The comic Yoko Tsuno: The time spiral from 1981 (
https://fr.wikipedia.org/wiki/La_Spirale_du_temps) is about a time traveler, who arrives from the future to prevent the creation/invention of antimatter. This is important, because in a future world war an antimatter bomb destroyed the earth.
The fact that no time traveler is mentioned in the article is probably a good sign for our future.