The Zombies are the monsters that only come out at night! There are many varieties with different abilities so you'll need to have a broad strategy to be able to defeat them all. They become more powerful over the nights, amassing larger hordes.
These infected blighters are the antagonist of Survival City and they will not rest until you've been chomped!
Check out the in-game wiki to learn more about them. Every zombie has strengths and weaknesses. Some weapons work better than others against certain zombies so you should know about that if you want to stay alive!