The world is not what it used to be, scientists have ruined it. After we finally perfected gene splicing and mutating animals things went out of control. Most people were against it and they ended up being the first experimented on, each new species were crazier than the next, having each scientist trying to one-up the other. Then on June 21, 2035, a massive emp wave temporarily disable the world's power. This caused the new species to escape. After that everything changed.