Un grupo de infantes de marina responde a una llamada de socorro desde una base científica de alto secreto en Fobos, pero descubren que ha sido invadida por demonios que buscan crear el Infierno en la Tierra.

The International Space Station is now a prison - the ultimate black site. No one's getting out. And no one knows it's there. But when the imprisoned terrorists take over the Station and turn it into a missile aimed at Moscow, only a shuttle pilot and a rookie doctor can stop them. Their task is complicated by a rogue CIA agent (Scott Adkins) who has his own plans for the station and the terrorists within.