The Flag Zombie.

Flag Zombie marks the arrival of a huge pile or 'wave' of zombies. It is very similar to the Basic Zombies, but it is much faster. You will only see two or three of them in a level, but the attacks that follow can be very dangerous, so look out!

Health: Low

Strengths: Huge wave of zombies following him, high speed

Weaknesses: Multiple shooters, explosive plants (to take out the huge wave)