The Walking Dead's zombie variants have not been explained and it's best if they remain a mystery. These unique walkers were unintentionally included in the show and their absence in spinoffs is strange. While theories suggest the variants may have originated from France, it doesn't add up with the show's timeline. It's better to leave the variants unexplained, as trying to provide an explanation would raise more questions. The mystery of the variants can replace the franchise's oldest question of the zombie virus's origin.