However well people live, some always want to live better. Such people are willing to do anything, even to destroy other people for their own benefit. It is because of this, they created a secret "dark" lab where scientists are trying to create a virus that will transform all life into mutants. Unfortunately, they succeeded, and the dark times came. Only 20% of humanity could be saved thanks to she who invented "life." She saved them from infection ... But, nevertheless, the survivors have to hide in their fortresses / bases and defend against the mutants.