A small town supermarket serves as the setting for this suspenseful sci-fi thriller about a malevolent alien seeking to take over the human race. Nothing unusual ever happens at Hastings Market, so when a heavily armed gang enters the store guns blazing at closing time, the terrified shoppers and employees at first assume they're the victims of a violent armed robbery. But appearances can be deceptive, as they're about to find out. Something inhuman has gotten loose inside Hastings Market - something that, if allowed to escape, could bring about the downfall of humanity. Now, as the police surround the building, a mysterious man begins scanning everyone inside in an attempt to root out the alien invader. Within one of these people dwells an extraterrestrial with the power to claim our planet as its own. But the worst is yet to come, because when an off-duty cop attempts to play hero, he inadvertently destroys any chance of determining which one of the hostages is serving as host to the alien. Now, the only way ensure the survival of our species is to kill everyone in sight, or die trying.