AglobalsteelworkscompanypartnerswithanaerospacefirmtominetheMoon.　　However,whenadrillingaccidentcausesagiantpieceoftheMoontocrackoffandhurtletowardsEarth,thesurvivingspaceteamandtheheadofthefirmmustfigureouthowtodestroythemeteoroidbeforeitwipesouttheentireplanetaaa