They're stuck in an underground facility after waking up from a cryogenic hibernation in a group of five scientists. Without knowing who they are, or how long it has taken them to fall asleep, they begin to suspect that their slumber was a misguided attempt to conduct scientific research. After a sequence of unexplained incidents, the scientists find themselves being pursued by a mysterious force. No one knows why they are being targeted, but the scientists begin to believe that one of them is the assassin.