGoWrong: Who thought it was a good idea to make big-game time travelling, knowing full well what the risks and consequences were? What sort of monetary gain could be worth the risk of waking up one morning to [[RetGone have never existed]]?
** Simple: ScrewTheRulesIHaveMoney
----
!!The spin-off novel series contains examples of:
* AbusiveAlienParents: The Mutata send their young off to be raised by other Mutata.
* AlwaysChaoticEvil: The sentient Allosaurs.
* RuleOfCool: Alternate universes filled with [[EverythingsBetterWithDinosaurs dinosaurs]], samurai, sapient pterodactyls, cyborgs, and [[ModernMayincatecEmpire Aztecs]]. At one point it is hinted that there is even an entire universe filled with [[CatGirl cat people]].
----
!!The movie contains examples of:
* AdaptationExpansion: Turning a short story into a feature film might be a good cause for the awfulness.
* ArtisticLicenseBiology: Where do we ''start''!
** [[{{Whateversaurus}} Baboonasaurs]], that's where. Alternately "Baboonizards." There's also the flying "Batboonizards," and "miscellaneous underwater shark-eel-thing."
** And we continue with the claim that lions are descended from Allosaurs. Congratulations.
** The claim that humans were "the last species to evolve." That's... nowhere NEAR how evolution works.
* DelayedRippleEffect: Taken to ridiculous extremes. Translucent blasts called ''timewaves'' come out of nowhere and start knocking people around. And each time they do more species become "devolved".
* DullSurprise: [[http://www.agonybooth.com/recaps/A_Sound_of_Thunder_2005.aspx "Pierce Brosnan was originally slated to star. Unfortunately, he was replaced by a wooden marionette that looks a lot like Edward Burns."]] (It's a running gag on the recap seeing how his facial expressions are the same for most of the film.)
* MoneyDearBoy: Ben Kingsley.
* SexyManInstantHarem: Ryer bangs a client.
* ShoutOut: Haddon kiss-assingly compares his clients to "[[FamousFamousFictional Columbus discovering America. Armstrong stepping on the moon. Brubaker landing on Mars]]". The latter is a reference to ''Film/CapricornOne'', Hyams' debut film, where Brubaker was the captain of a faked Mars landing.
* {{Tagline}}: "Evolve or die" and "Some rules should never be broken".
* VoodooShark: Apparently the reason big-game hunters are so eager to go back in time to hunt dinosaurs is because... wait for it... ''all animals are extinct'' in 2055. This is mentioned in one scene and then never referenced again, and doesn't explain why people wouldn't be willing to pay to use time travel for more peaceful sightseeing purposes.
* YouGetWhatYouPayFor: The boss of the safari company shutting down a key component of the time machine to save power contributed to the catastrophe at hand.
----