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The zombies ate your brains!
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Primitive Snail Zombie is a zombie which is a boss in Plants vs. Zombies: All Stars that is encountered in Prehistoric Ages. He is an Imp riding a snail, which is presumably also a zombie. He has five stages of health and takes four turns to activate his Boss Skill, which is dealing damage to all plants on screen.
Primitive Snail Zombie resembles the Jurassic Imp riding on top of a giant snail, albeit with hair and different garments. The fact that the snail is so large references how animals were much larger in prehistoric times.