Basic Zombie (Plants vs. Zombies 2), Plants vs. Zombies Wiki

Basic Zombies (and their world-themed counterparts) are the most basic of the "zombie" units. Having no special defensive equipment or travel abilities, these zombies are susceptible to any type of attack and are slow to approach the player's house. They are found in most levels and are the first zombies the player encounters in every single world. The Conehead Zombie, Buckethead Zombie, Camel Zombies, Knight Zombie, Blockhead Zombie, Bug Zombie, Jurassic Fossilhead, Brickhead Zombie, Centurion

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Zombie (Plants vs. Zombies), Plants vs. Zombies Wiki

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PvZ2 in chronological order, all info was gathered by the wiki. (Apologies if it's mucked up by unspecified dates, plus nobody really knows about Sky City and Lost City's times) : r/PlantsVSZombies