After 200 years of being quarantined by the United Planets for their unpredictability, Earth is contacted to help defeat a dangerous new alien threat invader that no other species can stop - the warmongering Zalek. Desperate alien leaders strike a dangerous bargain to unleash humankind's frightening military abilities contained for two centuries. Now Earth's advanced weaponry and ships of unimaginable power are all that stand between survival and annihilation across the stars.