While camping in Jasper Park up North California, the couple Tom Alan Smithee and Gwen Marie Holden are attacked by a group of strangers; Tom is immediately killed and Gwen is abducted by the men to an underground facility to breed. A couple of months later, in Los Angeles, the manager of a video game company Johnny Dash invites the employees Adam Benson, Lee, Maggie, Perry, Chris Basso, Paul and Mike Chen to participate in a 'Battle Royal' paint-ball game at a corporate retreat in the Jasper Park to practice executive tactics. When they arrive at a gas station, they refuel their trucks and see a poster saying that Gwen and Tom are missing since 30 February 2008 and have been last seen in Jasper Park. They head to a former military reservation area in the national park and camp. During the night, Adam has the sensation that the group is under observation and he unsuccessfully warns his colleagues.