Board Thread:Plants vs. Zombies Wiki Discussion/@comment-6593079-20130226234600/@comment-5079138-20130402131521

I think Gatling Pea Zombie. Because

1. It shoots 4 peas. a normal plants without defensive plants protection can instantly die in 16 shots

2. Damages Wall-nut, Tall-nut and Squash quickly.

3. Kills instant kills such as Squashes and mushroom instant kills (when sleeping)

and Zomboni. It can't be frozen (even with Ice-shroom) and can crush pumpkined plants due to pumpkins are large. In bobsled bonanza is the most annoying one as the ice trail won't go away until you plant jalapeno.