Young friends Raz, Kiley and Donnell are going underground, along with everyone else aboard the asteroid station. Their home is about to pass through deadly space radiation, and they'll be safe deep inside the lower level. But soon the friends spot ghostly figures flickering in the corridors. Rooms suddenly look abandoned and run-down. Is it just a glitch in the computer's holographic system, as the adults claim, or is something more sinister stirring?