The origin of the zombie apocalypse in The Walking Dead has been a mystery for a long time, but recent developments have shed some light on the subject. According to a post-credits scene in The Walking Dead: World Beyond, the virus originated in a French laboratory where numerous teams worked on a project that ultimately became the TWD zombie origins. The facility housed teams such as Violet team and Primrose team, and since Primrose team had traveled to the U.S., it is believed that the virus was brought to America. However, it is important to note that the creator of The Walking Dead, Robert Kirkman, had originally chosen not to reveal the zombie virus origin in the comics, and he had expressed that revealing the origin would make the show "boring". Additionally, the virus is a metaphor for anything that destroys society, and the cause of the zombie apocalypse is not important to the story. Therefore, while recent developments have provided some answers, the origin of the zombie apocalypse in The Walking Dead is ultimately not the most important aspect of the story.