A Sound of Thunder (2005)

The events of 2055 made people horrified, because it turned out that they could influence the past by changing the course of history. Now it is possible to travel in time, but the researchers realized that staying in the prehistoric era, nothing can be reversed here, otherwise danger will happen. It is also impossible to forget your own personal hygiene items or scientific research, because in the future you can change the future beyond recognition, and it will be impossible to fix this.

Heading to the designated area, the guys rejoiced and enjoyed the wildlife, examined everything around, and studied for scientific progress. But they complied with the rules and laws. It turned out that among them was a person who specifically refers to all the requirements of the expedition group. Having decided to harm an ordinary butterfly, he did not suspect that, returning to their normal time, new creatures and natural phenomena would appear. Cataclysms do not contribute to the survival of mankind. Everything has changed a lot. The guys here don't understand why this happened at all.