After her last encounter, Ellen Ripley crash-lands on Fiorina 161, a maximum security prison. When a series of strange and deadly events occur shortly after her arrival, Ripley realizes that she has brought along an unwelcome visitor.

When a group of strangers at a dusty roadside diner come under attack by demonic forces, their only chance for survival lies with an archangel named Michael, who informs a pregnant waitress that her unborn child is humanity’s last hope.