When the outbreak first occurred, Jess and Zac were living life as normal. But when a flu like virus quickly racks up a few thousand deaths, it soon becomes a national pandemic. Scientists are scrambling to come up with a cure. Overnight, the pandemic turns into all out hell, as the world is suddenly swarmed with flesh eating monsters. Jess and Zac soon find themselves battling the beasts to stay alive and help recover a possible cure to save the world.