If you have ever experienced the feeling of watching your base being attacked by a zombie horde, you can relate to what Dr A18 and his team are going through. But what you might not know is that the situation is much, much worse than what you have ever seen. And the reason is that the zombie’s attack strategy has changed and is now more focused on the military than the former zombie strategy. They have become more armored, more dangerous, and are even able to take down some of the most powerful weapons in the world. The only way to survive this new attack is to develop new weapons and upgrade the old ones.