Double pawn with Raptor Zombie... This shows Valve's latest game product Left4Dead inspiration i guess!
As a Human, your HP would be around 150 and the zombies have 10 times more your health but your ammos are nearly unlimited! What you do is headshot them in every techniques you have!
Zombie Plague mode is specialized in normal maps and the textures would changed into some nightime atmosphere to suit the mod's gameplay.