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eckles and company travel back 25 million years into the past and encounter a t rex
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stunned and frightened by the t rex, eckels accadently steps off the path and tramples a butterfly
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eckles returned to the machine and is forced to retrive the bullets from the body of the t rex
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returning to the future and realiseing the changes, the other pasengers take matters into their own hands and kill eckles
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eckles arranges to go back in time to hunt a t rex by time traveling 25 million years into the past