The zombies only appears in the movie since they are fictitious and not real. Parents use them to scare their child to behave to be able to control them. A group of scientist have been experimenting on a disease since they are paid to create a cure on that. They are paid good money and that is enough to get motivated to pursue the research. The researchers work all day and all night to be able to accomplish something. The research was too long and now there is a new president. During that time, the president was trying to cut-cost so he ordered the researchers to finish it early. The researchers has no choice since the president has spoken. They did their best to finish it early. They know that there would be consequences because they are not given enough time. This could be fatal, but they can't do anything since it was an order from the higher seat. After lots of years, they were able to see some results and the president quickly order them to distribute it on the market. The people were happy since they can finally rid themselves of the disease, but something is wrong, they are feeling that something is going on with themselves. Soon, one after another the people that used the cure died. The relatives has no choice, but to bury them. The president order to stop production of the new drug, but it was too late since the dead has risen and now feasting on the living. Their bites are not only deadly, but could infect the other person. In just a short amount of time, their number grows in inexplicable rate. The humans were close to extinction as their numbers grew even less with the population of the zombies growing. Soon enough, there was only one city left and most of the survivors has gathered there. Most of the survivors are rich and they could afford almost anything. They have hired an elite guard to make them safe. These guys are the ones that make sure their safety. These guys are paid high since their work is the safety of the citizen. They stand in the way of zombies and make living a little enjoyable. There are many types off elite soldiers and each one of them plays a vital role in driving the undead out of the city. Each has their expertise and all of them work hand in hand to stop the zombies from advancing. In this game, you need to assign some squad to protect a certain area. Zombies would come on rush in and the idea here is to protect the area. Each zombie that you kill drop coins. You could use the money to upgrade a certain unit at a time. This is also the same money that you use to buy more soldier. The game would get even harder as you make some progress, so try to upgrade the stats of each type of soldier if you can.