User blog comment:A Graalian/Who would you rate the hardest Zombie in PvZ2 and OP plant in PvZ2?/@comment-11469501-20150409001146

Zombie - Zombie King - He supports every single Peasant Zombie. He also has quite a lot of hitpoints.

Plant - Infi-nut - It has less hitpoints than a Wall-nut, but can recharge back if not for those Explorer Zombies.