After a rare comet sighting, teen sisters Regina (Catherine Mary Stewart) and Samantha (Kelli Maroney) find that they’re among the only survivors of a zombie attack. The girls partner with another survivor, Hector (Robert Beltran), but as they try to avoid the zombies, they’re sought by scientists who want to experiment on their bodies in the hope of finding an antidote. Dodging both the doctors and the undead, they keep moving in the hope that they can continue to stay alive.