After a bank job goes badly wrong, three desperate criminals take a young woman and a father and child hostage - it's the beginning of a frantic and violent road trip that not all of them will survive.

A group of humans arrive on Sirius 6-B to investigate an SOS signal sent out from the planet, which has been supposedly deserted since the destruction of the man-made weapons known as "screamers." Once the squad arrives, they find...