 In 1999, Moonbase Alpha is set up to act not only as a research center, but as an early warning station in case of alien attack. Its commanded by Americans Commander John Koening and Doctor Helena Russell. Also at this time, Earth has decided to ship all of its nuclear waste to the Moon. Unfortunately, on September 13th, just as a deep space probe is to be launched, a chain reaction causes the waste to explode, causing the moon to be ripped from its orbit and sent hurtling out of the solar system. Now, the crew must struggle for survival as they go further and further out in space.