Dr. Steven Sorenson plans to tap the geothermal energy of the Earth's interior by means of a thermonuclear device detonated deep within the Earth. Despite dire warnings by fellow scientist Ted Rampian, Dr Sorenson proceeds with the experiment after secretly learning that he is terminally ill. This experiment causes a crack to form and grow within the earth's crust, which threatens to split the earth in two if it is not stopped in time.
A group of siblings go to their family cabin after over a decade for a hunting trip to reconnect, only to find themselves being hunted by a terrifying alien creature. Now they must team up and become the hunters before becoming the hunted.