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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
He appeared again in a flashback in Walking Dead: World Beyond's final episode where more details were revealed about what might have caused the outbreak.
The Walking Dead: World Beyond's series finale does, however, strongly imply that variant zombies were accidentally created by the same scientists responsible for the original virus - a deeply unfortunate consequence of searching for a cure.
Source: https://screenrant.com/walking-dead-zombie-variants-good-make-no-sense/